Making ast.walk 220x Faster

I appreciate that you first tried to optimize the original Python code. Idiomatic Python is unfortunately disappointingly slow and not so interesting to compare to.

Could this ast.sprint ast.walk optimization make libCST or bandit faster? https://news.ycombinator.com/item?id=39111747

libCST: https://github.com/Instagram/LibCST

bandit: https://github.com/PyCQA/bandit

Links to codemod tools; "Baby Steps into Genetic Programming" https://news.ycombinator.com/item?id=43617655

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