Python Return Keyword (Return Multiple Values)Use the return keyword to return values from methods. Return multiple values in a tuple.
This is a Python keyword. We use return to signal the end of a method. We can place one or more return values in a method—they are executed when encountered.Built-ins
In Python, we find different terms for things like "void" methods. And for "no value" we have the special None value. Tuples can return multiple things at once.
No return value.
Methods in Python do not need to return a value. If we use the "return" statement alone, no value is returned. This is called a void method in other languages.
Note: Clarity of code is important. Sometimes, having more symmetry in a method (where "return" is used for all paths) is a clearer design.
Python program that returns no value
def printname(first, middle, last):
# Validate middle initial length.
if len(middle) != 1:
print("Middle initial too long")
print(first + " " + middle + ". " + last)
# Call method.
printname("Jake", "R", "Chambers")
Jake R. Chambers
When a method has no return value specified, and it terminates, the None value is returned. We can test for None. Here, example() returns None unless "x" is greater than zero.None
Python program that returns None
# Return a value only if argument is greater than zero.
if x > 0:
Return multiple values.
A tuple is a small container for more than one value. We can return 2 or more values from a method at once with a tuple. These values can be unpacked.Tuple
Python program that returns multiple values
def get_names_uppercase(a, b):
# This method returns 2 strings in a tuple.
return (a.upper(), b.upper());
# Get tuple from the method.
result = get_names_uppercase("vidiadhar", "naipaul")
# Extract first and second return values.
first = result
second = result
The return keyword is an essential part of Python programs. With it we direct the flow of control. We can return multiple values with a special type like a tuple.Def
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