test_statistics.py 文件源码

def test_has_exception(self):
        errmsg = (
                "Expected StatisticsError to be a ValueError, but got a"
                " subclass of %r instead."
                )
        self.assertTrue(hasattr(statistics, 'StatisticsError'))
        self.assertTrue(
                issubclass(statistics.StatisticsError, ValueError),
                errmsg % statistics.StatisticsError.__base__
                )


# === Tests for private utility functions ===