test_os.py 文件源码

def test_yields_correct_dir_fd(self):
        # check returned file descriptors
        for topdown, follow_symlinks in itertools.product((True, False), repeat=2):
            args = support.TESTFN, topdown, None
            for root, dirs, files, rootfd in os.fwalk(*args, follow_symlinks=follow_symlinks):
                # check that the FD is valid
                os.fstat(rootfd)
                # redundant check
                os.stat(rootfd)
                # check that listdir() returns consistent information
                self.assertEqual(set(os.listdir(rootfd)), set(dirs) | set(files))