Functions in Python

What is a Function?

• A function is a block of reusable code that performs a specific task.

Why Use Function?

• Reuse code multiple times

• Improve code readability

• Reduce code duplication

• Make programs easier to maintain

Syntax:

def function_name():
    <statement>

Example:

def greet():
    print("Hello, Python!")

greet()

Output:

Hello, Python!

Three types of Functions:

• Function without Parameters

• Function with Parameters

• Function with return values

Function without Parameters:

A function that does not accept any input values is called a function without parameters.

Example:

def greet():
     print("Hello, Python!")

greet()

Output:

Hello, Python!

Function with Parameters:

A function that accepts input values is called a function with parameters.

Syntax:

def function_name(parameter):
     <statement>

Example:

def greet(name):
     print("Hello", name)

greet("World")

Output:

Hello World

Function with Return Value:

A function that returns a values using the return statement.

Example:

def add(a, b):
    return a + b

result = add(10,20)
print(result)

Output:

30