test_cmath.py 文件源码

def test_polar_errno(self):
        # Issue #24489: check a previously set C errno doesn't disturb polar()
        from _testcapi import set_errno
        def polar_with_errno_set(z):
            set_errno(11)
            try:
                return polar(z)
            finally:
                set_errno(0)
        self.check_polar(polar_with_errno_set)