SSL Certificate Verification on OSX (Py 3.6)

[BenMartinAu]

Python 3.6 no longer uses OS X's bundled version of OpenSSL, which causes all web requests to fail.

Traceback (most recent call last):
  File "_/MyPyTutor/code/tutorlib/online/session.py", line 171, in _open
    return self._opener.open(url, data)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 532, in open
    response = meth(req, response)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 564, in error
    result = self._call_chain(*args)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 756, in http_error_302
    return self.parent.open(new, timeout=req.timeout)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 526, in open
    response = self._open(req, data)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 544, in _open
    '_open', req)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 1361, in https_open
    context=self._context, check_hostname=self._check_hostname)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 1320, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)>

See:

• https://www.python.org/downloads/release/python-360/#notes-on-this-release
• http://stackoverflow.com/a/42334357

[BenMartinAu]

@BraeWebb There is overlap between this and the keyring/keychain error (#181).

@applebyter We'll have to be sure to thoroughly check release notes before upgrading in future.

[BenMartinAu]

As per release notes & /Applications/Python 3.6/ReadMe.rtf, running the following command resolves the issue.

/Applications/Python\ 3.6/Install\ Certificates.command

Long term, we need to bundle this with MPT's install. For now, we should instruct students to open a terminal and run the command.

[BenMartinAu]

@applebyter @BraeWebb We'll leave the issue open until the fix is bundled with MPT.