Python Return Statement


title: 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

A single function can have multiple return statements. Execution of the function ends when one of these return statements is reached:

>>> def multiple_returns(n): ... if(n): ... return "First Return Statement" ... else: ... return "Second Return Statement" ... >>> print(multiple_returns(True)) First Return Statement >>> print(multiple_returns(False)) Second Return Statement

A single function can return various types:

>>> def various_return_types(n): ... if(n==1): ... return "Hello World." # Return a string ... elif(n==2): ... return 42 # Return a value ... else: ... return True # Return a boolean ... >>> print(various_return_types(1)) Hello World. >>> print(various_return_types(2)) 42 >>> print(various_return_types(3)) True

It is even possible to have a single function return multiple values with only a single return:

>>> def return_two_values(): ... a = 40 ... b = 2 ... return a,b ... >>> print("First value = %d, Second value = %d" %(return_two_values())) First value = 40, Second value = 2

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