如何让导入的模块访问 tkinter 小部件和变量？

Question

I had this Cafe Management System whom I've separated the gui and functions into modules.

Here are some snippets:

main.py

from tkinter import *

import checkbox_operation
import receipt_operation


class cafemanagementsystem:

def __init__(self, cms):
    self.cms = cms
    cms.title("Cafe Management System")
    
    self.b1var = IntVar(value=1)
    self.b1v = StringVar()
    self.b1v.set("0")

    self.b1 = Checkbutton(self.bevmenu, command=self.check, text="Latte", variable=self.b1var, onvalue=1, offvalue=0).grid()
    self.b1a = Entry(self.bevmenu, bd=2, textvariable=self.b1v)
    self.b1a.grid()

    self.rcpt = Text(self.rcptmain, width=50, height=30, bd=4)
    self.rcpt.grid()

    self.btnrcpt = Button(self.rcptbtn, command=receipt_operation.receipt, text="Receipt").grid()

    self.btnrst = Button(self.rcptbtn, command=receipt_operation.reset, text="Reset").grid()

def check(self):
    checkbox_operation.check(self)

def receipt(self):
    receipt_operation.receipt(self)

checkbox_operation.py

def check(cafemanagementsytem_inst):
    if b1var.get() == 1:
        b1a.config(state=NORMAL)
    elif b1var.get() == 0:
        b1a.config(state=DISABLED)
        b1v.set("0")

receipt_operation.py

def receipt():
    rcpt.insert(END, "Offical Receipt\n")
    rcpt.insert(END, "Latte \t\t\t\t" + b1v.get() + "\n")

My problem is that I can't get check() and receipt() to work. Also, def check(self) and def receipt(self) gives the following error:

TypeError: check()/receipt() takes 0 positional arguments but 1 was given

Are there any solutions for this? Also, please tell me if the way I wrote the code contributed to the problem as I've been stuck in this problem for almost a week.

Answer 1

You need to pass the proper variables into those other functions. I'm wondering why you have checkbox_operation in a separate file, when it should be part of the class. It's not good practice that those external functions need to have such detailed knowledge of the internal workings of the class.

    ...
    def check(self):
        checkbox_operation.check(self)

    def receipt(self):
        receipt_operation.receipt(self)

def check(cafe):
    if cafe.b1var.get() == 1:
        cafe.b1a.config(state=NORMAL)
    elif cafe.b1var.get() == 0:
        cafe.b1a.config(state=DISABLED)
        cafe.b1v.set("0")

def receipt(cafe):
    cafe.rcpt.insert(END, "Offical Receipt\n")
    cafe.rcpt.insert(END, "Latte \t\t\t\t" + cafe.b1v.get() + "\n")