警告：

/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/util/ssl_.py:79: 

          InsecurePlatformWarning: A true SSLContext object is not available.            This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail.            For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.   InsecurePlatformWarning

执行：

pip install pyopenssl ndg-httpsclient pyasn1