Introduction

This lesson is part of our complete Python course for beginners. In this lesson, you will learn functions in Python and how to use them to organize and reuse code.

Understanding functions in Python is important because they help you write clean and efficient programs.

What are Functions in Python?

Functions in Python are blocks of code that perform a specific task. They help you reuse code instead of writing the same logic multiple times.

Creating a Function in Python

You can create a function using the def keyword.

Example:

def greet(): print(“Hello, Welcome to Python”)

Calling a Function

To execute a function, you need to call it.

Example:

greet()

Functions with Parameters

Functions can take input values called parameters.

Example:

def greet(name): print(“Hello”, name)

Functions with Return Values

Functions can return values using the return keyword.

Example:

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

Types of Functions in Python

• Built-in Functions
• User-defined Functions
• Lambda Functions

Why Functions are Important

Functions in Python help you:

• Reduce code duplication
• Improve readability
• Organize code efficiently

Therefore, understanding functions in Python is essential for writing scalable programs.

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Conclusion

Now you understand functions in Python and how to create and use them effectively.

In the next lesson, you will learn about data structures in Python.

Next Lesson

Data Structures in Python