how to separate view and controller in python tkinter?

Question

I have a problem with tkinter regarding separating UI and UI functionality in two modules,here is my code:

1-view.py

from tkinter import *

class View():
    def __init__(self,parent):
        self.button=Button(parent,text='click me').pack()

2.controller.py

from tkinter import *
from view import *

class Controller:
    def __init__(self,parent):
        self.view1=View(parent)
        self.view1.button.config(command=self.callback)

    def callback(self):
        print('Hello World!')


root=Tk()
app=Controller(root)
root.mainloop()

on running controller.py I get the following error:

AttributeError: 'NoneType' object has no attribute 'config'

any suggestion?

also I tried to use lambda for using a callback function in another module but it didn't work.

thanks in advance

Mehdi · Accepted Answer · 2013-07-12 05:17:52Z

2

the lambda approach problem was exactly as above which is now resolved by using the pack in a new line. it seems more beautiful, here is the sample using lambda which is working fine:

1.view.py

from tkinter import *
from controller import *

class View():
    def __init__(self,parent):
        button=Button(parent,text='click me')
        button.config(command=lambda : callback(button))
        button.pack()


root=Tk()
app=View(root)
root.mainloop()

2.controller.py

def callback(button):
    button.config(text='you clicked me!')
    print('Hello World!')

using this approach we can move all functionality away from UI and make it clean and readable.

answered Jul 12, 2013 at 5:17

Mehdi

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Comments

Paulo Almeida · Accepted Answer · 2013-07-11 17:26:04Z

1

In view.py you are calling:

self.button=Button(parent,text='click me').pack()

The pack function doesn't return the Button object that you want to assign to self.button, which causes the AttributeError later on. You should do:

self.button = Button(parent, text='click me')
self.button.pack()

answered Jul 11, 2013 at 17:26

Paulo Almeida

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