Python – How to edit txt.file of one class in another

I’m working on my first serious project in python using objects. I’m still beginner (1month in python) and after couple of tutorials and hours of checking/testing code, I have finally created quite fine bank app. The problem is that I’m struggling with edditing the txt file of one class in another class. let me explain what I need. I’ve created app where you can register your account and then log onto it. When you are logged in, bank menu displays where you can deposit and withdraw money (I will apply more options soon). As a database I have used file=option(xxx, “w”) so each user exists as the indenpendent txt. Each txt file contains three lines: login, password, security code. My goal is to add there forth line which will be balance, so the amount of money after deposit/withdraw will be saved after application is closed. I’m stuck on it and cannot figure it out and I’m getting slowly flustrated so I’ve decided to ask you for help. This is the code:

    import tkinter as tk     import os     import random     from tkinter import messagebox     from tkinter import font as tkfont     from banking import bank      class menu(tk.Tk):              def __init__(self):                 tk.Tk.__init__(self)                 tk.Tk.configure(self, bg="red")                 tk.Tk.geometry(self, "300x250")                 tk.Tk.title(self, "Smiglo Bank")                 tk.Label(self, text = "Welcome to Smiglo Bank", bg="pink", font = ("Algerian", 13)).pack()                 tk.Label(self, text = "").pack()                 tk.Button(self, text="Login", width=20, command=self.login).pack()                 tk.Label(self, text = "").pack()                 tk.Button(self, text="Register", width=20, command=self.register).pack()          # register system              def register_user(self):                 c = str(random.randint(1000, 9000))                  self.username_info = username.get()                 self.password_info = password.get()                 self.code_info = c                  file=open(self.username_info, "w")                 file.write(self.username_info+"\n")                 file.write(self.password_info+"\n")                 file.write(self.code_info)                 file.close                  self.username_entry.delete(0, tk.END)                 self.password_entry.delete(0, tk.END)                  tk.Label(self.screen1, text="Registration succes", fg="green", font=("calibri", 11)).pack()                 messagebox.showinfo("Success", "your security code is: "+self.code_info)          # register window              def register(self):                 global screen1                  self.screen1 = tk.Toplevel(self)                 self.screen1.title("register")                 self.screen1.geometry("300x250")                  global username                 global password                 global username_entry                 global password_entry                  username = tk.StringVar()                 password = tk.StringVar()                  tk.Label(self.screen1, text ="Please enter details").pack()                 tk.Label(self.screen1, text ="").pack()                  tk.Label(self.screen1, text ="Username *").pack()                 self.username_entry = tk.Entry(self.screen1, textvariable=username)                 self.username_entry.pack()                  tk.Label(self.screen1, text ="Password *").pack()                 self.password_entry = tk.Entry(self.screen1, textvariable=password)                 self.password_entry.pack()                  tk.Label(self.screen1, text ="").pack()                 tk.Button(self.screen1, text="register", width=20, command=self.register_user).pack()           #login system              def login_verify(self):                  self.login_details = self.username2.get()                 self.password_details = self.password2.get()                 self.security_code_details = self.security_code.get()                 self.username_entry2.delete(0, tk.END)                 self.password_entry2.delete(0, tk.END)                 self.security_code_entry.delete(0, tk.END)                  list_of_files = os.listdir()                 if self.login_details in list_of_files:                         file1 = open(self.login_details, "r")                         verify =                          if self.password_details in verify and self.security_code_details in verify:                                 print("login succes")                                 bank(self.login_details, self.password_details, self.security_code_details)                          elif self.password_details is not verify or self.security_code_details is not verify:                                 messagebox.showinfo("password/code error", "Password or code is incorrect")                 else:                         messagebox.showinfo("user error", "User not found")          #login window              def login(self):                 global screen2                  self.screen2 = tk.Toplevel(self)                 self.screen2.title("login")                 self.screen2.geometry("300x250")                  global username2                 global password2                 global security_code                 global username_entry2                 global password_entry2                 global security_code_entry                  self.username2 = tk.StringVar()                 self.password2 = tk.StringVar()                 self.security_code = tk.StringVar()                  tk.Label(self.screen2, text ="Username *").pack()                 self.username_entry2 = tk.Entry(self.screen2, textvariable=self.username2)                 self.username_entry2.pack()                  tk.Label(self.screen2, text ="Password *").pack()                 self.password_entry2 = tk.Entry(self.screen2, textvariable=self.password2)                 self.password_entry2.pack()                  tk.Label(self.screen2, text ="Security Code *").pack()                 self.security_code_entry = tk.Entry(self.screen2, textvariable=self.security_code)                 self.security_code_entry.pack()                  tk.Label(self.screen2, text ="").pack()                 tk.Button(self.screen2, text="login", width=20, command=self.login_verify).pack()   class bank(tk.Tk):      def __init__(self, name, password, code, balance=0):         self.balance = balance = name         self.password = password         self.code = code          tk.Tk.__init__(self)         tk.Tk.title(self, "Smiglo bank")         tk.Tk.geometry(self,"400x500")          tk.Label(self, text="").pack()         tk.Label(self, text="").pack()         tk.Button(self, text="deposit", bg="red", command=self.deposit).pack()         self.depo_entry = tk.Entry(self, bg="yellow")         self.depo_entry.pack()         tk.Button(self, text="withdraw", bg="red", command=self.withdraw).pack()         self.withh_entry = tk.Entry(self, bg="yellow")         self.withh_entry.pack()         tk.Label(self, text="").pack()         tk.Label(self, text="").pack()         tk.Button(self, text="Check balance", bg="red", command=self.check).pack()       def check(self):         bal = ("%s" % self.balance)         messagebox.showinfo("Balance status", "Current Balance: "+bal)      def deposit(self):         self.amt = int(self.depo_entry.get())          if self.amt < 0:             self.balance = self.balance             print("You cannot deposit negative amount")          else:             self.balance = self.balance + self.amt             var = ("%s" % int(self.balance))             file2 = open(self.login_details, "w")             file2.write(self.balance)             messagebox.showinfo("balance","your balance: "+var)       def withdraw(self):         self.amt = int(self.withh_entry.get())          if self.amt > self.balance:             self.balance = self.balance             print('insufficient funds')          elif self.amt < 0:             self.balance = self.balance             print(, "You cannot withdraw negative amount")          else:             self.balance = self.balance - self.amt             print(, 'balance after withdraw', self.balance) 

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enter code here

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enter image description here

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