Connecting modules and packages

Question

I am trying to implement a GUI with python3x and Tkinter in separate scripts.

I have a gui_test folder organized as follows:

• Gui (sub-folder): Unit.py and app.py (Tkinter)
• utils (sub-folder): Unit.py and functions.py
• Unit.py (file)
• main.py (file)

Here’s what I wanna do:

1) the main.py calls the app.py

2) in the app.py has buttons and call functions in functions.py

3) I want functions.py to print the function output in the app.py GUI, but I’m not getting that connection.

The scripts are like this:

main.py:

from gui import app

if __name__ == '__main__':
    app.main()

app py.:

from tkinter import *
from utils import functions

class Application():
    def __init__(self, master=None):
        self.msg = Label(master, text= 'Primeira Mensagem')
        self.msg.pack()

        self.btnTrocaMsg = Button(master, text= 'Trocar', command= functions.trocaMsg)
        self.btnTrocaMsg.pack()

def main():
    root = Tk()
    Application(root)
    root.mainloop()

functions:

from gui import app

def trocaMsg():
    <caminho?>.msg['text'] = 'Mensagem trocada.'

Which way?

Files are properly grouped in folders?

I changed the app.py and functions.py:

app py.:

(...)
    self.btnTrocaMsg = Button(master, text= 'Trocar', command= ***self.troca***)
    self.btnTrocaMsg.pack()


***def troca(self):
    a = functions.trocaMsg(self)
    self.msg['text'] = a***
(...)

No functions.py:

from gui import app


    ***def trocaMsg(msg):
        return 'Mensagem trocada.'***

The application worked. However, I ask: the code is the right way?