OSError: [WinError 123] The filename, directory name, or volume label syntax is incorrect

System Info :

Python version : 3.6.10
OS : Windows 10 (64 bit)

Running pytest -n auto --disable-warnings wmt19_test.py gives me error which is unexpected :

_____________________________ TranslateDeEnWmt19Test.test_download_and_prepare_as_dataset _____________________________
[gw1] win32 -- Python 3.6.10 c:\users\eshan\anaconda3\envs\keras-gpu\python.exe
..\testing\dataset_builder_testing.py:153: in setUp
    super(DatasetBuilderTestCase, self).setUp()
C:\Users\eshan\Desktop\updates tfds\datasets\tensorflow_datasets\testing\test_case.py:71: in setUp
    ???
c:\users\eshan\anaconda3\envs\keras-gpu\lib\site-packages\tensorflow_core\python\platform\test.py:76: in get_temp_dir
    return _googletest.GetTempDir()
c:\users\eshan\anaconda3\envs\keras-gpu\lib\site-packages\tensorflow_core\python\platform\googletest.py:78: in GetTempDir
    temp_dir = tempfile.mkdtemp(prefix=temp_dir.rstrip('.py'))
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

suffix = '', prefix = 'C:\\Users\\eshan\\AppData\\Local\\Temp\\<string>', dir = 'C:\\Users\\eshan\\AppData\\Local\\Temp'

    def mkdtemp(suffix=None, prefix=None, dir=None):
        """User-callable function to create and return a unique temporary
        directory.  The return value is the pathname of the directory.

        Arguments are as for mkstemp, except that the 'text' argument is
        not accepted.

        The directory is readable, writable, and searchable only by the
        creating user.

        Caller is responsible for deleting the directory when done with it.
        """

        prefix, suffix, dir, output_type = _sanitize_params(prefix, suffix, dir)

        names = _get_candidate_names()
        if output_type is bytes:
            names = map(_os.fsencode, names)

        for seq in range(TMP_MAX):
            name = next(names)
            file = _os.path.join(dir, prefix + name + suffix)
            try:
>               _os.mkdir(file, 0o700)
E               OSError: [WinError 123] The filename, directory name, or volume label syntax is incorrect: 'C:\\Users\\eshan\\AppData\\Local\\Temp\\<string>5o7k42t8'

c:\users\eshan\anaconda3\envs\keras-gpu\lib\tempfile.py:370: OSError

Start by reproducing pytest -n auto --disable-warnings wmt19_test.py on Windows, then trace setup through testing/dataset_builder_testing.py and tensorflow_datasets/testing/test_case.py using the reported stack trace. Compare the temporary-directory behavior around tensorflow_core/python/platform/googletest.py and Python's tempfile.py; done means the reported WinError no longer occurs in this test run.