Undo “Install Certificates.command”

Question or issue on macOS: In Python 3.6+ on Mac, various SSL-related operations will fail (typically with a cryptic SSL: CERTIFICATE_VERIFY_FAILED error) until you run /Applications/Python\ 3.6/Install\ Certificates.command to install root certificates. After encountering such an error, I Googled, eventually discovered this solution (which is noted at, e.g. https://bugs.python.org/issue29065#msg283984), did it, and it worked.

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