pip search能搜到，就是安装不了
$ pip install PyQt5
Collecting PyQt5
Could not find a version that satisfies the requirement PyQt5 (from versions: )
No matching distribution found for PyQt5
$ pip install PyQt4
Collecting PyQt4
Could not find a version that satisfies the requirement PyQt4 (from versions: )
No matching distribution found for PyQt4

我也遇到同样问题。