My Python GUI app, works perfectly but when I try to create an executable I tried with pyinstaller (3.3.dev0+483c819) command:
pyinstaller gui_app.py
Apparently the import of those modules is done in the subfolder kwargs, but those files actually need to be placed in the root folder.
So I just copied those files from
Lib\site-packages\wx-3.0-msw\wx\lib\pubsub\core\kwargs
to
Lib\site-packages\wx-3.0-msw\wx\lib\pubsub\core
and now IT WORKS!