Functions

Increases readability, Reduces code length, Increases reusability, Allows work division among team members

Functions provide multiple advantages: they make code more readable, reduce repetition, allow reuse of code, and enable team collaboration. They do not make programs slower.

Local scope

Variables defined inside a function have local scope, meaning they can only be accessed within that function and exist only while the function executes.

Built-in functions, User-defined functions, Module functions

Python has built-in functions (like print(), input()), user-defined functions (created by programmers), and module functions (from imported modules). System functions is not a recognized category.

global

The 'global' keyword is used inside a function to declare that a variable refers to the global variable, allowing modification of the global variable from within the function.