Summary
- Python global variables allow data to be shared throughout a program but overuse can lead to bugs and complex code.
- Python searches for variables from local to global, and built-in, which adheres to the LEGB rule (Local, Enclosing, Global, and Built-in).
- To modify a variable inside a function, use the global keyword, but prefer passing arguments or using classes for alternatives.
- Best practices recommend using global variables only for application-wide configuration, shared constants, or small scripts.
- For functional programming and module-design, prefer passing arguments and returning values to avoid global variable side effects.
- Using classes and modules as singletons is a cleaner approach for managing shared state and behavior compared to global variables.
- For nested functions and closures, using nonlocal variables is preferred over global variables to encapsulate state.
- In summary, sparingly use global variables for specific reasons and follow best practices, and consider alternative designs to simplify code.
By Fromdev Publisher
Original Article