无法安装Python包[SSL：TLSV 1_告警_协议版本]

Question

无法安装Python包[SSL：TLSV 1_告警_协议版本]

我正在尝试使用以下方法安装Python库pip，获取SSL错误：

~/projects/base  pre-master±  pip install xdict

Collecting xdict

  Could not fetch URL https://pypi.python.org/simple/xdict/: There was a problem confirming the ssl certificate: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) - skipping

  Could not find a version that satisfies the requirement xdict (from versions: )

No matching distribution found for xdict

PIP版本：PIP 9.0.1

如何修复此错误？