What is functions?

Functions in Python are reusable blocks of code that perform a specific task. They help organize code, reduce repetition, and improve readability.

Defining a Function

You define a function using the def keyword, followed by the function name and parentheses. Any parameters the function takes are listed inside the parentheses.

def greet(name):
    print(f"Hello, {name}!")

Calling a Function

To use the function, you call it by its name and provide any necessary arguments.

greet("Guys")  # Output: Hello, Guys!

Default Parameters

You can assign default values to parameters.

def greet(name="World"):
    print(f"Hello, {name}!")

greet()        # Output: Hello, World!
greet("Sheetal Mathur")  # Output: Hello, Sheetal Mathur!

Return Statement

Functions can return values using the return keyword.

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

result = add(3, 4)  # result is now 7

Parameters and Arguments

Parameters are the variables listed in a function’s definition.

Arguments are the values you pass to the function when you call it.