flake8-mutable

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library 1.2.0 ·python
verified Apr 16, 2026

flake8-mutable is a linter extension for Flake8 that identifies and flags the use of mutable objects as default arguments in Python function definitions. This helps prevent common and often unexpected bugs where mutations to the default argument persist across function calls. The current version is 1.2.0. The project appears to be stable with infrequent updates, having been last released in 2017.

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