python引用问题：from wx.lib.pubsub import Publisher

在模块开始加入
from wx.lib.pubsub import Publisher

报错：
Traceback (most recent call last):
File "G:\learning\python\python_workspace\test_QQ\src\test\test2.py", line 15, in
from wx.lib.pubsub import Publisher
ImportError: cannot import name Publisher

网上搜了好久，信息好少！
不知道怎么办，求大神指导！

from wx.lib.pubsub import pub as Publisher