Lessons

Basics

54

Hello Python World

Learn to print your first message in Python

Variables and Numbers

Store and use numbers in variables

Simple Math Operations in Python

Learn how to perform basic math operations using Python.

String Fun

Work with text in Python

Print Multiple Lines

Learn to print multiple messages

Numbers and Math

Work with different numbers

Subtraction Fun

Practice subtraction in Python

Multiplication Magic

Multiply numbers together

Division Basics

Divide numbers in Python

Comments in Code

Add comments to explain code

Variable Names

Learn good variable naming

Number Comparison

Compare numbers with operators

Boolean Values

Work with True and False

Multiple Variables

Create several variables at once

Modulo Operator

Find remainders with modulo

Power Operator

Learn how to use the power operator (**) to calculate exponents in Python.

Integer Division

Divide without decimals

Greet Ada

Print exactly: Hi Ada, welcome to Python!

Negative Indexing

Access items from the end

Type Conversion - String to Int

Convert text to numbers

Type Conversion - Int to String

Convert numbers to text

Is 14 even or odd?

Print 'even' if 14 is even, else 'odd'.

Absolute Value

Get positive version of numbers

Round Function

Round decimal numbers

Logical AND

Combine conditions with AND

Is 14 greater than 3?

Print whether 14 > 3 (True or False).

Logical OR

Combine conditions with OR

Logical NOT

Invert boolean values

In Operator

Check if item exists

Using the "not in" Operator

Check if an item does not exist in a list or string using the "not in" operator.

Identity Operator

Check if variables are same object

Add 3 to the text "14"

14 is a string. Convert it to a number, add 3, print the result.

Remainder of 14 ÷ 3

Print the remainder of 14 divided by 3 using %.

Greet Sam

Print exactly: Hi Sam, welcome to coding!

Is 7 even or odd?

Print 'even' if 7 is even, else 'odd'.

Is 7 greater than 5?

Print whether 7 > 5 (True or False).

Add 5 to the text "7"

7 is a string. Convert it to a number, add 5, print the result.

Remainder of 7 ÷ 5

Print the remainder of 7 divided by 5 using %.

Greet Mia

Print exactly: Hi Mia, welcome to Python!

Is 40 even or odd?

Print 'even' if 40 is even, else 'odd'.

Is 40 greater than 6?

Print whether 40 > 6 (True or False).

Add 6 to the text "40"

40 is a string. Convert it to a number, add 6, print the result.

Remainder of 40 ÷ 6

Print the remainder of 40 divided by 6 using %.

Greet Leo

Print exactly: Hi Leo, welcome to programming!

Is 42 even or odd?

Print 'even' if 42 is even, else 'odd'.

Is 42 greater than 8?

Print whether 42 > 8 (True or False).

Add 8 to the text "42"

42 is a string. Convert it to a number, add 8, print the result.

Remainder of 42 ÷ 8

Print the remainder of 42 divided by 8 using %.

Greet Noa

Print exactly: Hi Noa, welcome to Python!

Is 100 even or odd?

Print 'even' if 100 is even, else 'odd'.

Is 100 greater than 7?

Print whether 100 > 7 (True or False).

Add 7 to the text "100"

100 is a string. Convert it to a number, add 7, print the result.

Remainder of 100 ÷ 7

Print the remainder of 100 divided by 7 using %.

Greet Eli

Print exactly: Hi Eli, welcome to coding!

Control Flow

58

If Statements

Make decisions in your code

Loops - For

Repeat code multiple times

If-Else Statement

Handle both true and false cases

Elif Statement

Check multiple conditions

While Loop

Repeat code while condition is true

For Loop with Range

Loop through a range of numbers

Using 'break' in Loops

Learn how to use the 'break' statement to exit loops prematurely.

Continue Statement

Skip to next loop iteration

FizzBuzz to 15

For 1..15: print Fizz (÷3), Buzz (÷5), FizzBuzz (both), else the number.

Letter grade for 85

A score of 85: print 'A' (>=90), 'B' (>=80), 'C' (>=70), else 'F'.

Is 2024 a leap year?

Print True if 2024 is a leap year (divisible by 4 and not by 100, or by 400).

Sign of 7

Print 'positive', 'negative' or 'zero' for 7.

Larger of 9 and 4 without max()

Without using max(), print the larger of 9 and 4 using an if.

Age group of 16

For age 16 print 'child' (<13), 'teen' (13-19) or 'adult' (>=20).

FizzBuzz to 20

For 1..20: print Fizz (÷3), Buzz (÷5), FizzBuzz (both), else the number.

Letter grade for 72

A score of 72: print 'A' (>=90), 'B' (>=80), 'C' (>=70), else 'F'.

Is 1900 a leap year?

Print True if 1900 is a leap year (divisible by 4 and not by 100, or by 400).

Sign of -3

Print 'positive', 'negative' or 'zero' for -3.

Larger of 12 and 5 without max()

Without using max(), print the larger of 12 and 5 using an if.

Age group of 11

For age 11 print 'child' (<13), 'teen' (13-19) or 'adult' (>=20).

FizzBuzz to 30

For 1..30: print Fizz (÷3), Buzz (÷5), FizzBuzz (both), else the number.

Letter grade for 68

A score of 68: print 'A' (>=90), 'B' (>=80), 'C' (>=70), else 'F'.

Is 2000 a leap year?

Print True if 2000 is a leap year (divisible by 4 and not by 100, or by 400).

Sign of 0

Print 'positive', 'negative' or 'zero' for 0.

Larger of 3 and 8 without max()

Without using max(), print the larger of 3 and 8 using an if.

Age group of 25

For age 25 print 'child' (<13), 'teen' (13-19) or 'adult' (>=20).

FizzBuzz to 12

For 1..12: print Fizz (÷3), Buzz (÷5), FizzBuzz (both), else the number.

Letter grade for 91

A score of 91: print 'A' (>=90), 'B' (>=80), 'C' (>=70), else 'F'.

Is 2023 a leap year?

Print True if 2023 is a leap year (divisible by 4 and not by 100, or by 400).

Sign of -10

Print 'positive', 'negative' or 'zero' for -10.

Larger of 20 and 20 without max()

Without using max(), print the larger of 20 and 20 using an if.

Age group of 19

For age 19 print 'child' (<13), 'teen' (13-19) or 'adult' (>=20).

FizzBuzz to 18

For 1..18: print Fizz (÷3), Buzz (÷5), FizzBuzz (both), else the number.

Letter grade for 59

A score of 59: print 'A' (>=90), 'B' (>=80), 'C' (>=70), else 'F'.

Is 2100 a leap year?

Print True if 2100 is a leap year (divisible by 4 and not by 100, or by 400).

Sign of 5

Print 'positive', 'negative' or 'zero' for 5.

Larger of 1 and 2 without max()

Without using max(), print the larger of 1 and 2 using an if.

Age group of 13

For age 13 print 'child' (<13), 'teen' (13-19) or 'adult' (>=20).

FizzBuzz to 25

For 1..25: print Fizz (÷3), Buzz (÷5), FizzBuzz (both), else the number.

Letter grade for 77

A score of 77: print 'A' (>=90), 'B' (>=80), 'C' (>=70), else 'F'.

Is 1996 a leap year?

Print True if 1996 is a leap year (divisible by 4 and not by 100, or by 400).

Sign of -1

Print 'positive', 'negative' or 'zero' for -1.

Larger of 15 and 30 without max()

Without using max(), print the larger of 15 and 30 using an if.

Age group of 7

For age 7 print 'child' (<13), 'teen' (13-19) or 'adult' (>=20).

FizzBuzz to 10

For 1..10: print Fizz (÷3), Buzz (÷5), FizzBuzz (both), else the number.

Letter grade for 100

A score of 100: print 'A' (>=90), 'B' (>=80), 'C' (>=70), else 'F'.

Is 2400 a leap year?

Print True if 2400 is a leap year (divisible by 4 and not by 100, or by 400).

Sign of 42

Print 'positive', 'negative' or 'zero' for 42.

Larger of 8 and 8 without max()

Without using max(), print the larger of 8 and 8 using an if.

Age group of 45

For age 45 print 'child' (<13), 'teen' (13-19) or 'adult' (>=20).

FizzBuzz to 50

For 1..50: print Fizz (÷3), Buzz (÷5), FizzBuzz (both), else the number.

Letter grade for 64

A score of 64: print 'A' (>=90), 'B' (>=80), 'C' (>=70), else 'F'.

Is 1999 a leap year?

Print True if 1999 is a leap year (divisible by 4 and not by 100, or by 400).

Sign of -7

Print 'positive', 'negative' or 'zero' for -7.

Larger of 6 and 11 without max()

Without using max(), print the larger of 6 and 11 using an if.

Age group of 20

For age 20 print 'child' (<13), 'teen' (13-19) or 'adult' (>=20).

FizzBuzz to 22

For 1..22: print Fizz (÷3), Buzz (÷5), FizzBuzz (both), else the number.

Letter grade for 92

A score of 92: print 'A' (>=90), 'B' (>=80), 'C' (>=70), else 'F'.

Data Structures

62

Lists - Collections of Items 📋

Store multiple items in a list

Data Structures

List Creation

Create and print a list

Data Structures

List Indexing

Access list items by position

Data Structures

List Append

Add items to a list using append

Data Structures

List Iteration

Loop through list items

Data Structures

Dictionary Basics

Store key-value pairs

Data Structures

List Slicing

Extract portions of lists

Data Structures

Tuple Basics

Work with immutable sequences

Data Structures

Set Basics

Work with unique collections

Data Structures

List Remove

Remove items from lists

Data Structures

Dictionary Update

Add or change dictionary values

Data Structures

Nested Lists

Work with lists inside lists

Data Structures

Word counts in a 3-item list

Count each item in ['red', 'blue', 'red'] into a dict and print it.

Data Structures

Sort [3, 1, 2, 1]

Print [3, 1, 2, 1] sorted in ascending order.

Data Structures

Unique values of [3, 1, 2, 1]

Print the unique values of [3, 1, 2, 1], sorted (use a set).

Data Structures

Common items of two lists

Print the sorted values present in BOTH [3, 1, 2, 1] and [2, 3, 4].

Data Structures

Highest value's key

In the dict {'a': 3, 'b': 7}, print the key with the largest value.

Data Structures

Unpack a tuple (5, 9)

Unpack (5, 9) into x and y, then print their sum.

Data Structures

Sum a list of 4

Print the sum of all numbers in [3, 1, 2, 1].

Data Structures

Word counts in a 4-item list

Count each item in ['x', 'y', 'x', 'z'] into a dict and print it.

Data Structures

Sort [8, 4, 8]

Print [8, 4, 8] sorted in ascending order.

Data Structures

Unique values of [8, 4, 8]

Print the unique values of [8, 4, 8], sorted (use a set).

Data Structures

Common items of two lists (['x', 'y', 'x', 'z'])

Print the sorted values present in BOTH [8, 4, 8] and [4, 9, 1].

Data Structures

Highest value's key (['x', 'y', 'x', 'z'])

In the dict {'p': 10, 'q': 2}, print the key with the largest value.

Data Structures

Unpack a tuple (2, 6)

Unpack (2, 6) into x and y, then print their sum.

Data Structures

Sum a list of 3

Print the sum of all numbers in [8, 4, 8].

Data Structures

Word counts in a 3-item list (['cat', 'dog', 'cat'])

Count each item in ['cat', 'dog', 'cat'] into a dict and print it.

Data Structures

Sort [5, 5, 1, 2]

Print [5, 5, 1, 2] sorted in ascending order.

Data Structures

Unique values of [5, 5, 1, 2]

Print the unique values of [5, 5, 1, 2], sorted (use a set).

Data Structures

Common items of two lists (['cat', 'dog', 'cat'])

Print the sorted values present in BOTH [5, 5, 1, 2] and [5, 2, 7].

Data Structures

Highest value's key (['cat', 'dog', 'cat'])

In the dict {'m': 1, 'n': 9}, print the key with the largest value.

Data Structures

Unpack a tuple (11, 4)

Unpack (11, 4) into x and y, then print their sum.

Data Structures

Sum a list of 4 (['cat', 'dog', 'cat'])

Print the sum of all numbers in [5, 5, 1, 2].

Data Structures

Word counts in a 3-item list (['a', 'b', 'c'])

Count each item in ['a', 'b', 'c'] into a dict and print it.

Data Structures

Sort [9, 3, 6]

Print [9, 3, 6] sorted in ascending order.

Data Structures

Unique values of [9, 3, 6]

Print the unique values of [9, 3, 6], sorted (use a set).

Data Structures

Common items of two lists (['a', 'b', 'c'])

Print the sorted values present in BOTH [9, 3, 6] and [6, 1, 3].

Data Structures

Highest value's key (['a', 'b', 'c'])

In the dict {'k': 4, 'j': 8}, print the key with the largest value.

Data Structures

Unpack a tuple (7, 7)

Unpack (7, 7) into x and y, then print their sum.

Data Structures

Sum a list of 3 (['a', 'b', 'c'])

Print the sum of all numbers in [9, 3, 6].

Data Structures

Word counts in a 3-item list (['up', 'up', 'down'])

Count each item in ['up', 'up', 'down'] into a dict and print it.

Data Structures

Sort [2, 2, 2, 5]

Print [2, 2, 2, 5] sorted in ascending order.

Data Structures

Unique values of [2, 2, 2, 5]

Print the unique values of [2, 2, 2, 5], sorted (use a set).

Data Structures

Common items of two lists (['up', 'up', 'down'])

Print the sorted values present in BOTH [2, 2, 2, 5] and [5, 8, 2].

Data Structures

Highest value's key (['up', 'up', 'down'])

In the dict {'s': 6, 't': 6}, print the key with the largest value.

Data Structures

Unpack a tuple (3, 12)

Unpack (3, 12) into x and y, then print their sum.

Data Structures

Sum a list of 4 (['up', 'up', 'down'])

Print the sum of all numbers in [2, 2, 2, 5].

Data Structures

Sort [4, 2, 3, 2]

Print [4, 2, 3, 2] sorted in ascending order.

Data Structures

Unique values of [4, 2, 3, 2]

Print the unique values of [4, 2, 3, 2], sorted (use a set).

Data Structures

Common items of two lists (['red', 'blue', 'red'])

Print the sorted values present in BOTH [4, 2, 3, 2] and [3, 4, 5].

Data Structures

Sum a list of 4 (['red', 'blue', 'red'])

Print the sum of all numbers in [4, 2, 3, 2].

Data Structures

Sort [9, 5, 9]

Print [9, 5, 9] sorted in ascending order.

Data Structures

Unique values of [9, 5, 9]

Print the unique values of [9, 5, 9], sorted (use a set).

Data Structures

Common items of two lists (['x', 'y', 'x', 'z']·2)

Print the sorted values present in BOTH [9, 5, 9] and [5, 10, 2].

Data Structures

Sum a list of 3 (['x', 'y', 'x', 'z'])

Print the sum of all numbers in [9, 5, 9].

Data Structures

Sort [6, 6, 2, 3]

Print [6, 6, 2, 3] sorted in ascending order.

Data Structures

Unique values of [6, 6, 2, 3]

Print the unique values of [6, 6, 2, 3], sorted (use a set).

Data Structures

Common items of two lists (['cat', 'dog', 'cat']·2)

Print the sorted values present in BOTH [6, 6, 2, 3] and [6, 3, 8].

Data Structures

Sum a list of 4 (['cat', 'dog', 'cat']·2)

Print the sum of all numbers in [6, 6, 2, 3].

Data Structures

Sort [10, 4, 7]

Print [10, 4, 7] sorted in ascending order.

Data Structures

Unique values of [10, 4, 7]

Print the unique values of [10, 4, 7], sorted (use a set).

Data Structures

Common items of two lists (['a', 'b', 'c']·2)

Print the sorted values present in BOTH [10, 4, 7] and [7, 2, 4].

Data Structures

Functions

63

Functions

Create reusable code with functions

Function with Parameters

Create functions that take inputs

Multiple Return Values

Return multiple values from functions

Default Parameters

Set default values for parameters

Max and Min

Find largest and smallest values

Sum Function

Add all numbers in a list using the sum function.

Enumerate Function

Get index and value in loops

Zip Function

Combine multiple lists

Sorted Function

Sort lists without changing original

Reversed Function: Reversing List Order

Learn to reverse the order of items in a list using the reversed() function in Python.

Lambda Functions

Create small anonymous functions

Map Function

Apply function to all list items

Filter Function

Filter list items by condition

Square of 9

Write square(x) returning x*x, then print square(9).

Default argument adds 1

Write add(a, b=1) returning a+b. Print add(9).

Sum any count of args (3 numbers)

Write total(*nums) returning their sum. Print total of [1, 2, 3].

Return two values (min & max)

Write minmax(nums) returning (min, max). Print it for [1, 2, 3].

Lambda triples 9

Make a lambda `triple` that returns x*3, then print triple(9).

Function returning a string

Write shout(s) returning s in uppercase with '!'. Print shout('python').

Recursive factorial of 9

Write a recursive factorial(n) and print factorial(9).

Square of 7

Write square(x) returning x*x, then print square(7).

Default argument adds 5

Write add(a, b=5) returning a+b. Print add(7).

Sum any count of args (4 numbers)

Write total(*nums) returning their sum. Print total of [4, 5, 6, 7].

Return two values (min & max) ([4, 5, 6, 7])

Write minmax(nums) returning (min, max). Print it for [4, 5, 6, 7].

Lambda triples 7

Make a lambda `triple` that returns x*3, then print triple(7).

Function returning a string ([4, 5, 6, 7])

Write shout(s) returning s in uppercase with '!'. Print shout('hello').

Recursive factorial of 7

Write a recursive factorial(n) and print factorial(7).

Square of 6

Write square(x) returning x*x, then print square(6).

Default argument adds 2

Write add(a, b=2) returning a+b. Print add(6).

Sum any count of args (3 numbers) ([10, 20, 30])

Write total(*nums) returning their sum. Print total of [10, 20, 30].

Return two values (min & max) ([10, 20, 30])

Write minmax(nums) returning (min, max). Print it for [10, 20, 30].

Lambda triples 6

Make a lambda `triple` that returns x*3, then print triple(6).

Function returning a string ([10, 20, 30])

Write shout(s) returning s in uppercase with '!'. Print shout('clean').

Recursive factorial of 6

Write a recursive factorial(n) and print factorial(6).

Square of 5

Write square(x) returning x*x, then print square(5).

Default argument adds 3

Write add(a, b=3) returning a+b. Print add(5).

Sum any count of args (5 numbers)

Write total(*nums) returning their sum. Print total of [2, 2, 2, 2, 2].

Return two values (min & max) ([2, 2, 2, 2, 2])

Write minmax(nums) returning (min, max). Print it for [2, 2, 2, 2, 2].

Lambda triples 5

Make a lambda `triple` that returns x*3, then print triple(5).

Function returning a string ([2, 2, 2, 2, 2])

Write shout(s) returning s in uppercase with '!'. Print shout('data').

Recursive factorial of 5

Write a recursive factorial(n) and print factorial(5).

Square of 8

Write square(x) returning x*x, then print square(8).

Default argument adds 10

Write add(a, b=10) returning a+b. Print add(8).

Sum any count of args (3 numbers) ([9, 1, 5])

Write total(*nums) returning their sum. Print total of [9, 1, 5].

Return two values (min & max) ([9, 1, 5])

Write minmax(nums) returning (min, max). Print it for [9, 1, 5].

Lambda triples 8

Make a lambda `triple` that returns x*3, then print triple(8).

Function returning a string ([9, 1, 5])

Write shout(s) returning s in uppercase with '!'. Print shout('spark').

Recursive factorial of 8

Write a recursive factorial(n) and print factorial(8).

Square of 4

Write square(x) returning x*x, then print square(4).

Default argument adds 4

Write add(a, b=4) returning a+b. Print add(4).

Sum any count of args (4 numbers) ([3, 6, 9, 12])

Write total(*nums) returning their sum. Print total of [3, 6, 9, 12].

Return two values (min & max) ([3, 6, 9, 12])

Write minmax(nums) returning (min, max). Print it for [3, 6, 9, 12].

Lambda triples 4

Make a lambda `triple` that returns x*3, then print triple(4).

Function returning a string ([3, 6, 9, 12])

Write shout(s) returning s in uppercase with '!'. Print shout('cloud').

Recursive factorial of 4

Write a recursive factorial(n) and print factorial(4).

Square of 10

Write square(x) returning x*x, then print square(10).

Default argument adds 2 ([2, 3, 4])

Write add(a, b=2) returning a+b. Print add(10).

Sum any count of args (4 numbers) ([2, 3, 4])

Write total(*nums) returning their sum. Print total of [2, 3, 4].

Return two values (min & max) ([2, 3, 4])

Write minmax(nums) returning (min, max). Print it for [2, 3, 4].

Lambda triples 10

Make a lambda `triple` that returns x*3, then print triple(10).

Recursive factorial of 10

Write a recursive factorial(n) and print factorial(10).

Default argument adds 6

Write add(a, b=6) returning a+b. Print add(8).

Sum any count of args (5 numbers) ([5, 6, 7, 8])

Write total(*nums) returning their sum. Print total of [5, 6, 7, 8].

Advanced Concepts

54

String Methods

Learn how to use string methods like upper, lower, and title.

Advanced Concepts

List Comprehension Basics

Create lists in one line

Advanced Concepts

List Comprehension with Condition

Filter while creating lists

Advanced Concepts

Dictionary Comprehension

Create dictionaries in one line

Advanced Concepts

Squares up to 5 (comprehension)

Use a list comprehension to print the squares of 1..5.

Advanced Concepts

Filter evens up to 5

Print a list of the even numbers from 1 to 5 using a comprehension.

Advanced Concepts

map() adds 10

Use map with a lambda to add 10 to each item of [1, 2, 3]; print the list.

Advanced Concepts

Index each item with enumerate

Print 'index value' for each item of [1, 2, 3] using enumerate.

Advanced Concepts

Pair two lists with zip

Zip [1, 2, 3] and [4, 5, 6] and print the list of pairs.

Advanced Concepts

Dict comprehension of squares to 5

Build a dict mapping i to i*i for 1..5 and print it.

Advanced Concepts

Squares up to 8 (comprehension)

Use a list comprehension to print the squares of 1..8.

Advanced Concepts

Filter evens up to 8

Print a list of the even numbers from 1 to 8 using a comprehension.

Advanced Concepts

map() adds 1

Use map with a lambda to add 1 to each item of [10, 20]; print the list.

Advanced Concepts

Index each item with enumerate ([10, 20])

Print 'index value' for each item of [10, 20] using enumerate.

Advanced Concepts

Pair two lists with zip ([10, 20])

Zip [10, 20] and [30, 40] and print the list of pairs.

Advanced Concepts

Dict comprehension of squares to 8

Build a dict mapping i to i*i for 1..8 and print it.

Advanced Concepts

Squares up to 6 (comprehension)

Use a list comprehension to print the squares of 1..6.

Advanced Concepts

Filter evens up to 6

Print a list of the even numbers from 1 to 6 using a comprehension.

Advanced Concepts

map() adds 5

Use map with a lambda to add 5 to each item of [2, 4, 6, 8]; print the list.

Advanced Concepts

Index each item with enumerate ([2, 4, 6, 8])

Print 'index value' for each item of [2, 4, 6, 8] using enumerate.

Advanced Concepts

Pair two lists with zip ([2, 4, 6, 8])

Zip [2, 4, 6, 8] and [1, 3, 5, 7] and print the list of pairs.

Advanced Concepts

Dict comprehension of squares to 6

Build a dict mapping i to i*i for 1..6 and print it.

Advanced Concepts

Squares up to 4 (comprehension)

Use a list comprehension to print the squares of 1..4.

Advanced Concepts

Filter evens up to 4

Print a list of the even numbers from 1 to 4 using a comprehension.

Advanced Concepts

map() adds 2

Use map with a lambda to add 2 to each item of [7, 8, 9]; print the list.

Advanced Concepts

Index each item with enumerate ([7, 8, 9])

Print 'index value' for each item of [7, 8, 9] using enumerate.

Advanced Concepts

Pair two lists with zip ([7, 8, 9])

Zip [7, 8, 9] and [1, 2, 3] and print the list of pairs.

Advanced Concepts

Dict comprehension of squares to 4

Build a dict mapping i to i*i for 1..4 and print it.

Advanced Concepts

Squares up to 10 (comprehension)

Use a list comprehension to print the squares of 1..10.

Advanced Concepts

Filter evens up to 10

Print a list of the even numbers from 1 to 10 using a comprehension.

Advanced Concepts

map() adds 100

Use map with a lambda to add 100 to each item of [5, 5]; print the list.

Advanced Concepts

Index each item with enumerate ([5, 5])

Print 'index value' for each item of [5, 5] using enumerate.

Advanced Concepts

Pair two lists with zip ([5, 5])

Zip [5, 5] and [6, 6] and print the list of pairs.

Advanced Concepts

Dict comprehension of squares to 10

Build a dict mapping i to i*i for 1..10 and print it.

Advanced Concepts

Squares up to 7 (comprehension)

Use a list comprehension to print the squares of 1..7.

Advanced Concepts

Filter evens up to 7

Print a list of the even numbers from 1 to 7 using a comprehension.

Advanced Concepts

map() adds 3

Use map with a lambda to add 3 to each item of [0, 1, 2, 3]; print the list.

Advanced Concepts

Index each item with enumerate ([0, 1, 2, 3])

Print 'index value' for each item of [0, 1, 2, 3] using enumerate.

Advanced Concepts

Pair two lists with zip ([0, 1, 2, 3])

Zip [0, 1, 2, 3] and [9, 8, 7, 6] and print the list of pairs.

Advanced Concepts

Dict comprehension of squares to 7

Build a dict mapping i to i*i for 1..7 and print it.

Advanced Concepts

map() adds 17

Use map with a lambda to add 17 to each item of [2, 3, 4]; print the list.

Advanced Concepts

Index each item with enumerate ([2, 3, 4])

Print 'index value' for each item of [2, 3, 4] using enumerate.

Advanced Concepts

Pair two lists with zip ([2, 3, 4])

Zip [2, 3, 4] and [5, 6, 7] and print the list of pairs.

Advanced Concepts

Squares up to 9 (comprehension)

Use a list comprehension to print the squares of 1..9.

Advanced Concepts

Filter evens up to 9

Print a list of the even numbers from 1 to 9 using a comprehension.

Advanced Concepts

map() adds 2 ([11, 21])

Use map with a lambda to add 2 to each item of [11, 21]; print the list.

Advanced Concepts

Index each item with enumerate ([11, 21])

Print 'index value' for each item of [11, 21] using enumerate.

Advanced Concepts

Pair two lists with zip ([11, 21])

Zip [11, 21] and [31, 41] and print the list of pairs.

Advanced Concepts

Dict comprehension of squares to 9

Build a dict mapping i to i*i for 1..9 and print it.

Advanced Concepts

map() adds 6

Use map with a lambda to add 6 to each item of [3, 5, 7, 9]; print the list.

Advanced Concepts

Index each item with enumerate ([3, 5, 7, 9])

Print 'index value' for each item of [3, 5, 7, 9] using enumerate.

Advanced Concepts

Pair two lists with zip ([3, 5, 7, 9])

Zip [3, 5, 7, 9] and [2, 4, 6, 8] and print the list of pairs.

Advanced Concepts

map() adds 3 ([8, 9, 10])

Use map with a lambda to add 3 to each item of [8, 9, 10]; print the list.

Advanced Concepts

Index each item with enumerate ([8, 9, 10])

Print 'index value' for each item of [8, 9, 10] using enumerate.

Advanced Concepts

AI Basics

1

Boolean Values

Create a simple AI prediction function

Strings

50

String Concatenation

Combine text strings

String Repetition

Repeat strings multiple times

String Length

Find the length of a string

String Uppercase

Convert text to uppercase

String Lowercase

Convert text to lowercase

String Replace

Replace parts of strings

String Split

Split strings into lists

Finding the Position of a Substring

Learn how to find the position of a substring within a string using Python.

String Slicing

Extract parts of strings

String Formatting

Format strings with variables

String Methods - Strip

Remove whitespace from strings

String First Char

Learn how to access the first character of a string.

String Last Char

Learn how to access the last character of a string in Python.

String Title Case

Learn to capitalize the first letter of each word in a string.

String Count Chars

Learn how to count the number of times a specific character appears in a string using Python.

String Starts With

Learn how to determine if a string starts with a specific prefix.

Uppercase a word: python

Print 'python' in UPPERCASE with .upper().

String Count

Count occurrences in strings

String Startswith

Check if string starts with text

String Endswith

Check if string ends with text

String Title Case

Capitalize first letter of each word

Uppercase a word: banana

Print 'banana' in UPPERCASE with .upper().

Lowercase a word: hello world

Print 'hello world' in lowercase with .lower().

String Join

Join list items into string

Lowercase a word: openSource

Print 'openSource' in lowercase with .lower().

String Isdigit

Check if string is all digits using the isdigit() method.

String Isalpha

Check if string is all letters

String Capitalize

Capitalize first letter only

Title-case a phrase: Mountain

Print 'Mountain' in Title Case with .title().

Title-case a phrase: data science

Print 'data science' in Title Case with .title().

Capitalize the first letter: keyboard

Print 'keyboard' with only the first letter capitalized using .capitalize().

Capitalize the first letter: alabama

Print 'alabama' with only the first letter capitalized using .capitalize().

Swap the case: good morning

Print 'good morning' with its case swapped using .swapcase().

Swap the case: rocket

Print 'rocket' with its case swapped using .swapcase().

Trim the spaces: javascript

Print 'javascript' with the surrounding spaces removed using .strip().

Trim the spaces: quiet river

Print 'quiet river' with the surrounding spaces removed using .strip().

Length of a string: elephant

Print the number of characters in 'elephant' with len().

Length of a string: compiler

Print the number of characters in 'compiler' with len().

Count a letter: byte stream

Print how many times 'a' appears in 'byte stream' using .count().

Count a letter: north star

Print how many times 'a' appears in 'north star' using .count().

Reverse a string: velocity

Print 'velocity' reversed using slicing [::-1].

Reverse a string: cinnamon

Print 'cinnamon' reversed using slicing [::-1].

Replace a letter: green field

In 'green field', replace every 'a' with 'o' and print the result.

Replace a letter: tangerine

In 'tangerine', replace every 'a' with 'o' and print the result.

First word of a phrase: python

Print the first word of 'python' (split on spaces).

First word of a phrase: banana

Print the first word of 'banana' (split on spaces).

First three letters: hello world

Print the first three characters of 'hello world' using slicing.

First three letters: openSource

Print the first three characters of 'openSource' using slicing.

Count the vowels: Mountain

Count the vowels (a, e, i, o, u) in 'Mountain' and print the total.

Count the vowels: data science

Count the vowels (a, e, i, o, u) in 'data science' and print the total.

Variables

27

Create Your First Variable

Store your name in a variable

Add 7 and 3

Variables hold 7 and 3. Print their sum.

Multiply 7 by 3

Print the product of 7 and 3.

Swap 7 and 3

Swap the variables, then print a then b on two lines.

Increase 7 by 5

Start at 7, add 5 with +=, and print the result.

Total of 7, 3 and 5

Three variables hold 7, 3, 5. Print their total.

Difference of 7 and 3

Print 7 minus 3.

Add 12 and 8

Variables hold 12 and 8. Print their sum.

Multiply 12 by 8

Print the product of 12 and 8.

Swap 12 and 8

Swap the variables, then print a then b on two lines.

Increase 12 by 2

Start at 12, add 2 with +=, and print the result.

Total of 12, 8 and 2

Three variables hold 12, 8, 2. Print their total.

Difference of 12 and 8

Print 12 minus 8.

Add 25 and 17

Variables hold 25 and 17. Print their sum.

Multiply 25 by 17

Print the product of 25 and 17.

Swap 25 and 17

Swap the variables, then print a then b on two lines.

Increase 25 by 10

Start at 25, add 10 with +=, and print the result.

Total of 25, 17 and 10

Three variables hold 25, 17, 10. Print their total.

Difference of 25 and 17

Print 25 minus 17.

Add 6 and 4

Variables hold 6 and 4. Print their sum.

Multiply 6 by 4

Print the product of 6 and 4.

Swap 6 and 4

Swap the variables, then print a then b on two lines.

Increase 6 by 3

Start at 6, add 3 with +=, and print the result.

Total of 6, 4 and 3

Three variables hold 6, 4, 3. Print their total.

Difference of 6 and 4

Print 6 minus 4.

Add 9 and 7

Variables hold 9 and 7. Print their sum.

Multiply 9 by 7

Print the product of 9 and 7.

Math

41

Age Calculator

Calculate age in days

Double the Number

Learn how to multiply numbers by 2 to double them.

Square Number

Learn how to square a number in Python.

Average Two Numbers

Learn how to calculate the average of two numbers using basic arithmetic.

Temperature Converter

Celsius to Fahrenheit

Circle Area

Calculate circle area

Rectangle Area

Calculate rectangle area

Triangle Area Calculation

Calculate the area of a triangle using the formula: Area = (base × height) ÷ 2

Minutes to Hours

Learn how to convert minutes into hours by using division.

Hours to Seconds

Convert hours to seconds

Shopping Total with Tax

Learn how to calculate the total price of an item after including tax.

Discount Price

Learn how to calculate a discount on a price using Python.

Cube Volume

Calculate cube volume

Speed Calculator

Learn how to calculate speed using the formula: speed = distance ÷ time.

BMI Calculator

Learn how to calculate the Body Mass Index (BMI)

Area of a 8×5 rectangle

Multiply width by height.

Area of a 12×7 rectangle

Multiply width by height.

Area of a 9×9 rectangle

Multiply width by height.

Area of a triangle (10 base, 6 height)

Triangle area is base*height/2.

Area of a triangle (7 base, 8 height)

Triangle area is base*height/2.

Area of a triangle (9 base, 4 height)

Triangle area is base*height/2.

Average of 5 numbers

Average is the sum divided by the count.

Average of 4 numbers

Average is the sum divided by the count.

Average of 6 numbers

Average is the sum divided by the count.

Largest of 7, 3, 9

max() returns the biggest value.

Largest of 12, 5, 8

max() returns the biggest value.

Largest of 4, 15, 6

max() returns the biggest value.

2 to the power of 5

The ** operator raises to a power.

3 to the power of 4

The ** operator raises to a power.

5 to the power of 3

The ** operator raises to a power.

Remainder of 17 ÷ 5

The % operator gives the remainder.

Remainder of 23 ÷ 7

The % operator gives the remainder.

Remainder of 40 ÷ 6 (Math)

The % operator gives the remainder.

Whole part of 17 ÷ 5

// keeps only the whole part of a division.

Whole part of 29 ÷ 4

// keeps only the whole part of a division.

Whole part of 50 ÷ 8

// keeps only the whole part of a division.

Sum from 1 to 10

sum(range(1, n+1)) adds the first n numbers.

Sum from 1 to 7

sum(range(1, n+1)) adds the first n numbers.

Sum from 1 to 100

sum(range(1, n+1)) adds the first n numbers.

Convert 25°C to Fahrenheit

F = C * 9/5 + 32.

Convert 37°C to Fahrenheit

F = C * 9/5 + 32.

OOP

73

Classes - Basic

Create your first class

Class Methods

Add methods to classes

BankAccount balance after deposits

Build a BankAccount (start 0) with a deposit method, deposit each of [100, 50, 25], and print the balance.

Rectangle area via a class (3×4)

Write a Rectangle class with an area() method. Print the area of a 3×4 rectangle.

Add two vectors with add

Give a Vector class an __add__ method. Print (3,4) + (1,2) as a tuple-like result.

Inheritance and polymorphism

Animal has speak(). Make Dog say 'Woof' and Cat say 'Meow'. Loop and print each.

Counter class bumped 5 times

Write a Counter class with bump(). Bump it 5 times and print its value.

Custom len on a Bag

Give a Bag class __len__. Fill it with [100, 50, 25] and print len(bag).

Stack push/pop

Write a Stack with push and pop. Push each of [100, 50, 25], pop once, and print the value popped.

BankAccount balance after deposits ([10, 20, 30, 40])

Build a BankAccount (start 0) with a deposit method, deposit each of [10, 20, 30, 40], and print the balance.

Rectangle area via a class (5×6)

Write a Rectangle class with an area() method. Print the area of a 5×6 rectangle.

Add two vectors with add ([10, 20, 30, 40])

Give a Vector class an __add__ method. Print (5,6) + (7,8) as a tuple-like result.

Counter class bumped 3 times

Write a Counter class with bump(). Bump it 3 times and print its value.

Custom len on a Bag ([10, 20, 30, 40])

Give a Bag class __len__. Fill it with [10, 20, 30, 40] and print len(bag).

Stack push/pop ([10, 20, 30, 40])

Write a Stack with push and pop. Push each of [10, 20, 30, 40], pop once, and print the value popped.

BankAccount balance after deposits ([7, 7, 7])

Build a BankAccount (start 0) with a deposit method, deposit each of [7, 7, 7], and print the balance.

Rectangle area via a class (2×9)

Write a Rectangle class with an area() method. Print the area of a 2×9 rectangle.

Add two vectors with add ([7, 7, 7])

Give a Vector class an __add__ method. Print (2,9) + (4,1) as a tuple-like result.

Counter class bumped 8 times

Write a Counter class with bump(). Bump it 8 times and print its value.

Custom len on a Bag ([7, 7, 7])

Give a Bag class __len__. Fill it with [7, 7, 7] and print len(bag).

Stack push/pop ([7, 7, 7])

Write a Stack with push and pop. Push each of [7, 7, 7], pop once, and print the value popped.

BankAccount balance after deposits ([12, 8])

Build a BankAccount (start 0) with a deposit method, deposit each of [12, 8], and print the balance.

Rectangle area via a class (6×3)

Write a Rectangle class with an area() method. Print the area of a 6×3 rectangle.

Add two vectors with add ([12, 8])

Give a Vector class an __add__ method. Print (6,3) + (2,5) as a tuple-like result.

Counter class bumped 4 times

Write a Counter class with bump(). Bump it 4 times and print its value.

Custom len on a Bag ([12, 8])

Give a Bag class __len__. Fill it with [12, 8] and print len(bag).

Stack push/pop ([12, 8])

Write a Stack with push and pop. Push each of [12, 8], pop once, and print the value popped.

BankAccount balance after deposits ([5, 5, 5, 5])

Build a BankAccount (start 0) with a deposit method, deposit each of [5, 5, 5, 5], and print the balance.

Rectangle area via a class (8×2)

Write a Rectangle class with an area() method. Print the area of a 8×2 rectangle.

Add two vectors with add ([5, 5, 5, 5])

Give a Vector class an __add__ method. Print (8,2) + (1,9) as a tuple-like result.

Counter class bumped 6 times

Write a Counter class with bump(). Bump it 6 times and print its value.

Custom len on a Bag ([5, 5, 5, 5])

Give a Bag class __len__. Fill it with [5, 5, 5, 5] and print len(bag).

Stack push/pop ([5, 5, 5, 5])

Write a Stack with push and pop. Push each of [5, 5, 5, 5], pop once, and print the value popped.

BankAccount balance after deposits ([101, 51, 26])

Build a BankAccount (start 0) with a deposit method, deposit each of [101, 51, 26], and print the balance.

Rectangle area via a class (4×5)

Write a Rectangle class with an area() method. Print the area of a 4×5 rectangle.

Add two vectors with add ([101, 51, 26])

Give a Vector class an __add__ method. Print (4,5) + (2,3) as a tuple-like result.

Custom len on a Bag ([101, 51, 26])

Give a Bag class __len__. Fill it with [101, 51, 26] and print len(bag).

Stack push/pop ([101, 51, 26])

Write a Stack with push and pop. Push each of [101, 51, 26], pop once, and print the value popped.

BankAccount balance after deposits ([11, 21, 31, 41])

Build a BankAccount (start 0) with a deposit method, deposit each of [11, 21, 31, 41], and print the balance.

Rectangle area via a class (6×7)

Write a Rectangle class with an area() method. Print the area of a 6×7 rectangle.

Add two vectors with add ([11, 21, 31, 41])

Give a Vector class an __add__ method. Print (6,7) + (8,9) as a tuple-like result.

Custom len on a Bag ([11, 21, 31, 41])

Give a Bag class __len__. Fill it with [11, 21, 31, 41] and print len(bag).

Stack push/pop ([11, 21, 31, 41])

Write a Stack with push and pop. Push each of [11, 21, 31, 41], pop once, and print the value popped.

BankAccount balance after deposits ([8, 8, 8])

Build a BankAccount (start 0) with a deposit method, deposit each of [8, 8, 8], and print the balance.

Rectangle area via a class (3×10)

Write a Rectangle class with an area() method. Print the area of a 3×10 rectangle.

Add two vectors with add ([8, 8, 8])

Give a Vector class an __add__ method. Print (3,10) + (5,2) as a tuple-like result.

Counter class bumped 9 times

Write a Counter class with bump(). Bump it 9 times and print its value.

Custom len on a Bag ([8, 8, 8])

Give a Bag class __len__. Fill it with [8, 8, 8] and print len(bag).

Stack push/pop ([8, 8, 8])

Write a Stack with push and pop. Push each of [8, 8, 8], pop once, and print the value popped.

BankAccount balance after deposits ([13, 9])

Build a BankAccount (start 0) with a deposit method, deposit each of [13, 9], and print the balance.

Rectangle area via a class (7×4)

Write a Rectangle class with an area() method. Print the area of a 7×4 rectangle.

Add two vectors with add ([13, 9])

Give a Vector class an __add__ method. Print (7,4) + (3,6) as a tuple-like result.

Custom len on a Bag ([13, 9])

Give a Bag class __len__. Fill it with [13, 9] and print len(bag).

Stack push/pop ([13, 9])

Write a Stack with push and pop. Push each of [13, 9], pop once, and print the value popped.

BankAccount balance after deposits ([6, 6, 6, 6])

Build a BankAccount (start 0) with a deposit method, deposit each of [6, 6, 6, 6], and print the balance.

Rectangle area via a class (9×3)

Write a Rectangle class with an area() method. Print the area of a 9×3 rectangle.

Add two vectors with add ([6, 6, 6, 6])

Give a Vector class an __add__ method. Print (9,3) + (2,10) as a tuple-like result.

Counter class bumped 7 times

Write a Counter class with bump(). Bump it 7 times and print its value.

Custom len on a Bag ([6, 6, 6, 6])

Give a Bag class __len__. Fill it with [6, 6, 6, 6] and print len(bag).

Stack push/pop ([6, 6, 6, 6])

Write a Stack with push and pop. Push each of [6, 6, 6, 6], pop once, and print the value popped.

BankAccount balance after deposits ([102, 52, 27])

Build a BankAccount (start 0) with a deposit method, deposit each of [102, 52, 27], and print the balance.

Add two vectors with add ([102, 52, 27])

Give a Vector class an __add__ method. Print (5,6) + (3,4) as a tuple-like result.

Custom len on a Bag ([102, 52, 27])

Give a Bag class __len__. Fill it with [102, 52, 27] and print len(bag).

Stack push/pop ([102, 52, 27])

Write a Stack with push and pop. Push each of [102, 52, 27], pop once, and print the value popped.

BankAccount balance after deposits ([12, 22, 32, 42])

Build a BankAccount (start 0) with a deposit method, deposit each of [12, 22, 32, 42], and print the balance.

Rectangle area via a class (7×8)

Write a Rectangle class with an area() method. Print the area of a 7×8 rectangle.

Add two vectors with add ([12, 22, 32, 42])

Give a Vector class an __add__ method. Print (7,8) + (9,10) as a tuple-like result.

Custom len on a Bag ([12, 22, 32, 42])

Give a Bag class __len__. Fill it with [12, 22, 32, 42] and print len(bag).

Stack push/pop ([12, 22, 32, 42])

Write a Stack with push and pop. Push each of [12, 22, 32, 42], pop once, and print the value popped.

BankAccount balance after deposits ([9, 9, 9])

Build a BankAccount (start 0) with a deposit method, deposit each of [9, 9, 9], and print the balance.

Rectangle area via a class (4×11)

Write a Rectangle class with an area() method. Print the area of a 4×11 rectangle.

Add two vectors with add ([9, 9, 9])

Give a Vector class an __add__ method. Print (4,11) + (6,3) as a tuple-like result.

Counter class bumped 10 times

Write a Counter class with bump(). Bump it 10 times and print its value.

Error Handling

3

Exception Handling

Handle errors gracefully

Multiple Exceptions

Handle different error types

Understanding the Finally Block

Learn how to use the finally block in Python for code that must execute.

Practice

76

Is 'level' a palindrome?

Print True if 'level' equals its reverse, else False.

Sum the digits of 12

Print the sum of the digits of 12.

Smallest in [5, 2, 9, 1]

Print the smallest number in [5, 2, 9, 1].

Count letters in 'hello world'

Print how many non-space characters are in 'hello world'.

Largest in [5, 2, 9, 1]

Print the largest number in [5, 2, 9, 1].

Is 'radar' a palindrome?

Print True if 'radar' equals its reverse, else False.

Sum the digits of 45

Print the sum of the digits of 45.

Smallest in [8, 8, 3]

Print the smallest number in [8, 8, 3].

Count letters in 'keep it simple'

Print how many non-space characters are in 'keep it simple'.

Largest in [8, 8, 3]

Print the largest number in [8, 8, 3].

Is 'noon' a palindrome?

Print True if 'noon' equals its reverse, else False.

Sum the digits of 90

Print the sum of the digits of 90.

Smallest in [10, 4, 20, 7]

Print the smallest number in [10, 4, 20, 7].

Count letters in 'data driven'

Print how many non-space characters are in 'data driven'.

Largest in [10, 4, 20, 7]

Print the largest number in [10, 4, 20, 7].

Is 'python' a palindrome?

Print True if 'python' equals its reverse, else False.

Sum the digits of 7

Print the sum of the digits of 7.

Smallest in [3, 6, 1, 9]

Print the smallest number in [3, 6, 1, 9].

Count letters in 'clean code'

Print how many non-space characters are in 'clean code'.

Largest in [3, 6, 1, 9]

Print the largest number in [3, 6, 1, 9].

Is 'stats' a palindrome?

Print True if 'stats' equals its reverse, else False.

Sum the digits of 38

Print the sum of the digits of 38.

Smallest in [15, 2, 8]

Print the smallest number in [15, 2, 8].

Count letters in 'open source'

Print how many non-space characters are in 'open source'.

Largest in [15, 2, 8]

Print the largest number in [15, 2, 8].

Is 'kayak' a palindrome?

Print True if 'kayak' equals its reverse, else False.

Fibonacci number #7

Print the 7th Fibonacci number (0,1,1,2,...). Use a loop.

Is 13 prime?

Print True if 13 is prime, else False.

GCD of 12 and 8

Print the greatest common divisor of 12 and 8.

Count vowels in 'education'

Print how many vowels are in 'education'.

Reverse the words of a sentence

Print the words of 'the cat sat' in reverse order, space-separated.

Sum of multiples of 3 under 13

Print the sum of all multiples of 3 below 13.

Fibonacci number #10

Print the 10th Fibonacci number (0,1,1,2,...). Use a loop.

Is 17 prime?

Print True if 17 is prime, else False.

GCD of 18 and 24

Print the greatest common divisor of 18 and 24.

Count vowels in 'mountain'

Print how many vowels are in 'mountain'.

Reverse the words of a sentence (10)

Print the words of 'keep moving forward' in reverse order, space-separated.

Sum of multiples of 5 under 17

Print the sum of all multiples of 5 below 17.

Fibonacci number #8

Print the 8th Fibonacci number (0,1,1,2,...). Use a loop.

Is 29 prime?

Print True if 29 is prime, else False.

GCD of 40 and 16

Print the greatest common divisor of 40 and 16.

Count vowels in 'keyboard'

Print how many vowels are in 'keyboard'.

Reverse the words of a sentence (8)

Print the words of 'python is fun' in reverse order, space-separated.

Sum of multiples of 4 under 29

Print the sum of all multiples of 4 below 29.

Fibonacci number #12

Print the 12th Fibonacci number (0,1,1,2,...). Use a loop.

Is 7 prime?

Print True if 7 is prime, else False.

GCD of 9 and 6

Print the greatest common divisor of 9 and 6.

Count vowels in 'yesterday'

Print how many vowels are in 'yesterday'.

Reverse the words of a sentence (12)

Print the words of 'data never sleeps' in reverse order, space-separated.

Sum of multiples of 2 under 7

Print the sum of all multiples of 2 below 7.

Fibonacci number #6

Print the 6th Fibonacci number (0,1,1,2,...). Use a loop.

Is 91 prime?

Print True if 91 is prime, else False.

GCD of 21 and 14

Print the greatest common divisor of 21 and 14.

Count vowels in 'strawberry'

Print how many vowels are in 'strawberry'.

Reverse the words of a sentence (6)

Print the words of 'read more code' in reverse order, space-separated.

Sum of multiples of 7 under 91

Print the sum of all multiples of 7 below 91.

Fibonacci number #9

Print the 9th Fibonacci number (0,1,1,2,...). Use a loop.

Is 50 prime?

Print True if 50 is prime, else False.

GCD of 100 and 35

Print the greatest common divisor of 100 and 35.

Count vowels in 'umbrella'

Print how many vowels are in 'umbrella'.

Reverse the words of a sentence (9)

Print the words of 'one step today' in reverse order, space-separated.

Sum of multiples of 10 under 50

Print the sum of all multiples of 10 below 50.

Is 20 prime?

Print True if 20 is prime, else False.

GCD of 19 and 9

Print the greatest common divisor of 19 and 9.

Sum of multiples of 4 under 20

Print the sum of all multiples of 4 below 20.

Fibonacci number #17

Print the 17th Fibonacci number (0,1,1,2,...). Use a loop.

Is 24 prime?

Print True if 24 is prime, else False.

GCD of 25 and 31

Print the greatest common divisor of 25 and 31.

Sum of multiples of 6 under 24

Print the sum of all multiples of 6 below 24.

Is 36 prime?

Print True if 36 is prime, else False.

GCD of 47 and 23

Print the greatest common divisor of 47 and 23.

Sum of multiples of 5 under 36

Print the sum of all multiples of 5 below 36.

Fibonacci number #19

Print the 19th Fibonacci number (0,1,1,2,...). Use a loop.

Is 8 prime?

Print True if 8 is prime, else False.

GCD of 10 and 7

Print the greatest common divisor of 10 and 7.

Sum of multiples of 3 under 8

Print the sum of all multiples of 3 below 8.

Loops

50

Sum of even numbers up to 20

Add every even number from 1 to 20 and print the total.

Sum the squares to 20

Print the sum of the squares of 1 to 20.

Product of 1 to 20

Multiply every number from 1 to 20 and print the product.

Count items over 5

In the list [5, 12, 7, 20, 3], count how many values are greater than 5 and print the count.

Multiplication row for 3

Print 3×1 through 3×5, one product per line.

Countdown from 20 by 3

Using a while loop, print 20, then keep subtracting 3 and printing until the value is below 1.

Sum a list of 5 numbers

Loop over [5, 12, 7, 20, 3] and print the running total only at the end.

Sum of even numbers up to 10

Add every even number from 1 to 10 and print the total.

Sum the squares to 10

Print the sum of the squares of 1 to 10.

Product of 1 to 10

Multiply every number from 1 to 10 and print the product.

Count items over 10

In the list [1, 9, 4, 8, 2], count how many values are greater than 10 and print the count.

Multiplication row for 4

Print 4×1 through 4×5, one product per line.

Countdown from 10 by 2

Using a while loop, print 10, then keep subtracting 2 and printing until the value is below 1.

Sum a list of 5 numbers ([1, 9, 4, 8, 2])

Loop over [1, 9, 4, 8, 2] and print the running total only at the end.

Sum of even numbers up to 50

Add every even number from 1 to 50 and print the total.

Sum the squares to 50

Print the sum of the squares of 1 to 50.

Product of 1 to 50

Multiply every number from 1 to 50 and print the product.

Count items over 15

In the list [30, 10, 40, 20], count how many values are greater than 15 and print the count.

Multiplication row for 6

Print 6×1 through 6×5, one product per line.

Countdown from 50 by 5

Using a while loop, print 50, then keep subtracting 5 and printing until the value is below 1.

Sum a list of 4 numbers

Loop over [30, 10, 40, 20] and print the running total only at the end.

Sum of even numbers up to 15

Add every even number from 1 to 15 and print the total.

Sum the squares to 15

Print the sum of the squares of 1 to 15.

Product of 1 to 15

Multiply every number from 1 to 15 and print the product.

Count items over 7

In the list [7, 7, 8, 2, 11], count how many values are greater than 7 and print the count.

Multiplication row for 7

Print 7×1 through 7×5, one product per line.

Countdown from 15 by 3

Using a while loop, print 15, then keep subtracting 3 and printing until the value is below 1.

Sum a list of 5 numbers ([7, 7, 8, 2, 11])

Loop over [7, 7, 8, 2, 11] and print the running total only at the end.

Sum of even numbers up to 30

Add every even number from 1 to 30 and print the total.

Sum the squares to 30

Print the sum of the squares of 1 to 30.

Product of 1 to 30

Multiply every number from 1 to 30 and print the product.

Count items over 20

In the list [100, 50, 25], count how many values are greater than 20 and print the count.

Multiplication row for 9

Print 9×1 through 9×5, one product per line.

Countdown from 30 by 4

Using a while loop, print 30, then keep subtracting 4 and printing until the value is below 1.

Sum a list of 3 numbers

Loop over [100, 50, 25] and print the running total only at the end.

Sum of even numbers up to 8

Add every even number from 1 to 8 and print the total.

Sum the squares to 8

Print the sum of the squares of 1 to 8.

Product of 1 to 8

Multiply every number from 1 to 8 and print the product.

Count items over 3

In the list [3, 6, 9, 12, 15], count how many values are greater than 3 and print the count.

Multiplication row for 2

Print 2×1 through 2×5, one product per line.

Countdown from 8 by 1

Using a while loop, print 8, then keep subtracting 1 and printing until the value is below 1.

Sum a list of 5 numbers ([3, 6, 9, 12, 15])

Loop over [3, 6, 9, 12, 15] and print the running total only at the end.

Sum of even numbers up to 12

Add every even number from 1 to 12 and print the total.

Sum the squares to 12

Print the sum of the squares of 1 to 12.

Product of 1 to 12

Multiply every number from 1 to 12 and print the product.

Count items over 25

In the list [8, 8, 8, 8], count how many values are greater than 25 and print the count.

Multiplication row for 5

Print 5×1 through 5×5, one product per line.

Countdown from 12 by 2

Using a while loop, print 12, then keep subtracting 2 and printing until the value is below 1.

Sum a list of 4 numbers ([8, 8, 8, 8])

Loop over [8, 8, 8, 8] and print the running total only at the end.

Sum of even numbers up to 100

Add every even number from 1 to 100 and print the total.

Algorithms

72

Binary search for 23

Print the index of 23 in the sorted list [2, 5, 8, 12, 16, 23, 38, 56] using binary search (or -1).

Count 23 in a list

Without using .count(), loop through [4, 2, 7, 2, 9, 2] and print how many times 23 appears.

Bubble sort [4, 2, 7, 2, 9, 2]

Implement bubble sort on [4, 2, 7, 2, 9, 2] and print the sorted list.

Digit sum of 4827

Print the sum of the digits of 4827 using a loop (no str trick required).

Reverse the number 4827

Print 4827 with its digits reversed (as an integer).

GCD of 48 and 36 (Euclid)

Implement Euclid's algorithm to print gcd(48, 36).

Count primes below 30

Print how many prime numbers are below 30.

Maximum subarray sum

Print the largest sum of any contiguous run in [-2, 1, -3, 4, -1, 2, 1, -5, 4] (Kadane's algorithm).

Binary search for 16

Print the index of 16 in the sorted list [1, 4, 9, 16, 25, 36] using binary search (or -1).

Count 16 in a list

Without using .count(), loop through [5, 5, 1, 5, 3] and print how many times 16 appears.

Bubble sort [5, 5, 1, 5, 3]

Implement bubble sort on [5, 5, 1, 5, 3] and print the sorted list.

Digit sum of 915

Print the sum of the digits of 915 using a loop (no str trick required).

Reverse the number 915

Print 915 with its digits reversed (as an integer).

GCD of 54 and 24 (Euclid)

Implement Euclid's algorithm to print gcd(54, 24).

Count primes below 20

Print how many prime numbers are below 20.

Maximum subarray sum ([1, 4, 9, 16, 25, 36])

Print the largest sum of any contiguous run in [1, -2, 3, 4, -1] (Kadane's algorithm).

Binary search for 40

Print the index of 40 in the sorted list [10, 20, 30, 40, 50] using binary search (or -1).

Count 40 in a list

Without using .count(), loop through [8, 1, 8, 8, 2, 8] and print how many times 40 appears.

Bubble sort [8, 1, 8, 8, 2, 8]

Implement bubble sort on [8, 1, 8, 8, 2, 8] and print the sorted list.

Digit sum of 3406

Print the sum of the digits of 3406 using a loop (no str trick required).

Reverse the number 3406

Print 3406 with its digits reversed (as an integer).

GCD of 21 and 14 (Euclid)

Implement Euclid's algorithm to print gcd(21, 14).

Count primes below 50

Print how many prime numbers are below 50.

Maximum subarray sum ([10, 20, 30, 40, 50])

Print the largest sum of any contiguous run in [-1, -2, -3, 4, 5] (Kadane's algorithm).

Binary search for 7

Print the index of 7 in the sorted list [3, 7, 11, 15, 19] using binary search (or -1).

Count 7 in a list

Without using .count(), loop through [6, 6, 6, 1] and print how many times 7 appears.

Bubble sort [6, 6, 6, 1]

Implement bubble sort on [6, 6, 6, 1] and print the sorted list.

Digit sum of 762

Print the sum of the digits of 762 using a loop (no str trick required).

Reverse the number 762

Print 762 with its digits reversed (as an integer).

GCD of 100 and 35 (Euclid)

Implement Euclid's algorithm to print gcd(100, 35).

Count primes below 40

Print how many prime numbers are below 40.

Maximum subarray sum ([3, 7, 11, 15, 19])

Print the largest sum of any contiguous run in [2, -1, 2, -1, 3] (Kadane's algorithm).

Binary search for 91

Print the index of 91 in the sorted list [12, 34, 56, 78, 91] using binary search (or -1).

Count 91 in a list

Without using .count(), loop through [9, 2, 9, 4, 9] and print how many times 91 appears.

Bubble sort [9, 2, 9, 4, 9]

Implement bubble sort on [9, 2, 9, 4, 9] and print the sorted list.

Digit sum of 1234

Print the sum of the digits of 1234 using a loop (no str trick required).

Reverse the number 1234

Print 1234 with its digits reversed (as an integer).

GCD of 81 and 27 (Euclid)

Implement Euclid's algorithm to print gcd(81, 27).

Count primes below 15

Print how many prime numbers are below 15.

Maximum subarray sum ([12, 34, 56, 78, 91])

Print the largest sum of any contiguous run in [4, -3, 5, -2, 1] (Kadane's algorithm).

Binary search for 30

Print the index of 30 in the sorted list [3, 6, 9, 13, 17, 24, 39, 57] using binary search (or -1).

Count 30 in a list

Without using .count(), loop through [5, 3, 8, 3, 10, 3] and print how many times 30 appears.

Bubble sort [5, 3, 8, 3, 10, 3]

Implement bubble sort on [5, 3, 8, 3, 10, 3] and print the sorted list.

Digit sum of 4834

Print the sum of the digits of 4834 using a loop (no str trick required).

Reverse the number 4834

Print 4834 with its digits reversed (as an integer).

GCD of 55 and 43 (Euclid)

Implement Euclid's algorithm to print gcd(55, 43).

Count primes below 37

Print how many prime numbers are below 37.

Maximum subarray sum ([3, 6, 9, 13, 17, 24, 39, 57])

Print the largest sum of any contiguous run in [-1, 2, -2, 5, 0, 3, 2, -4, 5] (Kadane's algorithm).

Binary search for 23 ([2, 5, 10, 17, 26, 37])

Print the index of 23 in the sorted list [2, 5, 10, 17, 26, 37] using binary search (or -1).

Count 23 in a list ([2, 5, 10, 17, 26, 37])

Without using .count(), loop through [6, 6, 2, 6, 4] and print how many times 23 appears.

Bubble sort [6, 6, 2, 6, 4]

Implement bubble sort on [6, 6, 2, 6, 4] and print the sorted list.

Digit sum of 922

Print the sum of the digits of 922 using a loop (no str trick required).

Reverse the number 922

Print 922 with its digits reversed (as an integer).

GCD of 61 and 31 (Euclid)

Implement Euclid's algorithm to print gcd(61, 31).

Count primes below 27

Print how many prime numbers are below 27.

Maximum subarray sum ([2, 5, 10, 17, 26, 37])

Print the largest sum of any contiguous run in [2, -1, 4, 5, 0] (Kadane's algorithm).

Binary search for 47

Print the index of 47 in the sorted list [11, 21, 31, 41, 51] using binary search (or -1).

Count 47 in a list

Without using .count(), loop through [9, 2, 9, 9, 3, 9] and print how many times 47 appears.

Bubble sort [9, 2, 9, 9, 3, 9]

Implement bubble sort on [9, 2, 9, 9, 3, 9] and print the sorted list.

Digit sum of 3413

Print the sum of the digits of 3413 using a loop (no str trick required).

Reverse the number 3413

Print 3413 with its digits reversed (as an integer).

GCD of 28 and 21 (Euclid)

Implement Euclid's algorithm to print gcd(28, 21).

Count primes below 57

Print how many prime numbers are below 57.

Maximum subarray sum ([11, 21, 31, 41, 51])

Print the largest sum of any contiguous run in [0, -1, -2, 5, 6] (Kadane's algorithm).

Binary search for 8

Print the index of 8 in the sorted list [4, 8, 12, 16, 20] using binary search (or -1).

Count 8 in a list

Without using .count(), loop through [7, 7, 7, 2] and print how many times 8 appears.

Bubble sort [7, 7, 7, 2]

Implement bubble sort on [7, 7, 7, 2] and print the sorted list.

Digit sum of 769

Print the sum of the digits of 769 using a loop (no str trick required).

Reverse the number 769

Print 769 with its digits reversed (as an integer).

GCD of 107 and 42 (Euclid)

Implement Euclid's algorithm to print gcd(107, 42).

Count primes below 47

Print how many prime numbers are below 47.

Maximum subarray sum ([4, 8, 12, 16, 20])

Print the largest sum of any contiguous run in [3, 0, 3, 0, 4] (Kadane's algorithm).

Data Analysis

72

Mean of a 6-value dataset

Print the mean of [4, 8, 15, 16, 23, 42] rounded to 2 decimals.

Median of a dataset

Print the median of [4, 8, 15, 16, 23, 42].

Most common value (mode)

Print the mode (most frequent value) of [2, 3, 3, 3, 5, 2].

Range (max − min)

Print the range (max minus min) of [4, 8, 15, 16, 23, 42].

Count values above 15

Print how many values in [4, 8, 15, 16, 23, 42] are greater than 15.

Population standard deviation

Print the population standard deviation of [4, 8, 15, 16, 23, 42] rounded to 2 decimals.

Top 3 highest values

Print the 3 largest values of [4, 8, 15, 16, 23, 42] in descending order.

Sum of the even values

Print the sum of only the even numbers in [4, 8, 15, 16, 23, 42].

Mean of a 4-value dataset

Print the mean of [10, 20, 30, 40] rounded to 2 decimals.

Median of a dataset ([10, 20, 30, 40])

Print the median of [10, 20, 30, 40].

Most common value (mode) ([10, 20, 30, 40])

Print the mode (most frequent value) of [7, 7, 1, 7, 9].

Range (max − min) ([10, 20, 30, 40])

Print the range (max minus min) of [10, 20, 30, 40].

Count values above 25

Print how many values in [10, 20, 30, 40] are greater than 25.

Population standard deviation ([10, 20, 30, 40])

Print the population standard deviation of [10, 20, 30, 40] rounded to 2 decimals.

Top 3 highest values ([10, 20, 30, 40])

Print the 3 largest values of [10, 20, 30, 40] in descending order.

Sum of the even values ([10, 20, 30, 40])

Print the sum of only the even numbers in [10, 20, 30, 40].

Mean of a 7-value dataset

Print the mean of [5, 9, 1, 7, 3, 8, 2] rounded to 2 decimals.

Median of a dataset ([5, 9, 1, 7, 3, 8, 2])

Print the median of [5, 9, 1, 7, 3, 8, 2].

Most common value (mode) ([5, 9, 1, 7, 3, 8, 2])

Print the mode (most frequent value) of [4, 4, 4, 1, 2].

Range (max − min) ([5, 9, 1, 7, 3, 8, 2])

Print the range (max minus min) of [5, 9, 1, 7, 3, 8, 2].

Count values above 4

Print how many values in [5, 9, 1, 7, 3, 8, 2] are greater than 4.

Population standard deviation ([5, 9, 1, 7, 3, 8, 2])

Print the population standard deviation of [5, 9, 1, 7, 3, 8, 2] rounded to 2 decimals.

Top 3 highest values ([5, 9, 1, 7, 3, 8, 2])

Print the 3 largest values of [5, 9, 1, 7, 3, 8, 2] in descending order.

Sum of the even values ([5, 9, 1, 7, 3, 8, 2])

Print the sum of only the even numbers in [5, 9, 1, 7, 3, 8, 2].

Mean of a 5-value dataset

Print the mean of [12, 18, 24, 30, 36] rounded to 2 decimals.

Median of a dataset ([12, 18, 24, 30, 36])

Print the median of [12, 18, 24, 30, 36].

Most common value (mode) ([12, 18, 24, 30, 36])

Print the mode (most frequent value) of [6, 6, 2, 6, 8, 6].

Range (max − min) ([12, 18, 24, 30, 36])

Print the range (max minus min) of [12, 18, 24, 30, 36].

Count values above 20

Print how many values in [12, 18, 24, 30, 36] are greater than 20.

Population standard deviation ([12, 18, 24, 30, 36])

Print the population standard deviation of [12, 18, 24, 30, 36] rounded to 2 decimals.

Top 3 highest values ([12, 18, 24, 30, 36])

Print the 3 largest values of [12, 18, 24, 30, 36] in descending order.

Sum of the even values ([12, 18, 24, 30, 36])

Print the sum of only the even numbers in [12, 18, 24, 30, 36].

Mean of a 7-value dataset ([3, 6, 9, 12, 15, 18, 21])

Print the mean of [3, 6, 9, 12, 15, 18, 21] rounded to 2 decimals.

Median of a dataset ([3, 6, 9, 12, 15, 18, 21])

Print the median of [3, 6, 9, 12, 15, 18, 21].

Most common value (mode) ([3, 6, 9, 12, 15, 18, 21])

Print the mode (most frequent value) of [1, 9, 9, 9, 3].

Range (max − min) ([3, 6, 9, 12, 15, 18, 21])

Print the range (max minus min) of [3, 6, 9, 12, 15, 18, 21].

Count values above 10

Print how many values in [3, 6, 9, 12, 15, 18, 21] are greater than 10.

Population standard deviation ([3, 6, 9, 12, 15, 18, 21])

Print the population standard deviation of [3, 6, 9, 12, 15, 18, 21] rounded to 2 decimals.

Top 3 highest values ([3, 6, 9, 12, 15, 18, 21])

Print the 3 largest values of [3, 6, 9, 12, 15, 18, 21] in descending order.

Sum of the even values ([3, 6, 9, 12, 15, 18, 21])

Print the sum of only the even numbers in [3, 6, 9, 12, 15, 18, 21].

Mean of a 6-value dataset ([5, 9, 16, 17, 24, 43])

Print the mean of [5, 9, 16, 17, 24, 43] rounded to 2 decimals.

Median of a dataset ([5, 9, 16, 17, 24, 43])

Print the median of [5, 9, 16, 17, 24, 43].

Most common value (mode) ([5, 9, 16, 17, 24, 43])

Print the mode (most frequent value) of [3, 4, 4, 4, 6, 3].

Range (max − min) ([5, 9, 16, 17, 24, 43])

Print the range (max minus min) of [5, 9, 16, 17, 24, 43].

Count values above 22

Print how many values in [5, 9, 16, 17, 24, 43] are greater than 22.

Population standard deviation ([5, 9, 16, 17, 24, 43])

Print the population standard deviation of [5, 9, 16, 17, 24, 43] rounded to 2 decimals.

Top 3 highest values ([5, 9, 16, 17, 24, 43])

Print the 3 largest values of [5, 9, 16, 17, 24, 43] in descending order.

Sum of the even values ([5, 9, 16, 17, 24, 43])

Print the sum of only the even numbers in [5, 9, 16, 17, 24, 43].

Mean of a 4-value dataset ([11, 21, 31, 41])

Print the mean of [11, 21, 31, 41] rounded to 2 decimals.

Median of a dataset ([11, 21, 31, 41])

Print the median of [11, 21, 31, 41].

Most common value (mode) ([11, 21, 31, 41])

Print the mode (most frequent value) of [8, 8, 2, 8, 10].

Range (max − min) ([11, 21, 31, 41])

Print the range (max minus min) of [11, 21, 31, 41].

Count values above 32

Print how many values in [11, 21, 31, 41] are greater than 32.

Population standard deviation ([11, 21, 31, 41])

Print the population standard deviation of [11, 21, 31, 41] rounded to 2 decimals.

Top 3 highest values ([11, 21, 31, 41])

Print the 3 largest values of [11, 21, 31, 41] in descending order.

Sum of the even values ([11, 21, 31, 41])

Print the sum of only the even numbers in [11, 21, 31, 41].

Mean of a 7-value dataset ([6, 10, 2, 8, 4, 9, 3])

Print the mean of [6, 10, 2, 8, 4, 9, 3] rounded to 2 decimals.

Median of a dataset ([6, 10, 2, 8, 4, 9, 3])

Print the median of [6, 10, 2, 8, 4, 9, 3].

Most common value (mode) ([6, 10, 2, 8, 4, 9, 3])

Print the mode (most frequent value) of [5, 5, 5, 2, 3].

Range (max − min) ([6, 10, 2, 8, 4, 9, 3])

Print the range (max minus min) of [6, 10, 2, 8, 4, 9, 3].

Count values above 5

Print how many values in [6, 10, 2, 8, 4, 9, 3] are greater than 5.

Population standard deviation ([6, 10, 2, 8, 4, 9, 3])

Print the population standard deviation of [6, 10, 2, 8, 4, 9, 3] rounded to 2 decimals.

Top 3 highest values ([6, 10, 2, 8, 4, 9, 3])

Print the 3 largest values of [6, 10, 2, 8, 4, 9, 3] in descending order.

Sum of the even values ([6, 10, 2, 8, 4, 9, 3])

Print the sum of only the even numbers in [6, 10, 2, 8, 4, 9, 3].

Mean of a 5-value dataset ([13, 19, 25, 31, 37])

Print the mean of [13, 19, 25, 31, 37] rounded to 2 decimals.

Median of a dataset ([13, 19, 25, 31, 37])

Print the median of [13, 19, 25, 31, 37].

Most common value (mode) ([13, 19, 25, 31, 37])

Print the mode (most frequent value) of [7, 7, 3, 7, 9, 7].

Range (max − min) ([13, 19, 25, 31, 37])

Print the range (max minus min) of [13, 19, 25, 31, 37].

Count values above 27

Print how many values in [13, 19, 25, 31, 37] are greater than 27.

Population standard deviation ([13, 19, 25, 31, 37])

Print the population standard deviation of [13, 19, 25, 31, 37] rounded to 2 decimals.

Top 3 highest values ([13, 19, 25, 31, 37])

Print the 3 largest values of [13, 19, 25, 31, 37] in descending order.

Sum of the even values ([13, 19, 25, 31, 37])

Print the sum of only the even numbers in [13, 19, 25, 31, 37].

File Operations

72

Count the lines of a text block

The text has 4 lines. Read it from a StringIO and print the line count.

File Operations

Sum numbers, one per line

Each line of the text holds a number. Print the total of [10, 20, 30].

File Operations

Count words in a paragraph

Print how many words are in the text 'the quick brown fox jumps'.

File Operations

Count lines containing 'INFO'

Print how many lines of the text contain 'INFO'.

File Operations

Sum a CSV column

Parse the CSV with the csv module and print the sum of the 'qty' column.

File Operations

Length of the longest line

Print the length of the longest line in the text.

File Operations

Count the lines of a text block ([5, 5, 5, 5])

The text has 6 lines. Read it from a StringIO and print the line count.

File Operations

Sum numbers, one per line ([5, 5, 5, 5])

Each line of the text holds a number. Print the total of [5, 5, 5, 5].

File Operations

Count words in a paragraph ([5, 5, 5, 5])

Print how many words are in the text 'data pipelines move records daily'.

File Operations

Count lines containing 'load'

Print how many lines of the text contain 'load'.

File Operations

Sum a CSV column ([5, 5, 5, 5])

Parse the CSV with the csv module and print the sum of the 'qty' column.

File Operations

Length of the longest line ([5, 5, 5, 5])

Print the length of the longest line in the text.

File Operations

Count the lines of a text block ([7, 1, 9, 2, 4])

The text has 3 lines. Read it from a StringIO and print the line count.

File Operations

Sum numbers, one per line ([7, 1, 9, 2, 4])

Each line of the text holds a number. Print the total of [7, 1, 9, 2, 4].

File Operations

Count words in a paragraph ([7, 1, 9, 2, 4])

Print how many words are in the text 'clean code reads like prose'.

File Operations

Count lines containing 'ping'

Print how many lines of the text contain 'ping'.

File Operations

Sum a CSV column ([7, 1, 9, 2, 4])

Parse the CSV with the csv module and print the sum of the 'qty' column.

File Operations

Length of the longest line ([7, 1, 9, 2, 4])

Print the length of the longest line in the text.

File Operations

Count the lines of a text block ([100, 50, 25])

The text has 5 lines. Read it from a StringIO and print the line count.

File Operations

Sum numbers, one per line ([100, 50, 25])

Each line of the text holds a number. Print the total of [100, 50, 25].

File Operations

Count words in a paragraph ([100, 50, 25])

Print how many words are in the text 'small steps build big systems'.

File Operations

Count lines containing 'WARN'

Print how many lines of the text contain 'WARN'.

File Operations

Sum a CSV column ([100, 50, 25])

Parse the CSV with the csv module and print the sum of the 'qty' column.

File Operations

Length of the longest line ([100, 50, 25])

Print the length of the longest line in the text.

File Operations

Count the lines of a text block ([2, 4, 6, 8])

The text has 7 lines. Read it from a StringIO and print the line count.

File Operations

Sum numbers, one per line ([2, 4, 6, 8])

Each line of the text holds a number. Print the total of [2, 4, 6, 8].

File Operations

Count words in a paragraph ([2, 4, 6, 8])

Print how many words are in the text 'practice turns ideas into skill'.

File Operations

Count lines containing 'read'

Print how many lines of the text contain 'read'.

File Operations

Sum a CSV column ([2, 4, 6, 8])

Parse the CSV with the csv module and print the sum of the 'qty' column.

File Operations

Length of the longest line ([2, 4, 6, 8])

Print the length of the longest line in the text.

File Operations

Count the lines of a text block ([3, 3, 3, 3, 3])

The text has 8 lines. Read it from a StringIO and print the line count.

File Operations

Sum numbers, one per line ([3, 3, 3, 3, 3])

Each line of the text holds a number. Print the total of [3, 3, 3, 3, 3].

File Operations

Count words in a paragraph ([3, 3, 3, 3, 3])

Print how many words are in the text 'logs reveal what really happened'.

File Operations

Count lines containing 'ok'

Print how many lines of the text contain 'ok'.

File Operations

Sum a CSV column ([3, 3, 3, 3, 3])

Parse the CSV with the csv module and print the sum of the 'qty' column.

File Operations

Length of the longest line ([3, 3, 3, 3, 3])

Print the length of the longest line in the text.

File Operations

Count the lines of a text block ([40, 2])

The text has 2 lines. Read it from a StringIO and print the line count.

File Operations

Sum numbers, one per line ([40, 2])

Each line of the text holds a number. Print the total of [40, 2].

File Operations

Count words in a paragraph ([40, 2])

Print how many words are in the text 'every record tells a story'.

File Operations

Count lines containing 'step'

Print how many lines of the text contain 'step'.

File Operations

Sum a CSV column ([40, 2])

Parse the CSV with the csv module and print the sum of the 'qty' column.

File Operations

Length of the longest line ([40, 2])

Print the length of the longest line in the text.

File Operations

Count the lines of a text block ([1, 1, 1, 1, 1, 1])

The text has 9 lines. Read it from a StringIO and print the line count.

File Operations

Sum numbers, one per line ([1, 1, 1, 1, 1, 1])

Each line of the text holds a number. Print the total of [1, 1, 1, 1, 1, 1].

File Operations

Count words in a paragraph ([1, 1, 1, 1, 1, 1])

Print how many words are in the text 'parse then validate then store'.

File Operations

Count lines containing 'fail'

Print how many lines of the text contain 'fail'.

File Operations

Length of the longest line ([1, 1, 1, 1, 1, 1])

Print the length of the longest line in the text.

File Operations

Sum numbers, one per line ([12, 8, 20])

Each line of the text holds a number. Print the total of [12, 8, 20].

File Operations

Count words in a paragraph ([12, 8, 20])

Print how many words are in the text 'streams flow through the buffer'.

File Operations

Sum numbers, one per line ([9, 9, 9])

Each line of the text holds a number. Print the total of [9, 9, 9].

File Operations

Count words in a paragraph ([9, 9, 9])

Print how many words are in the text 'errors hide in the edge cases'.

File Operations

Sum numbers, one per line ([50, 50])

Each line of the text holds a number. Print the total of [50, 50].

File Operations

Count words in a paragraph ([50, 50])

Print how many words are in the text 'tokens become trees become code'.

File Operations

Count the lines of a text block ([2, 2, 2, 2])

The text has 10 lines. Read it from a StringIO and print the line count.

File Operations

Sum numbers, one per line ([2, 2, 2, 2])

Each line of the text holds a number. Print the total of [2, 2, 2, 2].

File Operations

Count words in a paragraph ([2, 2, 2, 2])

Print how many words are in the text 'cache the slow parts only'.

File Operations

Sum numbers, one per line ([11, 21, 31])

Each line of the text holds a number. Print the total of [11, 21, 31].

File Operations

Sum numbers, one per line ([6, 6, 6, 6])

Each line of the text holds a number. Print the total of [6, 6, 6, 6].

File Operations

Sum numbers, one per line ([8, 2, 10, 3, 5])

Each line of the text holds a number. Print the total of [8, 2, 10, 3, 5].

File Operations

Sum numbers, one per line ([101, 51, 26])

Each line of the text holds a number. Print the total of [101, 51, 26].

File Operations

Sum numbers, one per line ([3, 5, 7, 9])

Each line of the text holds a number. Print the total of [3, 5, 7, 9].

File Operations

Sum numbers, one per line ([4, 4, 4, 4, 4])

Each line of the text holds a number. Print the total of [4, 4, 4, 4, 4].

File Operations

Sum numbers, one per line ([41, 3])

Each line of the text holds a number. Print the total of [41, 3].

File Operations

Sum numbers, one per line ([2, 2, 2, 2, 2, 2])

Each line of the text holds a number. Print the total of [2, 2, 2, 2, 2, 2].

File Operations

Sum numbers, one per line ([13, 9, 21])

Each line of the text holds a number. Print the total of [13, 9, 21].

File Operations

Sum numbers, one per line ([10, 10, 10])

Each line of the text holds a number. Print the total of [10, 10, 10].

File Operations

Sum numbers, one per line ([51, 51])

Each line of the text holds a number. Print the total of [51, 51].

File Operations

Count the lines of a text block ([3, 3, 3, 3])

The text has 17 lines. Read it from a StringIO and print the line count.

File Operations

Sum numbers, one per line ([3, 3, 3, 3])

Each line of the text holds a number. Print the total of [3, 3, 3, 3].

File Operations

Sum numbers, one per line ([12, 22, 32])

Each line of the text holds a number. Print the total of [12, 22, 32].

File Operations

Sum numbers, one per line ([7, 7, 7, 7])

Each line of the text holds a number. Print the total of [7, 7, 7, 7].

File Operations

Sum numbers, one per line ([9, 3, 11, 4, 6])

Each line of the text holds a number. Print the total of [9, 3, 11, 4, 6].

File Operations

Libraries

71

Most common item with Counter

Use collections.Counter to print the most common value in [3, 1, 3, 2, 3] and its count, like `value count`.

Factorial of 5 with math

Use math.factorial to print 5 factorial.

gcd(5, 12) with math

Use math.gcd to print the greatest common divisor of 5 and 12.

Sum amounts from JSON

Parse the JSON list of orders and print the total of the `amount` fields.

Extract numbers with regex

Use re.findall to print the sum of every number embedded in the text.

Rotate a deque by 1

Use collections.deque to rotate [3, 1, 3, 2, 3] right by 1 and print the result as a list.

Seeded dice roll (seed 0)

Seed random with 0, then print the sum of 1 dice rolls (random.randint(1,6)).

Group numbers by parity

Use a defaultdict to group [3, 1, 3, 2, 3] into 'even' and 'odd' lists and print the dict.

Most common item with Counter ([7, 7, 1, 9])

Use collections.Counter to print the most common value in [7, 7, 1, 9] and its count, like `value count`.

Factorial of 6 with math

Use math.factorial to print 6 factorial.

gcd(6, 8) with math

Use math.gcd to print the greatest common divisor of 6 and 8.

Sum amounts from JSON ([7, 7, 1, 9])

Parse the JSON list of orders and print the total of the `amount` fields.

Extract numbers with regex ([7, 7, 1, 9])

Use re.findall to print the sum of every number embedded in the text.

Rotate a deque by 2

Use collections.deque to rotate [7, 7, 1, 9] right by 2 and print the result as a list.

Seeded dice roll (seed 1)

Seed random with 1, then print the sum of 2 dice rolls (random.randint(1,6)).

Group numbers by parity ([7, 7, 1, 9])

Use a defaultdict to group [7, 7, 1, 9] into 'even' and 'odd' lists and print the dict.

Most common item with Counter ([2, 4, 2, 4, 2])

Use collections.Counter to print the most common value in [2, 4, 2, 4, 2] and its count, like `value count`.

Factorial of 4 with math

Use math.factorial to print 4 factorial.

gcd(4, 9) with math

Use math.gcd to print the greatest common divisor of 4 and 9.

Sum amounts from JSON ([2, 4, 2, 4, 2])

Parse the JSON list of orders and print the total of the `amount` fields.

Extract numbers with regex ([2, 4, 2, 4, 2])

Use re.findall to print the sum of every number embedded in the text.

Rotate a deque by 3

Use collections.deque to rotate [2, 4, 2, 4, 2] right by 3 and print the result as a list.

Seeded dice roll (seed 7)

Seed random with 7, then print the sum of 3 dice rolls (random.randint(1,6)).

Group numbers by parity ([2, 4, 2, 4, 2])

Use a defaultdict to group [2, 4, 2, 4, 2] into 'even' and 'odd' lists and print the dict.

Most common item with Counter ([8, 8, 8, 1])

Use collections.Counter to print the most common value in [8, 8, 8, 1] and its count, like `value count`.

Factorial of 7 with math

Use math.factorial to print 7 factorial.

gcd(7, 21) with math

Use math.gcd to print the greatest common divisor of 7 and 21.

Sum amounts from JSON ([8, 8, 8, 1])

Parse the JSON list of orders and print the total of the `amount` fields.

Extract numbers with regex ([8, 8, 8, 1])

Use re.findall to print the sum of every number embedded in the text.

Rotate a deque by 1 ([8, 8, 8, 1])

Use collections.deque to rotate [8, 8, 8, 1] right by 1 and print the result as a list.

Seeded dice roll (seed 42)

Seed random with 42, then print the sum of 1 dice rolls (random.randint(1,6)).

Group numbers by parity ([8, 8, 8, 1])

Use a defaultdict to group [8, 8, 8, 1] into 'even' and 'odd' lists and print the dict.

Most common item with Counter ([5, 9, 5, 5, 1])

Use collections.Counter to print the most common value in [5, 9, 5, 5, 1] and its count, like `value count`.

Factorial of 3 with math

Use math.factorial to print 3 factorial.

gcd(3, 15) with math

Use math.gcd to print the greatest common divisor of 3 and 15.

Sum amounts from JSON ([5, 9, 5, 5, 1])

Parse the JSON list of orders and print the total of the `amount` fields.

Extract numbers with regex ([5, 9, 5, 5, 1])

Use re.findall to print the sum of every number embedded in the text.

Rotate a deque by 2 ([5, 9, 5, 5, 1])

Use collections.deque to rotate [5, 9, 5, 5, 1] right by 2 and print the result as a list.

Seeded dice roll (seed 3)

Seed random with 3, then print the sum of 2 dice rolls (random.randint(1,6)).

Group numbers by parity ([5, 9, 5, 5, 1])

Use a defaultdict to group [5, 9, 5, 5, 1] into 'even' and 'odd' lists and print the dict.

Most common item with Counter ([4, 2, 4, 3, 4])

Use collections.Counter to print the most common value in [4, 2, 4, 3, 4] and its count, like `value count`.

gcd(6, 19) with math

Use math.gcd to print the greatest common divisor of 6 and 19.

Sum amounts from JSON ([4, 2, 4, 3, 4])

Parse the JSON list of orders and print the total of the `amount` fields.

Extract numbers with regex ([4, 2, 4, 3, 4])

Use re.findall to print the sum of every number embedded in the text.

Rotate a deque by 2 ([4, 2, 4, 3, 4])

Use collections.deque to rotate [4, 2, 4, 3, 4] right by 2 and print the result as a list.

Group numbers by parity ([4, 2, 4, 3, 4])

Use a defaultdict to group [4, 2, 4, 3, 4] into 'even' and 'odd' lists and print the dict.

Most common item with Counter ([8, 8, 2, 10])

Use collections.Counter to print the most common value in [8, 8, 2, 10] and its count, like `value count`.

gcd(7, 9) with math

Use math.gcd to print the greatest common divisor of 7 and 9.

Sum amounts from JSON ([8, 8, 2, 10])

Parse the JSON list of orders and print the total of the `amount` fields.

Extract numbers with regex ([8, 8, 2, 10])

Use re.findall to print the sum of every number embedded in the text.

Rotate a deque by 3 ([8, 8, 2, 10])

Use collections.deque to rotate [8, 8, 2, 10] right by 3 and print the result as a list.

Seeded dice roll (seed 2)

Seed random with 2, then print the sum of 3 dice rolls (random.randint(1,6)).

Group numbers by parity ([8, 8, 2, 10])

Use a defaultdict to group [8, 8, 2, 10] into 'even' and 'odd' lists and print the dict.

Most common item with Counter ([3, 5, 3, 5, 3])

Use collections.Counter to print the most common value in [3, 5, 3, 5, 3] and its count, like `value count`.

gcd(5, 10) with math

Use math.gcd to print the greatest common divisor of 5 and 10.

Sum amounts from JSON ([3, 5, 3, 5, 3])

Parse the JSON list of orders and print the total of the `amount` fields.

Extract numbers with regex ([3, 5, 3, 5, 3])

Use re.findall to print the sum of every number embedded in the text.

Rotate a deque by 4

Use collections.deque to rotate [3, 5, 3, 5, 3] right by 4 and print the result as a list.

Seeded dice roll (seed 8)

Seed random with 8, then print the sum of 4 dice rolls (random.randint(1,6)).

Group numbers by parity ([3, 5, 3, 5, 3])

Use a defaultdict to group [3, 5, 3, 5, 3] into 'even' and 'odd' lists and print the dict.

Most common item with Counter ([9, 9, 9, 2])

Use collections.Counter to print the most common value in [9, 9, 9, 2] and its count, like `value count`.

Factorial of 8 with math

Use math.factorial to print 8 factorial.

gcd(8, 28) with math

Use math.gcd to print the greatest common divisor of 8 and 28.

Sum amounts from JSON ([9, 9, 9, 2])

Parse the JSON list of orders and print the total of the `amount` fields.

Extract numbers with regex ([9, 9, 9, 2])

Use re.findall to print the sum of every number embedded in the text.

Rotate a deque by 2 ([9, 9, 9, 2])

Use collections.deque to rotate [9, 9, 9, 2] right by 2 and print the result as a list.

Seeded dice roll (seed 49)

Seed random with 49, then print the sum of 2 dice rolls (random.randint(1,6)).

Group numbers by parity ([9, 9, 9, 2])

Use a defaultdict to group [9, 9, 9, 2] into 'even' and 'odd' lists and print the dict.

Most common item with Counter ([6, 10, 6, 6, 2])

Use collections.Counter to print the most common value in [6, 10, 6, 6, 2] and its count, like `value count`.

gcd(4, 22) with math

Use math.gcd to print the greatest common divisor of 4 and 22.

Sum amounts from JSON ([6, 10, 6, 6, 2])

Parse the JSON list of orders and print the total of the `amount` fields.

Projects

71

Shopping cart total with 10% off

Sum the prices [20, 35, 15], apply a 10% discount, and print the total rounded to 2 decimals.

Gradebook average

Print the average of the scores [20, 35, 15] rounded to 1 decimal.

Bank net balance from transactions

The transactions [100, -30, 50, -20] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $90 bill 3 ways

Split a bill of 90 between 3 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 5)

Stock levels are [20, 35, 15]. Print how many are below the reorder threshold 5.

Receipt total with 10% tax

A subtotal of 90 has 10% tax added. Print the final total rounded to 2 decimals.

Most frequent word report

Print the most frequent word in 'go team go team win'.

Shopping cart total with 15% off

Sum the prices [88, 92, 79, 95], apply a 15% discount, and print the total rounded to 2 decimals.

Gradebook average ([88, 92, 79, 95])

Print the average of the scores [88, 92, 79, 95] rounded to 1 decimal.

Bank net balance from transactions ([88, 92, 79, 95])

The transactions [200, -50, -40] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $120 bill 4 ways

Split a bill of 120 between 4 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 10)

Stock levels are [88, 92, 79, 95]. Print how many are below the reorder threshold 10.

Receipt total with 15% tax

A subtotal of 120 has 15% tax added. Print the final total rounded to 2 decimals.

Most frequent word report ([88, 92, 79, 95])

Print the most frequent word in 'data data code data ship'.

Shopping cart total with 20% off

Sum the prices [10, 10, 10, 10], apply a 20% discount, and print the total rounded to 2 decimals.

Gradebook average ([10, 10, 10, 10])

Print the average of the scores [10, 10, 10, 10] rounded to 1 decimal.

Bank net balance from transactions ([10, 10, 10, 10])

The transactions [40, 40, -25] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $75 bill 5 ways

Split a bill of 75 between 5 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 8)

Stock levels are [10, 10, 10, 10]. Print how many are below the reorder threshold 8.

Receipt total with 20% tax

A subtotal of 75 has 20% tax added. Print the final total rounded to 2 decimals.

Most frequent word report ([10, 10, 10, 10])

Print the most frequent word in 'run fast run far run'.

Shopping cart total with 25% off

Sum the prices [70, 60, 90], apply a 25% discount, and print the total rounded to 2 decimals.

Gradebook average ([70, 60, 90])

Print the average of the scores [70, 60, 90] rounded to 1 decimal.

Bank net balance from transactions ([70, 60, 90])

The transactions [150, -100, 30, -20] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $100 bill 2 ways

Split a bill of 100 between 2 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 3)

Stock levels are [70, 60, 90]. Print how many are below the reorder threshold 3.

Receipt total with 25% tax

A subtotal of 100 has 25% tax added. Print the final total rounded to 2 decimals.

Most frequent word report ([70, 60, 90])

Print the most frequent word in 'save more save now save'.

Shopping cart total with 5% off

Sum the prices [45, 55, 65, 75], apply a 5% discount, and print the total rounded to 2 decimals.

Gradebook average ([45, 55, 65, 75])

Print the average of the scores [45, 55, 65, 75] rounded to 1 decimal.

Bank net balance from transactions ([45, 55, 65, 75])

The transactions [300, -120, -80] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $250 bill 6 ways

Split a bill of 250 between 6 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 20)

Stock levels are [45, 55, 65, 75]. Print how many are below the reorder threshold 20.

Receipt total with 5% tax

A subtotal of 250 has 5% tax added. Print the final total rounded to 2 decimals.

Most frequent word report ([45, 55, 65, 75])

Print the most frequent word in 'test then ship then test'.

Shopping cart total with 17% off

Sum the prices [21, 36, 16], apply a 17% discount, and print the total rounded to 2 decimals.

Gradebook average ([21, 36, 16])

Print the average of the scores [21, 36, 16] rounded to 1 decimal.

Bank net balance from transactions ([21, 36, 16])

The transactions [101, -29, 51, -19] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $97 bill 4 ways

Split a bill of 97 between 4 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 6)

Stock levels are [21, 36, 16]. Print how many are below the reorder threshold 6.

Receipt total with 17% tax

A subtotal of 97 has 17% tax added. Print the final total rounded to 2 decimals.

Shopping cart total with 22% off

Sum the prices [89, 93, 80, 96], apply a 22% discount, and print the total rounded to 2 decimals.

Gradebook average ([89, 93, 80, 96])

Print the average of the scores [89, 93, 80, 96] rounded to 1 decimal.

Bank net balance from transactions ([89, 93, 80, 96])

The transactions [201, -49, -39] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $127 bill 5 ways

Split a bill of 127 between 5 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 17)

Stock levels are [89, 93, 80, 96]. Print how many are below the reorder threshold 17.

Receipt total with 22% tax

A subtotal of 127 has 22% tax added. Print the final total rounded to 2 decimals.

Shopping cart total with 27% off

Sum the prices [11, 11, 11, 11], apply a 27% discount, and print the total rounded to 2 decimals.

Gradebook average ([11, 11, 11, 11])

Print the average of the scores [11, 11, 11, 11] rounded to 1 decimal.

Bank net balance from transactions ([11, 11, 11, 11])

The transactions [41, 41, -24] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $82 bill 6 ways

Split a bill of 82 between 6 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 9)

Stock levels are [11, 11, 11, 11]. Print how many are below the reorder threshold 9.

Receipt total with 27% tax

A subtotal of 82 has 27% tax added. Print the final total rounded to 2 decimals.

Shopping cart total with 32% off

Sum the prices [71, 61, 91], apply a 32% discount, and print the total rounded to 2 decimals.

Gradebook average ([71, 61, 91])

Print the average of the scores [71, 61, 91] rounded to 1 decimal.

Bank net balance from transactions ([71, 61, 91])

The transactions [151, -99, 31, -19] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $107 bill 3 ways

Split a bill of 107 between 3 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 4)

Stock levels are [71, 61, 91]. Print how many are below the reorder threshold 4.

Receipt total with 32% tax

A subtotal of 107 has 32% tax added. Print the final total rounded to 2 decimals.

Shopping cart total with 6% off

Sum the prices [46, 56, 66, 76], apply a 6% discount, and print the total rounded to 2 decimals.

Gradebook average ([46, 56, 66, 76])

Print the average of the scores [46, 56, 66, 76] rounded to 1 decimal.

Bank net balance from transactions ([46, 56, 66, 76])

The transactions [301, -119, -79] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $257 bill 7 ways

Split a bill of 257 between 7 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 27)

Stock levels are [46, 56, 66, 76]. Print how many are below the reorder threshold 27.

Receipt total with 6% tax

A subtotal of 257 has 6% tax added. Print the final total rounded to 2 decimals.

Shopping cart total with 24% off

Sum the prices [22, 37, 17], apply a 24% discount, and print the total rounded to 2 decimals.

Gradebook average ([22, 37, 17])

Print the average of the scores [22, 37, 17] rounded to 1 decimal.

Bank net balance from transactions ([22, 37, 17])

The transactions [102, -28, 52, -18] mix deposits (+) and withdrawals (−). Print the net balance.

Split a $104 bill 5 ways

Split a bill of 104 between 5 people. Print the per-person amount rounded to 2 decimals.

Count low-stock items (under 7)

Stock levels are [22, 37, 17]. Print how many are below the reorder threshold 7.

Receipt total with 24% tax

A subtotal of 104 has 24% tax added. Print the final total rounded to 2 decimals.

Expert

71

Decorator that scales by 2

Write a decorator that multiplies a function's result by 2. Decorate add(a,b) and print add(3,4).

Generator of squares to 10

Write a generator yielding the squares of 1..10 and print their sum.

Product with reduce

Use functools.reduce to print the product of [1, 2, 3, 4].

Memoized Fibonacci #10

Use @lru_cache to write fib(n) and print fib(10).

Count pairs from 5 items

Use itertools.combinations to print how many 2-item pairs come from a list of 5 items.

Closure counter to 2

Write a closure counter; call it 2 times and print the final value.

Running totals with accumulate

Use itertools.accumulate to print the running totals of [1, 2, 3, 4].

Decorator that scales by 3

Write a decorator that multiplies a function's result by 3. Decorate add(a,b) and print add(5,6).

Generator of squares to 12

Write a generator yielding the squares of 1..12 and print their sum.

Product with reduce ([2, 3, 4])

Use functools.reduce to print the product of [2, 3, 4].

Memoized Fibonacci #12

Use @lru_cache to write fib(n) and print fib(12).

Count pairs from 6 items

Use itertools.combinations to print how many 2-item pairs come from a list of 6 items.

Closure counter to 3

Write a closure counter; call it 3 times and print the final value.

Running totals with accumulate ([2, 3, 4])

Use itertools.accumulate to print the running totals of [2, 3, 4].

Decorator that scales by 5

Write a decorator that multiplies a function's result by 5. Decorate add(a,b) and print add(7,1).

Generator of squares to 8

Write a generator yielding the squares of 1..8 and print their sum.

Product with reduce ([5, 5, 2])

Use functools.reduce to print the product of [5, 5, 2].

Memoized Fibonacci #8

Use @lru_cache to write fib(n) and print fib(8).

Count pairs from 4 items

Use itertools.combinations to print how many 2-item pairs come from a list of 4 items.

Closure counter to 5

Write a closure counter; call it 5 times and print the final value.

Running totals with accumulate ([5, 5, 2])

Use itertools.accumulate to print the running totals of [5, 5, 2].

Decorator that scales by 4

Write a decorator that multiplies a function's result by 4. Decorate add(a,b) and print add(2,9).

Generator of squares to 15

Write a generator yielding the squares of 1..15 and print their sum.

Product with reduce ([1, 2, 3, 4, 5])

Use functools.reduce to print the product of [1, 2, 3, 4, 5].

Memoized Fibonacci #15

Use @lru_cache to write fib(n) and print fib(15).

Count pairs from 7 items

Use itertools.combinations to print how many 2-item pairs come from a list of 7 items.

Closure counter to 4

Write a closure counter; call it 4 times and print the final value.

Running totals with accumulate ([1, 2, 3, 4, 5])

Use itertools.accumulate to print the running totals of [1, 2, 3, 4, 5].

Decorator that scales by 10

Write a decorator that multiplies a function's result by 10. Decorate add(a,b) and print add(8,8).

Generator of squares to 9

Write a generator yielding the squares of 1..9 and print their sum.

Product with reduce ([10, 2, 3])

Use functools.reduce to print the product of [10, 2, 3].

Memoized Fibonacci #9

Use @lru_cache to write fib(n) and print fib(9).

Count pairs from 8 items

Use itertools.combinations to print how many 2-item pairs come from a list of 8 items.

Closure counter to 10

Write a closure counter; call it 10 times and print the final value.

Running totals with accumulate ([10, 2, 3])

Use itertools.accumulate to print the running totals of [10, 2, 3].

Decorator that scales by 3 ([2, 3, 4, 5])

Write a decorator that multiplies a function's result by 3. Decorate add(a,b) and print add(4,5).

Generator of squares to 17

Write a generator yielding the squares of 1..17 and print their sum.

Product with reduce ([2, 3, 4, 5])

Use functools.reduce to print the product of [2, 3, 4, 5].

Memoized Fibonacci #17

Use @lru_cache to write fib(n) and print fib(17).

Running totals with accumulate ([2, 3, 4, 5])

Use itertools.accumulate to print the running totals of [2, 3, 4, 5].

Decorator that scales by 4 ([3, 4, 5])

Write a decorator that multiplies a function's result by 4. Decorate add(a,b) and print add(6,7).

Generator of squares to 19

Write a generator yielding the squares of 1..19 and print their sum.

Product with reduce ([3, 4, 5])

Use functools.reduce to print the product of [3, 4, 5].

Memoized Fibonacci #19

Use @lru_cache to write fib(n) and print fib(19).

Running totals with accumulate ([3, 4, 5])

Use itertools.accumulate to print the running totals of [3, 4, 5].

Decorator that scales by 6

Write a decorator that multiplies a function's result by 6. Decorate add(a,b) and print add(8,2).

Product with reduce ([6, 6, 3])

Use functools.reduce to print the product of [6, 6, 3].

Closure counter to 6

Write a closure counter; call it 6 times and print the final value.

Running totals with accumulate ([6, 6, 3])

Use itertools.accumulate to print the running totals of [6, 6, 3].

Decorator that scales by 5 ([2, 3, 4, 5, 6])

Write a decorator that multiplies a function's result by 5. Decorate add(a,b) and print add(3,10).

Generator of squares to 22

Write a generator yielding the squares of 1..22 and print their sum.

Product with reduce ([2, 3, 4, 5, 6])

Use functools.reduce to print the product of [2, 3, 4, 5, 6].

Memoized Fibonacci #22

Use @lru_cache to write fib(n) and print fib(22).

Running totals with accumulate ([2, 3, 4, 5, 6])

Use itertools.accumulate to print the running totals of [2, 3, 4, 5, 6].

Decorator that scales by 17

Write a decorator that multiplies a function's result by 17. Decorate add(a,b) and print add(9,9).

Product with reduce ([11, 3, 4])

Use functools.reduce to print the product of [11, 3, 4].

Count pairs from 9 items

Use itertools.combinations to print how many 2-item pairs come from a list of 9 items.

Closure counter to 17

Write a closure counter; call it 17 times and print the final value.

Running totals with accumulate ([11, 3, 4])

Use itertools.accumulate to print the running totals of [11, 3, 4].

Decorator that scales by 4 ([3, 4, 5, 6])

Write a decorator that multiplies a function's result by 4. Decorate add(a,b) and print add(5,6).

Generator of squares to 24

Write a generator yielding the squares of 1..24 and print their sum.

Product with reduce ([3, 4, 5, 6])

Use functools.reduce to print the product of [3, 4, 5, 6].

Memoized Fibonacci #24

Use @lru_cache to write fib(n) and print fib(24).

Running totals with accumulate ([3, 4, 5, 6])

Use itertools.accumulate to print the running totals of [3, 4, 5, 6].

Decorator that scales by 5 ([4, 5, 6])

Write a decorator that multiplies a function's result by 5. Decorate add(a,b) and print add(7,8).

Generator of squares to 26

Write a generator yielding the squares of 1..26 and print their sum.

Product with reduce ([4, 5, 6])

Use functools.reduce to print the product of [4, 5, 6].

Memoized Fibonacci #26

Use @lru_cache to write fib(n) and print fib(26).

Running totals with accumulate ([4, 5, 6])

Use itertools.accumulate to print the running totals of [4, 5, 6].

Decorator that scales by 7

Write a decorator that multiplies a function's result by 7. Decorate add(a,b) and print add(9,3).

Product with reduce ([7, 7, 4])

Use functools.reduce to print the product of [7, 7, 4].