Undeclared dependency `six`

[parthea]

six is used in the code but is not explicitly listed as a dependency resulting in runtime errors in environments where it is not already installed.

google-cloud-python-happybase/src/google/cloud/happybase/batch.py

Line 21 in c4b03fa

import six

google-cloud-python-happybase/setup.py

Line 55 in c4b03fa

REQUIREMENTS = ["google-cloud-bigtable >= 0.31.0"]

See build log here

==================================== ERRORS ====================================
__________ ERROR collecting samples/quickstart_happybase/main_test.py __________
ImportError while importing test module '/workspace/samples/quickstart_happybase/main_test.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/local/lib/python3.7/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
main_test.py:21: in <module>
    from main import main
main.py:20: in <module>
    from google.cloud import happybase
.nox/py-3-7/lib/python3.7/site-packages/google/cloud/happybase/__init__.py:156: in <module>
    from google.cloud.happybase.batch import Batch
.nox/py-3-7/lib/python3.7/site-packages/google/cloud/happybase/batch.py:21: in <module>
    import six
E   ModuleNotFoundError: No module named 'six'