Christian Heimes added the comment:

http://www.python.org/dev/peps/pep-0453/#bundling-ca-certificates-with-cpython 
proposes that ensurepip comes with a default CA cert bundle, too. I see two 
issues with the proposal:

1) We must have a way to update the cert bundle outside the release cycle, e.g. 
with a download-able package from PyPI

2) CA certs can have an implicit purpose that is not part of the X.509 cert. A 
cert may only apply to server certs, client certs, S/MIME and/or other purposes 
like software signing. I have found a couple of issues in NSS certdata parsers 
and cert bundles like curl, Egenix OpenSSL (both fixed) and Ubuntu (not fixed 
yet). In order to get it right we need a separate bundle for every purpose. See 
https://bugs.launchpad.net/ubuntu/+source/ca-certificates/+bug/1207004

A while ago I started a PEP about the topic but it's not done yet. 
https://bitbucket.org/tiran/peps/src/tip/pep-9999.txt

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