Python Functions 

🔍 What is a Python Function?

A Python function is a block of reusable code that performs a specific task. Functions help make your program more organized, readable, and efficient.

In simple words, instead of writing the same code again and again, you can define a function and reuse it whenever needed.

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✨ Why Use Functions in Python?

• ✅ Reduces code duplication
• ✅ Improves readability
• ✅ Makes debugging easier
• ✅ Saves development time
• ✅ Supports modular programming

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🧠 Syntax of Python Function

def function_name(parameters):
    """Docstring (optional)"""
    statement(s)
    return value

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📌 Example of a Simple Function

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

greet()

👉 Output:

Hello, Welcome to Python!

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🔢 Function with Parameters

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

result = add(5, 3)
print(result)

👉 Output:

8

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🔄 Types of Functions in Python

1. Built-in Functions

These are already available in Python.

Examples:

print()
len()
type()

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2. User-defined Functions

Functions created by the user.

def square(x):
    return x * x

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3. Lambda Functions (Anonymous Functions)

square = lambda x: x * x
print(square(4))

👉 Output:

16

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🔁 Function with Default Parameters

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

greet()
greet("Prathima")

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📥 Function with Return Value

def multiply(a, b):
    return a * b

print(multiply(4, 5))

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📦 Advantages of Python Functions

• ✔ Code Reusability
• ✔ Better Organization
• ✔ Easy Maintenance
• ✔ Faster Development

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🚀 Conclusion

Python functions are one of the most important concepts in programming. Mastering functions will help you write efficient, clean, and reusable code. Whether you're a beginner or advanced learner, functions are essential for building real-world applications.

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🔑 Keywords

Python functions, Python function examples, user-defined functions in Python, Python programming basics, Python tutorial for beginners, lambda functions Python, Python coding guide

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