Python functions are reusable blocks of code that perform specific tasks. They help organize your code, make it more readable, and reduce repetition. Here's what you need to know to get started:

What is a Function?

A function is like a mini-program within your program. It takes some input (optional), does something with it, and returns an output (also optional).

Basic Syntax

def function_name(parameters):
    # Function body
    # Code to be executed
    return result  # Optional

Key Components

• def keyword: This tells Python you're defining a function.
• function_name: Choose a descriptive name for your function.
• parameters: Input values the function can work with (optional).
• function body: The indented block of code that does the work.
• return statement: Specifies what the function should output (optional).

Example

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

# Using the function
message = greet("Alice")
print(message)  # Output: Hello, Alice!

Functions make your code more modular, easier to understand, and simpler to maintain. As you progress, you'll learn about more advanced concepts like default parameters, keyword arguments, and lambda functions.

Links

Python Lambda

Python Functions