Python GUI Programming with Tkinter

Using the login window

To use the dialog, our application needs a method that will display the dialog in an infinite loop until either the user clicks Cancel or the provided credentials successfully authenticate.

Start a new database_login() method in Application:

        def database_login(self):
            error = ''
            db_host = self.settings['db_host'].get()
            db_name = self.settings['db_name'].get()            title = "Login to {} at {}".format(db_name, db_host)

We begin by setting up an empty error string and a title string to pass to our LoginDialog class.

Now we'll start the infinite loop:

        while True:
            login = v.LoginDialog(self, title, error)
            if not login.result:
                break

Inside the loop, we create a LoginDialog, which will block until the user clicks one button or ...