Functions in Python

In Python, a function is a block or group of code designed to complete a specific task. It allows for code reuse, so you can write code once and use it multiple times. Functions are used to divide complex problems into smaller pieces, making the code easier to read, understand, and maintain.

Code reusability, makes code smaller and simpler, easier to read and understand, and provides modularity.

A function in Python is defined using the `def` keyword. After the function name, there are parentheses `()` for parameters, followed by a colon `:`. The function body (code) is then indented.

Built-in Functions: Python provides many pre-defined functions that you can use directly without defining them, such as `print()`, `len()`, `type()`, etc.

User-defined Functions: These are functions that the programmer defines to complete specific tasks.

Simple functions (no parameters, no return), Parameterized functions, Functions with a return value, Functions with default parameters, Functions with keyword arguments, Functions with arbitrary parameters (`*args`), and Lambda functions (small anonymous functions).