# Python # side effect #

Published: 30 April 2025
on channel: ♥Python♥

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A side effect in Python, within the context of functions, refers to any modification a function makes that persists beyond its execution scope. This means the function alters something outside of its local variables or return value. Common examples of side effects include:
Modifying mutable objects passed as arguments:
If a function receives a list or dictionary as input and changes its contents, this change is a side effect because it affects the original object outside the function.
Changing global variables:
When a function modifies a variable declared outside its scope, it creates a side effect that can impact other parts of the program.
Performing I/O operations:
Actions like printing to the console, writing to a file, or making network requests are side effects because they interact with the external environment.
Side effects can make code harder to understand, debug, and test, as they introduce dependencies and make it difficult to isolate the behavior of individual functions. While side effects are sometimes necessary, minimizing them and making them explicit can improve code quality and maintainability.

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