There was a problem confirming the ssl certificate ……

在安装一个Python库onetimepass时发生下面的问题：

pip install onetimepass

Could not fetch URL https://pypi.python.org/simple/six/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:600) - skipping
Could not find a version that satisfies the requirement six (from onetimepass) (from versions: )
No matching distribution found six (from onetimepass)

经过网上查阅资料，发现是python版本的问题，高版本的Python会默认SSL。

解决方法：

pip install --trusted-host pypi.python.org onetimepass

参考文献
http://stackoverflow.com/questions/16370583/pip-issue-installing-almost-any-library

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