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

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When you run the python installer, they display this information to you. It is also documented in /Applications/Python 3.6/ReadMe.rtf, but it’s very easily overlooked.

Just browse to Applications/Python 3.6 and double-click Install Certificates.command

There is an issue in the Python bug tracker about this.
http://bugs.python.org/issue29480

Update: This issue is marked as resolved in the bug tracker with this text being part of the latest comment:

… For 3.7.0b2, I have tried to make things more obvious in two ways. One, the installer package will now attempt to open a Finder window for the /Application/Python 3.7 folder that contains the “Install Certificates.command”. Two, rather than just a generic “installation complete” message at the end of the install, there is now a tailored message that urges the user to click on the “Install Certificates.command” icon. …

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