password

from tkinter import *
import tkinter.messagebox as box

main = Tk()
main.title('Login')
frame1 = Frame(main)
frame2 = Frame(main)
frame3 = Frame(main)

accounts = {}

def login():
    User = entry1.get()
    Pass = entry2.get()
    if User not in accounts:
        error('Login failed:\nUsername does not exist')
    elif accounts[User] == Pass:
        show('Success', 'Login successful')
    else:
        error('Login failed:\nIncorrect password')

def create():
    User = entry1.get()
    Pass = entry2.get()
    if User in accounts:
        error('Account creation failed:\nUsername in use')
    else:
        accounts[User] = Pass
        show('Create', 'Account creation succesful')

def error(Emessage):
    error = box.showerror('Error', Emessage)

def show(title, message):
    show = box.showinfo(title, message)

label1 = Label(frame1, text = 'Username:')
label2 = Label(frame2, text = ' Password:')

entry1 = Entry(frame1)
entry2 = Entry(frame2)

L_btn = Button(frame3, text = 'Login', command = login)
C_btn = Button(frame3, text = 'Create account', command = create)

frame1.pack()
frame2.pack()
frame3.pack()

label1.pack(side = LEFT, pady = 5)
label2.pack(side = LEFT, pady = 5)
entry1.pack(side = RIGHT)
entry2.pack(side = RIGHT)
L_btn.pack(side = LEFT, padx = 10)
C_btn.pack(side = RIGHT, padx = 10)

main.mainloop()