Function in Python

 

Python Functions are a group of connected statements that are used to accomplish a computational, logical, or evaluative activity in Python. The goal is to group together certain often performed actions and create a function, so that instead of writing the same code over and over for different inputs, we may call the function and reuse the code contained within it.

 

Built-in and user-defined functions are both possible. It contributes in maintaining the programme simple, non-repetitive, and well-organized.

Types of Functions in Python

Built –in Function

Python provides a number of functions that may be used directly. These are referred to as built-in functions. Most of Python's built-in functions are included on this reference page. Click Here

User Defined Function

User-defined functions are functions that we define ourselves to do a certain purpose. We've already spoken about how to define and call functions in Python.

Built-in functions are functions that come pre-installed with Python. Library functions are when we employ functions written by others in the form of a library.

User-defined functions include all other functions that we create on our own. As a result, our user-defined function might be considered a library function by others.

Syntax

def function_name(parameters):     """docstring"""     statement(s)     return expression

 

Creating a Function

The def keyword can be used to build a Python function.

Example:

# Write a Program to Creating a Function in Python   def run(): print("Welcome to www.a2pstudy.blogspot.com")

Calling a Function

After constructing a function, we may call it by using the function's name followed by parentheses holding the function's parameters.

Example:

# Write a Program to Creating/Calling a Function in Python   def run(): print("Welcome to www.a2pstudy.blogspot.com ")                         # call a function run()

Output Welcome to www.a2pstudy.blogspot.com

 

Function with Arguments

The values given inside the function's parentheses are referred to as arguments. Any number of parameters can be separated by a comma in a function.

Example:

# Write a Program to illustrate Function with Argument.     def evenOdd(x):             if (x % 2 == 0):                         print("even")             else:                         print("odd")     # call the function evenOdd(2) evenOdd(3)

Output even odd

 

Types of Arguments

Python supports various types of arguments that can be passed at the time of the function call. Let’s discuss each type in detail.

1. Default arguments
2. Keyword arguments
3. Variable-length arguments
• *args (Non-Keyword Arguments)
• **kwargs (Keyword Arguments)