Web Reference: Mar 27, 2026 · Variables store data in memory and scope defines the specific region of a program where a variable is accessible. It dictates the visibility and lifetime of the variable within the source code. Variables are categorized into two primary scopes: Global and Local: Local Variables Local variables are defined inside a function and exist only during its execution. They cannot be accessed from ... Variables that are created outside of a function (as in all of the examples in the previous pages) are known as global variables. Global variables can be used by everyone, both inside of functions and outside. In this tutorial, you'll learn how to use global variables in Python functions using the global keyword or the built-in globals () function. You'll also learn a few strategies to avoid relying on global variables because they can lead to code that's difficult to understand, debug, and maintain.
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