Unable to pip install package on Mac after first deployment

[purplediane]

Location within the Course

• Section: 3
• Lesson: 7
• Language: English

Description

After deploying successfully to PyPI, I was unable to pip install it into a new test-env. Here is the error:

Download error on https://pypi.python.org/simple/pytest-runner/:
[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:748) -- Some packages may not be found!
Couldn't find index page for 'pytest-runner' (maybe misspelled?)
Download error on https://pypi.python.org/simple/: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:748) -- Some packages may not be found!
No local packages or working download links found for pytest-runner

Things I tried that didn't work

Based upon https://stackoverflow.com/questions/25981703/pip-install-fails-with-connection-error-ssl-certificate-verify-failed-certi/46410817#46410817
I added $HOME/Library/Application Support/pip/pip.conf file with:

[global]
trusted-host = pypi.python.org

That did not work. So I went to: pypa/pip#4205
I tried pip install --trusted-host pypi.python.org pip --upgrade; that did not help. Also did pip install incremental that made no apparent difference.

What worked

The previous pypa issue above referenced this issue: heroku/heroku-django-template#79
where I found the instruction to run /Applications/Python\ 3.6/Install\ Certificates.command, after which things were OK.

Maybe this can be put into an FAQ if others have this problem. Should include links to the issues since a number of people indicated that other things fixed the similar error on their machines.