title: python 3.6 certificate failure after installing certifi
body: <p>I'm getting SSL certificate failures in my python 3.6 scripts that are running on OS X. It is my understanding that installing the certifi module is supposed to get rid of these failures, but it hasn't. This is the output of the failing script:</p>
  
  <pre><code>Traceback (most recent call last):
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/urllib3/connectionpool.py", line 601, in urlopen
      chunked=chunked)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/urllib3/connectionpool.py", line 346, in _make_request
      self._validate_conn(conn)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/urllib3/connectionpool.py", line 850, in _validate_conn
      conn.connect()
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/urllib3/connection.py", line 326, in connect
      ssl_context=context)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/urllib3/util/ssl_.py", line 329, in ssl_wrap_socket
      return context.wrap_socket(sock, server_hostname=server_hostname)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 407, in wrap_socket
      _context=self, _session=session)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 814, in __init__
      self.do_handshake()
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 1068, in do_handshake
      self._sslobj.do_handshake()
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 689, in do_handshake
      self._sslobj.do_handshake()
  ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:833)
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/requests/adapters.py", line 440, in send
      timeout=timeout
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/urllib3/connectionpool.py", line 639, in urlopen
      _stacktrace=sys.exc_info()[2])
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/urllib3/util/retry.py", line 388, in increment
      raise MaxRetryError(_pool, url, error or ResponseError(cause))
  urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='34.203.232.192', port=2376): Max retries exceeded with url: /v1.35/containers/json?limit=-1&amp;all=1&amp;size=0&amp;trunc_cmd=0 (Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:833)'),))
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/Users/csimmons/Documents/repos/onedoclily2/server/dlserver/configure/GetDynamoInstance.py", line 137, in &lt;module&gt;
      sys.exit(main())
    File "/Users/csimmons/Documents/repos/onedoclily2/server/dlserver/configure/GetDynamoInstance.py", line 95, in main
      containers = get_containers(client, container_name)
    File "/Users/csimmons/Documents/repos/onedoclily2/server/dlserver/configure/GetDynamoInstance.py", line 30, in get_containers
      all_containers = client.containers.list(all=True)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/docker/models/containers.py", line 895, in list
      since=since)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/docker/api/container.py", line 204, in containers
      res = self._result(self._get(u, params=params), True)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/docker/utils/decorators.py", line 46, in inner
      return f(self, *args, **kwargs)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/docker/api/client.py", line 194, in _get
      return self.get(url, **self._set_request_timeout(kwargs))
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/requests/sessions.py", line 521, in get
      return self.request('GET', url, **kwargs)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/requests/sessions.py", line 508, in request
      resp = self.send(prep, **send_kwargs)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/requests/sessions.py", line 618, in send
      r = adapter.send(request, **kwargs)
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/requests/adapters.py", line 506, in send
      raise SSLError(e, request=request)
  requests.exceptions.SSLError: HTTPSConnectionPool(host='34.203.232.192', port=2376): Max retries exceeded with url: /v1.35/containers/json?limit=-1&amp;all=1&amp;size=0&amp;trunc_cmd=0 (Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:833)'),))
  </code></pre>
  
  <p>This, I believe, shows that certifi is installed:</p>
  
  <pre><code>$ /Library/Frameworks/Python.framework/Versions/3.6/bin/python3 -m pip install certifi
  Requirement already satisfied: certifi in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages
  </code></pre>