python - SSL: CERTIFICATE_VERIFY_FAILED error with python3 on macOS 10.15

Question

/usr/bin/python3 from Xcode/CLT on macOS 10.15 (DB6/PB5 at the moment, with Xcode 11 beta 6) fails with SSL: CERTIFICATE_VERIFY_FAILED for all HTTPS requests originating from PSL, e.g. from urllib.request:

$ /usr/bin/python3 -c 'import urllib.request; urllib.request.urlopen("https://www.apple.com/")'
...
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1056)>

How to solve this problem?

(I know the answer, will post shortly; just sharing it in case other people run into it.)

Answer 1

Supplemental to @4ae1e1's answer, you can create a symlink to the SSL folder instead of rsyncing it. This will give the added benefit of keeping any changes in /etc/ssl up-to-date at /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.7/etc/ssl/.

/usr/bin/sudo /bin/mkdir /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.7/etc
/usr/bin/sudo /bin/ln -s /etc/ssl/ /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.7/etc/

Should do it.