def loginValid():
    UsernameValidity=UserName_Entry.get()
    PasswordValidity=Password_Entry.get()
    cursor.execute('SELECT 1 FROM users WHERE username = ? AND password = ?',[UsernameValidity, PasswordValidity])
    LogInAttempt = cursor.fetchone()
    print (loginValid) # Testing to see if it works on shell
    if LogInAttempt:
        validUser = True
        root.config(menu=mainMenu) # changes the menu
        print (" One of the accounts have successfully logged in ")
        messagebox.showinfo("Successful Login", "You have successfully accessed our system")
        toFrame(welcome) # changes its frame
    else:
        print (" One of the accounts inputted the wrong credentials! ")
        messagebox.showinfo("Unsuccessful Login")