There was a problem confirming the ssl certificate ……
在安裝一個Python庫onetimepass時發生下面的問題：
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)
經過網上查閱資料，發現是python版本的問題，高版本的Python會預設SSL。
解決方法：
pip install --trusted-host pypi.python.org onetimepass
參考文獻
http://stackoverflow.com/questions/16370583/pip-issue-installing-almost-any-library
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