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re: cert_paths = [...]
This approach is rather problematic, there's no guarantee that a path trusted on one system is trusted on another.
I saw this in setuptools branch, where it does:
for path in cert_path:
 if os.path.exists(path)
 return path
Let's say you're user1 on osx and your native true path is "/System/Library/OpenSSL/certs/cert.pem", can you guarantee that someone else, user2, cannot sneak their hacked files into "/etc/pki/" (presumably missing altogether) or "/usr/local/share/"?
Because if user2 can do that, suddenly user1 verifies all traffic against hacked ca list.