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在用pip7.1.2版本安装第三方模块时出现了如下警告：
...
_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
...提示是由于urllib3的SSL连接失败
解决方法：
1, 安装python-devel libffi-devel openssl-devel
# yum install python-devel libffi-devel openssl-devel2, 安装pyopenssl ndg-httpsclient pyasn1
# pip install pyopenssl ndg-httpsclient pyasn1End !