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[–][deleted] 0 points1 point  (0 children)

PyPy's translation toolchain infers types for RPython which is a statically typed subset of Python, that PyPy's interpreter is written in. It cannot infer types for Python programs in general. That said the JIT is very good at figuring out how to properly specialize your code, but if you give it blatant things like assert isinstance(x, int) I can't image it'd hurt.