8.2. Function Return¶

8.2.1. Syntax¶

def my_function():
    return <expression>

def mean():
    return (1+2) / 2

def add():
    a = 1
    b = 2
    return a + b

8.2.2. Return Keyword¶

return keyword indicates outcome of the function

Code after return will not execute

def hello():
    return 'ehlo world'

print(hello())
# 'ehlo world'

def hello():
    return 'ehlo world'
    print('This will not be executed')

print(hello())
# 'ehlo world'

8.2.3. Return Basic Type¶

def my_function():
    return 42

def my_function():
    return 13.37

def my_function():
    return 'Mark Watney'

def my_function():
    return True

8.2.4. Return Sequence¶

def my_function():
    return list([42, 13.37, 'Mark Watney'])

def my_function():
    return [42, 13.37, 'Mark Watney']

def my_function():
    return tuple((42, 13.37, 'Mark Watney'))

def my_function():
    return (42, 13.37, 'Mark Watney')

def my_function():
    return 42, 13.37, 'Mark Watney'

def my_function():
    return set({42, 13.37, 'Mark Watney'})

def my_function():
    return {42, 13.37, 'Mark Watney'}

def my_function():
    return frozenset({42, 13.37, 'Mark Watney'})

8.2.5. Return Mapping¶

def my_function():
    return dict(firstname='Mark', lastname='Watney')

def my_function():
    return {'firstname': 'Mark', 'lastname': 'Watney'}

8.2.6. Return Nested Sequence¶

def my_function():
    return [
        ('Mark', 'Watney'),
        {'Jan Twardowski', 'Melissa Lewis'},
        {'astro': 'Иванович', 'agency': {'name': 'Roscosmos'}},
        {'astro': 'Jiménez', 'missions': ('Mercury', 'Gemini', 'Apollo')},
        {'astro': 'Vogel', 'missions': (list(), tuple(), set(), frozenset())},
    ]

8.2.7. Return None¶

Python will return None if no explicit return is specified

def my_function():
    return None

def my_function():
    print('ehlo world')

def my_function():
    pass

def my_function():
    """My function"""

8.2.8. Intercept returned value¶

def my_function():
    return 1


result = my_function()
print(result)
# 1

8.2.9. Assignments¶

8.2.9.1. Function Return Numbers¶

Assignment name: Function Return Numbers
Last update: 2020-10-01
Complexity level: easy
Lines of code to write: 4 lines
Estimated time of completion: 3 min
Solution: solution/function_return_numbers.py

English

Define function add without parameters
Function should return sum of 1 and 2
Call function and intercept returned value
Print value

Polish

Zdefiniuj funkcję add bez parametrów
Funkcja powinna zwracać sumę 1 i 2
Wywołaj funkcję i przechwyć zwracaną wartość
Wyświetl wartość