[Django]-Authentication failed: [Errno 1] _ssl.c:510: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

pip2.7 install --upgrade httplib2 

The above solution worked for me

I faced the same issue. Try doing pip install urllib3[secure], urllib3 doesn’t have certs by default so you have to do this. This is also shown here –> https://urllib3.readthedocs.org/en/latest/security.html#security

you can install the following package

python -m pip install  pyopenssl pyasn1 ndg-httpsclient

I got the same issue resolved by installing the above library.