What is the function of “def” in Python?

In Python, the keyword ‘def’ is used to define a function, which is a reusable block of code designed to perform a specific task. By defining functions, code can be modularized, thereby enhancing its readability and maintainability.

The “def” keyword is followed by the function’s name to identify the function. The function name should typically be descriptive to better understand the function’s purpose. Immediately following the function name are a pair of parentheses used to pass the function’s arguments. Arguments are the inputs needed for the function to execute.

A function body consists of an indented code block that defines the specific operations of the function. A function can execute any number of statements, include various control structures (such as if statements, loops, etc.), and call other functions. It can perform operations, calculate results, and return the results back to the function caller through a return value.

By defining functions, code can be broken down into smaller, more manageable parts, improving code reusability and maintainability. Functions also increase the level of abstraction in code, making it easier to understand and read.