test_richcmp.py 文件源码

def test_not(self):
        # Check that exceptions in __bool__ are properly
        # propagated by the not operator
        import operator
        class Exc(Exception):
            pass
        class Bad:
            def __bool__(self):
                raise Exc

        def do(bad):
            not bad

        for func in (do, operator.not_):
            self.assertRaises(Exc, func, Bad())