Hi all, I wrote a small static analyser which can catch stuff like: def foo(a, b): return a*b foo(123) ## error: wrong number of arguments class Foo(): def __init__(self, a): self.a = a def bar(self, c): print(self.a) ## OK return self.c ## error, because self.c never assigned Foo() ## error: wrong number of arguments in init You can find it here: https://github.com/JohannesBuchner/pystrict3 and install as usual: pip3 install pystrict3 pystrict3.py myfile.py It further asserts a strict subset of Python, where you are not allowed to mangle the internals nor re-assign variables. Perhaps some can find it useful for writing more obvious code. It can be used additional to pyflakes, pylint, flake8, etc. Let me know any feedback, bugs, etc., and whether you think it is a stupid or interesting idea. Cheers, Johannes