Quavo Bank Account

import tkinter
import time
import datetime
import random
from random import randint

#Functions needed for the program
def login():
    Bank_DB_UI = tkinter.Tk()
    Bank_DB_UI.title("Zoyds Bank")
    Bank_DB_UI.geometry("600x600")
    Bank_DB_UI.wm_iconbitmap('favicon.ico')
    Bank_DB_UI.configure(background="#5a5a5a")
    time.sleep(3)
    username = entUsername.get()
    password = entPassword.get()

    #Subheading Labels
    lbluser_name = tkinter.Label(Bank_DB_UI, text=username, bg="white", width="600", anchor="nw")
    lblpass_word = tkinter.Label(Bank_DB_UI, text=password, bg="white", width="600", anchor="nw")
    DB_Name = tkinter.Label(Bank_DB_UI, text="ZFD Enterprise", bg="white", width="600", font=("Helvetica", 42), anchor="nw")
    labelheader1 = tkinter.Label(Bank_DB_UI, text="Username:", bg="white", width="600", anchor="nw")
    labelheader2 = tkinter.Label(Bank_DB_UI, text="Password:", bg="white", width="600", anchor="nw")

    #Empty labels to make empty space
    lble1 = tkinter.Label(Bank_DB_UI, text="", bg="#5a5a5a")
    lble2 = tkinter.Label(Bank_DB_UI, text="", bg="#5a5a5a")
    lble3 = tkinter.Label(Bank_DB_UI, text="", bg="#5a5a5a")
    lble4 = tkinter.Label(Bank_DB_UI, text="", bg="#5a5a5a")
    lble5 = tkinter.Label(Bank_DB_UI, text="", bg="#5a5a5a")

    #Packing Labels
    lble3.pack()
    DB_Name.pack()
    lble2.pack()
    labelheader1.pack()
    lbluser_name.pack()
    lble1.pack()
    labelheader2.pack()
    lblpass_word.pack()

    #Stage 2 >>> Adding Balance Label to the UI
    rng=randint(0,1000000)
    balance=+rng

    balance_Label2 = tkinter.Label(Bank_DB_UI, text=balance, bg="white", width="600", anchor="nw")
    balance_Label = tkinter.Label(Bank_DB_UI, text="Balance(£):", bg="white", width="600", anchor="nw")

    lble4.pack()

    balance_Label.pack()
    balance_Label2.pack()

    #Stage 3 >>> Assign a random 4 digit pin to this account.
    from functools import reduce
    pin = reduce(lambda a,b: 10*a+b, random.sample(range(10), 4))

    PIN_Label = tkinter.Label(Bank_DB_UI, text=pin, bg="white", width="600", anchor="nw")
    PIN_Label2 = tkinter.Label(Bank_DB_UI, text="Bank Pin:", bg="white", width="600", anchor="nw")

    lble5.pack()

    PIN_Label2.pack()
    PIN_Label.pack()

#Loginpopup Funciton
def loginpopup():
    popup = tkinter.Tk()
    popup.wm_title("!")
    label = tkinter.Label(popup, text="Successfully Logged In!")
    label.pack(side="top", fill="x", pady=10)
    B1 = tkinter.Button(popup, text="Enter", command = login)
    B1.pack()
    popup.mainloop()


#Window Configuration
window = tkinter.Tk()
window.title("Zoyds Bank")
window.geometry("600x600")
window.wm_iconbitmap('favicon.ico')
window.configure(background="#5a5a5a")

#Please Login to Continue:
lblInst = tkinter.Label(window, text="Please login to continue:", bg="#a1dbcd", font=("Helvetica", 16))

#Widgets
lblUsername = tkinter.Label(window, text="Username:", bg="white")
entUsername = tkinter.Entry(window)

lblPassword = tkinter.Label(window, text="Password:", bg="white")
entPassword = tkinter.Entry(window)

btn = tkinter.Button(window, text="Login", command=loginpopup)

photo = tkinter.PhotoImage(file="quavo.gif")
w = tkinter.Label(window, image=photo) #quavo picture

#Space making widget
lblempty = tkinter.Label(window, text="", bg="#5a5a5a")
lble2 = tkinter.Label(window, text="", bg="#5a5a5a")
lble3 = tkinter.Label(window, text="", bg="#5a5a5a")
lble4 = tkinter.Label(window, text="", bg="#5a5a5a")



#Packing Widgets into Window
lblInst.pack()

lblempty.pack()

lblUsername.pack()
entUsername.pack()

lble2.pack()

lblPassword.pack()
entPassword.pack()

lble3.pack()

btn.pack()
w.pack()






window.mainloop()