Could not fetch URL https://pypi.python.org/simple/pyecharts/

用virtual env后 pip安装一些个库可能会报这个

Could not fetch URL https://pypi.python.org/simple/*/: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:661) - skipping

原因在于pip版本过低了,我的python2.7 用env后就是8.0,可以用下面的方法更新再重试pip install

curl https://bootstrap.pypa.io/get-pip.py | python

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