Python def function

Python def function full form is User-Defined Functions. Where the def keyword is used to define a function.

def function_name: 
    statements...

Or

def function_name(arguments):
    # function body 

    return

• def – keyword used to declare a function
• function_name – any name given to the function
• arguments – any value passed to function
• return (optional) – returns a value from a function

Python def function example

Simple example code where a function doesn’t have any arguments and doesn’t return any values.

def greet():
    print('Hello World! Def function')

greet()

Output:

Define Python Function with Arguments

def add_numbers(num1, num2):
    sum = num1 + num2
    print('Sum: ', sum)


add_numbers(100, 200)

Output: Sum: 300

Function with return Statement

If we want our function to return some value then use the return statement.

def find_square(num):
    result = num * num
    return result

square = find_square(3)

print('Square:',square)

Do comment if you have any doubts or suggestions on this Python basic topic.

Note: IDE: PyCharm 2021.3.3 (Community Edition)

Windows 10

Python 3.10.1

All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.