test_os.py 文件源码

def test_stty_match(self):
        """Check if stty returns the same results

        stty actually tests stdin, so get_terminal_size is invoked on
        stdin explicitly. If stty succeeded, then get_terminal_size()
        should work too.
        """
        try:
            size = subprocess.check_output(['stty', 'size']).decode().split()
        except (FileNotFoundError, subprocess.CalledProcessError):
            self.skipTest("stty invocation failed")
        expected = (int(size[1]), int(size[0])) # reversed order

        try:
            actual = os.get_terminal_size(sys.__stdin__.fileno())
        except OSError as e:
            if sys.platform == "win32" or e.errno in (errno.EINVAL, errno.ENOTTY):
                # Under win32 a generic OSError can be thrown if the
                # handle cannot be retrieved
                self.skipTest("failed to query terminal size")
            raise
        self.assertEqual(expected, actual)