def Login():
    global usernameLogin
    global usernamePass
    global numberOfUsers
    usernameLogin = Entry.get(entry_1)
    usernamePass = Entry.get(entry_2)
    if len(users) != 0 and len(passwordForUsers) != 0:
        for i in range(numberOfUsers):
            if users[i] == usernameLogin:
                if passwordForUsers[i] == usernamePass:
                    login_complete = Tk()
                    loginComplete = Label(login_complete, text='Login Complete')
                    okButton = Button(login_complete, text='continue', command=mainMenu)
                    okButton.grid(row=1)
                    loginComplete.grid(row=0)



                else:
                    Login_Failed = Tk()
                    loginFailed = Label(Login_Failed, text='Login Failed')
                    loginFailed.pack()
                    Login_Failed.mainloop()


            else:
                Login_Failed = Tk()
                loginFailed = Label(Login_Failed, text='Login Failed')
                loginFailed.pack()
                Login_Failed.mainloop()
    else:
        Login_Failed = Tk()
        loginFailed = Label(Login_Failed, text='Login Failed')
        loginFailed.pack()
        Login_Failed.mainloop()



def mainMenu():
    Blank_Window.destroy()
    MainMenu = Tk()
    addNewUser=Button(MainMenu, text='Add a New User')
    editUser = Button(MainMenu, text='Edit an Existing User')
    removeUser = Button(MainMenu, text='Remove a User')
    ViewUsers = Button(MainMenu, text='View a List of Current Users')
    Delete()
    addNewUser.grid(row=0, sticky=W)
    editUser.grid(row=1, sticky=W)
    removeUser.grid(row=2, sticky=W)
    ViewUsers.grid(row=3, sticky=W)
    login_complete.destroy()