[Tutor] method could be a function warning

[Phil]

I've been in the habit of mixing methods and functions within the GUI 
class and to get the functions to work I've had to prefix the call to 
the function with .self and add self as a function argument. The 
function dummy in the following code is an an example of this.

It makes more sense to me, and I think it's correct, to define and call 
the functions outside the GUI class as I've done with my_function below. 
Also, I'm thinking that the GUI class should be in a file of it's own 
because the total number of lines of code exceeds 500 thus making 
scrolling tedious.

I ask because I'm in the process of tidying up a Conway's Game of Life 
project that I wrote 3 years ago.

import tkinter as tk

class Root(tk.Tk):
     def __init__(self):
         super().__init__()

         self.title('test')
         self.geometry('300x300')

         self.frame = tk.Frame()

         self.dummy()

     def dummy(self):
         print('hello')

def my_function():
     print('my function')

my_function()

if __name__ == '__main__':
     root = Root()
     root.mainloop()

-- 

Regards,
Phil