Functions · Lesson 11 of 25

Functions with def

Write code once, use it many times.

8 minutes3 games

def defines a function: its name, inputs in ( ), then : and an indented body. return gives back the result. Inputs can have defaults: def greet(name="friend").

Python

def area(width, height):
    return width * height

def greet(name="friend"):
    return f"Hello, {name}!"

print(area(4, 5))
print(greet("Salma"))
print(greet())

Arguments

Function body

Return value

Quick question

What does a function without return give back?

Complete the code

Complete the function that returns double the number.

 double(n):
     n * 2

Exercise

Write is_even(n) returning True for even numbers, then print is_even(10).

Expected output: True

Python

def is_even(n):

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Python

Functions · Lesson 11 of 25

Functions with def

Write code once, use it many times.

8 minutes3 games

def defines a function: its name, inputs in ( ), then : and an indented body. return gives back the result. Inputs can have defaults: def greet(name="friend").

Python

def area(width, height):
    return width * height

def greet(name="friend"):
    return f"Hello, {name}!"

print(area(4, 5))
print(greet("Salma"))
print(greet())

Arguments

Function body

Return value

Quick question

What does a function without return give back?

Complete the code

Complete the function that returns double the number.

 double(n):
     n * 2

Exercise

Write is_even(n) returning True for even numbers, then print is_even(10).

Expected output: True

Python

def is_even(n):

Learn more from

Played 0 of 3 games