参考：

Problem Confirming the SSL Certificate - OSX

OS X EI Captain 下解决 There was a problem confirming the ssl certificate 问题

在安装 matplotlib 时，出现以下错误：

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python3 -mpip install matplotlib

Collecting matplotlib
  Could not fetch URL https://pypi.python.org/simple/matplotlib/: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:645) - skipping
  Could not find a version that satisfies the requirement matplotlib (from versions: )
No matching distribution found for matplotlib

解决方法是使用以下方法更新pip：

curl https://bootstrap.pypa.io/get-pip.py | python3

2019.4

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