self = 
def test_build_api_url_w_extra_query_params(self):
    from urllib.parse import parse_qsl
    from urllib.parse import urlsplit


  conn = self._make_one(object())


tests/unit/test__http.py:63:

tests/unit/test__http.py:28: in _make_one

return self._get_target_class()(*args, **kw)

tests/unit/test__http.py:23: in _get_target_class

from google.cloud.dns._http import Connection

google/cloud/dns/init.py:32: in 

from google.cloud.dns.zone import Changes

google/cloud/dns/zone.py:18: in 

from google.cloud._helpers import _rfc3339_to_datetime

"""

from __future__ import absolute_import

import calendar
import datetime
import os
import re
from threading import local as Local


import six

E   ModuleNotFoundError: No module named 'six'

.nox/unit-3-7/lib/python3.7/site-packages/google/cloud/_helpers.py:28: ModuleNotFoundError