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Boolean expression performs redundant bool check #3567

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dimpolo opened this issue Mar 11, 2022 · 0 comments

dimpolo commented Mar 11, 2022

n = 0

class Test:
    def __bool__(self):
        global n
        n += 1
        return False

Test() and False or False
assert n == 1

CPython optimizes this check in:
https://github.com/python/cpython/blob/54ab9ad312ea53db40e31712454272e1d4c0315f/Python/compile.c#L8708-L8721

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