参考：
http://blog.csdn.net/lingchen214/article/details/17960789
http://blog.sina.com.cn/s/blog_a6fb6cc90101ed6n.html
http://blog.sina.com.cn/s/blog_a6fb6cc90101en3a.html
http://blog.csdn.net/sbisyju/article/details/8697081
http://bbs.csdn.net/topics/390290700
http://blog.sina.com.cn/s/blog_56e295440100qklh.html
# 是否可以编辑
QComboBox.setEditable(True)
# 在输入的时候给予提示
wordList =["alpha" , "omega" , "omicron" , "zeta"]
completer =QCompleter (wordList)
combox.setCompleter (completer)
效果图：
