login python

import tkinter
from tkinter import *
from window2 import menu
import db.db
from tkinter import messagebox, Button
from PIL import ImageTk, Image

#root=login page
root1=menu
#rootp=patient form

#variables
root=None
userbox=None
passbox=None
topframe=None
bottomframe=None
frame3=None
login=None


#command for login button
def GET():
    global userbox,passbox,error
    S1 = userbox.get()
    S2 = passbox.get()
    data = (
        S1,S2
    )
    if S1 == "":
        messagebox.showinfo("Alert!", "Enter USERNAME First")
    elif S2 == "":
        messagebox.showinfo("Alert!", "Enter Password first")
    else:
        res = db.db.user_login(data)
        if res:
            # messagebox.showinfo("Message", "Login Successfully")
            root.destroy()
            menu()

        else:
            messagebox.showinfo("Alert!", "Wrong username/password")


#LOGIN PAGE WINDOW
def Entry():
    global userbox,passbox,login,topframe,bottomframe,image_1,root
    root = tkinter.Tk()
    # root.geometry("1000x600")
    root.geometry("1920x1080")
    root.iconbitmap('/Users/guneshs/PycharmProjects/HMSnhce/images/hms.ico')
    basewidth = 1080
    baseheight = 1920

    img = Image.open("/Users/guneshs/PycharmProjects/HMSnhce/images/hospital.jpeg")

    # wpercent = (basewidth / float(img.size[0]))
    # hsize = int((float(img.size[1]) * float(wpercent)))
    # hsize = int(hsize * 1.65)
    # basewidth = img.size[1]
    baseheight = int(baseheight * 0.89)
    basewidth = int(basewidth * 0.9258)
    img = img.resize((baseheight, basewidth ), Image.ANTIALIAS)

    background_image = ImageTk.PhotoImage(img)

    l = Label(root, image=background_image)
    l.place(x=0, y=0)

    # topframe = tkinter.Frame(root)
    # topframe.pack()
    # bottomframe=tkinter.Frame(root)
    # bottomframe.pack()

    # l = Label(image=img)
    # l.pack()

    # heading = tkinter.Label(root, text="WELCOME TO Hospital Management System",font='Times 28 bold italic')

    # heading.place(relx=0.0, rely=1.0, anchor='sw')

    username=tkinter.Label(root, text="USERNAME", bg="green")
    username.place(x=100, y=50 )
    userbox = tkinter.Entry(root)
    userbox.place(x=100, y=80)

    password=tkinter.Label(root, text="PASSWORD")
    passbox = tkinter.Entry(root, show="*")

    login = tkinter.Button(root, text="LOGIN", bg="green", command=GET,font="arial 8 bold")

    # heading.pack()
    username.pack()
    userbox.pack()
    password.pack()
    passbox.pack()
    login.pack()
    # login.pack(side=tkinter.LEFT)
    root.title("HOSPITAL MANAGEMENT SYSTEM")


    root.mainloop()



Entry()