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.

But Cython can also be used to incrementally accelerate Python functions, chiefly ones that perform math. The downside is that Cython uses its own peculiar syntax to work its magic, so porting ...