cannot import name 'mtls'

This appears to be a bug with version 1.9 caused by https://github.com/googleapis/google-api-python-client/pull/917

Environment details

• OS type and version: OS X 10.15.4
• Python version: 3.6.10
• pip version: 20.0.02
• google-api-python-client version: 1.9.1

Steps to reproduce

1. python -c “import googleapiclient.discovery”

Stack trace

----> 1 import googleapiclient.discovery

~/miniconda3/envs/surround-cp/lib/python3.6/site-packages/googleapiclient/discovery.py in <module>
     48 import uritemplate
     49 import google.api_core.client_options
---> 50 from google.auth.transport import mtls
     51 from google.auth.exceptions import MutualTLSChannelError
     52

ImportError: cannot import name 'mtls'

[arithmetic1728]

@A-Sm1th I tested google-auth 1.17.2 and it worked fine.

(tmp) $ python -m pip freeze
cachetools==4.1.0
google-auth==1.17.2
pyasn1==0.4.8
pyasn1-modules==0.2.8
rsa==4.6
six==1.15.0
(tmp) $ python
Python 3.6.9 (default, Jan 26 2020, 20:47:45) 
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from google.auth.transport import mtls
>>> 

[nitramsivart]

Note, this is still an issue when I install this package with conda install, because these dependency requirements haven’t been updated in the conda recipe: https://github.com/conda-forge/google-api-python-client-feedstock/issues/39