Python lets you set default values for function arguments, which is super convenient. But when those default values are mutable (like lists or dictionaries), you're walking into a sneaky bug trap.

Take advantage of caching and the lru_cache decorator to relieve your Python functions from repetitive heavy lifting.

Python Functions: Python Functions, Function Argument, Python Recursion Anonymous Function, Global, Local and Nonlocal, Python Global Keyword, Python Modules, Python Package.