Functions in Python: Basics to Advanced

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Functions in Python: Basics to Advanced

Functions are a cornerstone of Python programming. They allow you to organize code into reusable blocks, improving readability, maintainability, and efficiency.

Basics of Functions

A function in Python is defined using the def keyword:

python

def greet(name):

return f"Hello, {name}!"

You call this function with an argument: greet("Alice") returns "Hello, Alice!". Functions can have default parameters, allowing flexibility:

python

def greet(name="Guest"):

return f"Hello, {name}!"

Arguments & Return Values

Python functions can take positional, keyword, variable-length arguments (*args, **kwargs), and return multiple values:

python

def process_data(*args, **kwargs):

return args, kwargs

Lambda Functions

For small, anonymous functions, use lambda:

python

square = lambda x: x**2

Useful in sorting or filtering data, lambdas keep your code concise.

Advanced Concepts

1. First-Class Functions

Functions in Python can be passed around as arguments:

python

def apply(func, value):

return func(value)

2. Closures & Decorators

Closures remember the environment in which they were created, enabling decorators — powerful tools for modifying behavior:

python

def decorator(func):

def wrapper():

print("Before")

func()

print("After")

return wrapper

3. Recursion

A function calling itself is useful in tasks like factorial or tree traversal:

python

def factorial(n):

return 1 if n == 0 else n * factorial(n-1)

From simple greeting functions to complex decorators and recursion, mastering functions is essential for writing clean, efficient Python code. 

Read More

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