Python return Statement

Python Docs

All functions return a value when called.

If a return statement is followed by an expression list, that expression list is evaluated and the value is returned:

>>> def greater_than_1(n):
...     return n > 1
...
>>> print(greater_than_1(1))
False
>>> print(greater_than_1(2))
True

If no expression list is specified, None is returned:

>>> def no_expression_list():
...     return    # No return expression list.
...
>>> print(no_expression_list())
None

If a return statement is reached during the execution of a function, the current function call is left at that point:

>>> def return_middle():
...     a = 1
...     return a
...     a = 2     # This assignment is never reached.
...
>>> print(return_middle())
1

If there is no return statement the function returns None when it reaches the end:

>>> def no_return():
...     pass     # No return statement.
...
>>> print(no_return())
None

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