[Tut] Return Keyword in Python – A Simple Illustrated Guide

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Return Keyword in Python – A Simple Illustrated Guide



Python’s

Code:

return

keyword commands the execution flow to exit a function immediately and return a value to the caller of the function. You can specify an optional return value—or even a return expression—after the

Code:

return

keyword. If you don’t provide a return value, Python will return the default value

Code:

None

to the caller.

Python Return Keyword Video



Return Keyword Followed by Return Value

Here’s an example of the return keyword in combination with a return value:

Code:

def f(): return 4 print(f()) # OUTPUT: 4

Within function

Code:

f()

, Python returns the result 4 to the caller. The

Code:

print()

function then prints the output to the shell.

Return Keyword Followed by Return Expression

Here’s an example of the return keyword in combination with a return expression:

Code:

def f(): return 2+2 print(f()) # OUTPUT: 4

Within function

Code:

f()

, Python evaluates the expression

Code:

2+2=4

and returns the result 4 to the caller. The

Code:

print()

function then prints the output to the shell.

Return Keyword Followed by No Value

Here’s an example of the return keyword without defining a return value:

Code:

def f(): return print(f()) # OUTPUT: None

Within function

Code:

f()

, Python returns the default value

Code:

None

to the caller. The

Code:

print()

function then prints the output to the shell.

Interactive Code Shell

Run the following code in your browser:

https://trinket.io/embed/python/e0d733e100

Exercise: Change the three return values to 42, 42, and ‘Alice’ in the interactive code shell!

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