Pubsub-driven MVC application with wxPython

I'm still learning Python, so I tried to build a basic MVC app using wxPython and pubsub. While it seems to work fine, the code seems to be getting out of hand.

In model I decided against using traditional (e.g. Java) accessors and went with the more Pythonic approach of properties. I only wanted to set the setters, but ended up needing to set the getters too (because the variable name had to change to prevent recursion). What's the preferred way to do this?

Next, the flow for setting each variable seems a mess. Right now, changing the name in view publishes a message which controller is subscribed to, so it sets the name in model, which publisher another message which controller is subscribed to, which sends a message to view, which finally does something with the values (the last part is not really required at the moment, but should be in many cases). Is this all peachy, or am I missing something?

As for any other blunders, I'd be happy to hear them!

I mostly followed Mike Rooney's Code Sample.

```
"""
A simple attempt at a pubsub-driven MVC application with wxPython
"""
import wx
import wx.lib.pubsub

# this seems to be required -- bug?
pub = wx.lib.pubsub.Publisher()

class Model(object):
def __init__(self, name, age):
self._name = name
self._age = age

@property
def name(self):
return self._name

@name.setter
def name(self, value):
self._name = value
pub.sendMessage("name.changed", self.name)

@property
def age(self):
return self._age

@age.setter
def age(self, value):
self._age = value
pub.sendMessage("age.changed", self.age)

class View(wx.Frame):
def __init__(self, parent):
wx.Frame.__init__(self, parent, title="MVC test", size=(200, 150))

# setup sizers
self.padding_sizer = wx.BoxSizer(wx.HORIZONTAL)
self.sizer = wx.FlexGridSizer(2, 2, 8, 25)
self.sizer.AddGrowableCol(1, 1) # make the second column fit availab

It mostly looks pretty good. I have just a couple tweaks to suggest.

You have

import wx.lib.pubsub

# this seems to be required -- bug?
pub = wx.lib.pubsub.Publisher()

The example from the wxpython wiki does

from wx.lib.pubsub import Publisher as pub

I think using that form of the import will let you drop the line where you instantiate the Publisher.

I like to put my mainline code in a main() routine right after the imports so it's clear where the work begins

def main(args):
    #create the wx app
    app = wx.App(False)

    # pass the app to the controller
    controller = Controller(app)

    # start the app running
    app.MainLoop()

Then at the bottom of the file,

if __name__ == '__main__':
    # call main rather than hiding the payload down here
    main(sys.argv)

StackExchange Code Review Q#17939, answer score: 4