Could not find a version that satisfies the requirement xlrd (from versions: )
No matching distribution found for xlrd

解決方案：

$ curl https://bootstrap.pypa.io/get-pip.py >> get-pip.py

$ python get-pip.py

然後重新pip install 模塊名

來源 https://www.cnblogs.com/xiyuan2016/p/9013721.html#undefined

There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:661) - skipping