参考：

http://blog.****.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.****.net/sbisyju/article/details/8697081

http://bbs.****.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：