在用pip7.1.2版本安裝第三方模塊時出現了如下警告：
/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 appropriatelyand may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.提示是由於urllib3的SSL連接失敗
解決方法
首先安裝Python-devel libffi-devel openssl-devel
yum install python-devel libffi-devel openssl-devel
之后在安裝pyopenssl ndg-httpsclient pyasn1
pip install pyopenssl ndg-httpsclient pyasn1
上面的包與模塊安裝后，就不會出現上面的告警了。