安装步骤参考 http://blog.csdn.net/tao_627/article/details/46499545
最后一步：
运行python helloworld.py出错：
Traceback (most recent call last):
File "helloworld.py", line 5, in <module>
from PyQt5 import QtCore, QtGui, QtWidgets
RuntimeError: the sip module implements API v11.0 to v11.1 but the PyQt5.QtCore module requires API v11.3
在命令行输入：
$ python
>>>import sip
>>>print(sip, sip.SIP_VERSION_STR)
(<module 'sip' from '/usr/lib/python2.7/dist-packages/sip.x86_64-linux-gnu.so'>, '4.16.6')
解决办法：
删除/usr/lib/python2.7/dist-packages/sip.x86_64-linux-gnu.so