Python User-defined functions

All the functions that are written by any of us come under the category of user-defined functions. Below are the steps for writing user-defined functions in Python.

• In Python, a def keyword is used to declare user-defined functions. 
• An indented block of statements follows the function name and arguments which contains the body of the function. 

Syntax:

def function_name():
    statements
    .
    .

Example: Here we have created the fun function and then called the fun() function to print the statement.

Output: 

Inside function

A function is a set of statements that take inputs, do some specific computation, and produce output. The idea is to put some commonly or repeatedly done tasks together and make a function so that instead of writing the same code again and again for different inputs, we can call the function. Functions that readily come with Python are called built-in functions. Python provides built-in functions like print(), etc. but we can also create your own functions. These functions are known as user defines functions.

Table of Content 

• User defined functions 
• Parameterized functions 
  • Default arguments 
  • Keyword arguments  
  • Variable length arguments  
  • Pass by Reference or pass by value? 
     
• Function with return value