Programme modulaire

import tkinter
import datetime
import login
#la fenetre d'authentification
def gologin():
    master.destroy()
    login.login()

#la fenetre d'inscription avec le boutton qui appele la fenetre login
master=tkinter.Tk()
master.title("systeme d'inscription")
master.geometry("1350x750+0+0")
master.config(bg='navy')
lbTitle = tkinter.Label(text="inscription a l'ERP de kanvoo" ,font=('arial', 30, 'bold'), bg='aqua' ,fg='Cornsilk')
lbTitle.grid(row=0, column=1, columnspan=2, pady=0)
sv = tkinter.StringVar() # Variable de type chaîne
legende = tkinter.Label(master, textvariable = sv)
legende.grid(row=0, column=0)
now = datetime.datetime.now()
a=now.strftime("%H:%M:%S %d/%m/%Y ")
sv.set(a)
bouton3 = tkinter.Button (master, text = "se connecter" , font=('arial',30,'bold'),command=gologin, bd=22,
bg='light green', fg='Cornsilk')
bouton3.grid(row=6, column=2)

import tkinter

#la fenetre d'authentification
def login():
    
    ##
    login=tkinter.Tk()
    login.title("systeme d'authentification")
    login.geometry("1350x750+0+0")
    login.config(bg='aqua')