Python 安装第三方模块，或者请求 HTTPS 链接时提示：
/usr/lib/python2.7/site-packages/pip-7.1.2-py2.7.egg/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90:
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.
需要安装：
pip install pyopenssl ndg-httpsclient pyasn1
如果安装 'pyopenssl' 不成功，则还需要安装其他的依赖：
sudo apt-get install libffi-dev libssl-dev
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