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使用pip按照virtualenv报错，如下：
pip install virtualenv Collecting virtualenv /opt/python27/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:315: SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#snimissingwarning. SNIMissingWarning Could not fetch URL https://pypi.python.org/simple/virtualenv/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:590) - skipping Could not find a version that satisfies the requirement virtualenv (from versions: )
使用–trusted-host命令行选项
pip --trusted-host pypi.python.org install virtualenv
安装其他库的时候只要出现类似错误 均可以使用此方法
Python virtualenv安装库报错SSL: CERTIFICATE_VERIFY_FAILED
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原文地址：http://www.cnblogs.com/lfoder/p/5878051.html
