相关疑难解决方法(0)

我正在尝试使用安装Python库pip,收到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

点数版本:pip 9.0.1

我该如何解决这个错误？