Basic python login system

[deanhystad]

You have no way to register users. Since you don't register new users I have no idea how user names and passwords are saved. Since I don't know how user names and passwords are saved I have no idea how to parse the password file.

I took your example and added code to register a new user. The resulting password file contains strings which are the username followed by a space followed by the password. Since the password file is saved in this format I use the same format for comparing the login request.

from tkinter import *
from functools import partial
 
 
def login(user, pwd):
    entry = f'{user.get()} {pwd.get()}\n'
    user.set("Username")
    pwd.set("Password")
    try:
        with open("User.txt", "r") as file:
            users = file.readlines()
    except FileNotFoundError:
        users = []

    for x in users:
        if entry == x:
            SuccessLabel.configure(text="Success")
            break
    else:
            SuccessLabel.configure(text="Wrong")
 

def register(user, pwd):
    entry = f'{user.get()} {pwd.get()}\n'
    user.set("Username")
    pwd.set("Password")
    try:
        with open("User.txt", "r") as file:
            users = file.readlines()
    except FileNotFoundError:
        users = []

    if entry not in users:
        users.append(entry)
        with open("User.txt", "w+") as file:
            file.writelines(users)

root = Tk()
root.geometry("400x300")
titlelabel = Label(root, text="Please Enter User and Password")
SuccessLabel = Label(root)

user_var = StringVar()
USER = Entry(root, textvariable = user_var)
user_var.set('Username')

pass_var  = StringVar()
PASS = Entry(root, textvariable = pass_var)
pass_var.set('Password')
 
LogButton = Button(root, text="Login", command=partial(login, user_var, pass_var))
RegButton = Button(root, text="Register new user", command=partial(register, user_var, pass_var))
 
titlelabel.pack()
SuccessLabel.pack()
USER.pack()
PASS.pack()
LogButton.place(x=150, y=100, height=50, width=100)
RegButton.place(x=150, y=150, height=50, width=100)
root.title("Login")
root.mainloop()