[Python] brew installation of Python 3.6.1: [SSL: CERTIFICATE_VERIFY_FAILED] certificate...

I installed python 3.6 using

brew install python3

and tried to download a file with six.moves.urllib.request.urlretrieve from an https, but it throws the error

ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)
​

In the Python installation (from .pkg), the README indicates that one needs to run the Install Certificates.command after the installation to

1. install certifi
2. symlink the certification path to certify path

to be able to use certificates.

However, in brew install, this file does not exist and it does not seem to be run.

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