Python virtualenv安裝庫報錯SSL: CERTIFICATE_VERIFY_FAILED

問題描寫敘述

使用pip依照virtualenv報錯，例如以下：

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: )

解決的方法

使用–trusted-host命令行選項

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

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Python virtualenv安裝庫報錯SSL: CERTIFICATE_VERIFY_FAILED