u'''bool readline_callback_handler_install ( string prompt, callback callback)
        Initializes the readline callback interface and terminal, prints the prompt and returns immediately

def callback_handler_install(self, prompt, callback):
        u'''bool readline_callback_handler_install ( string prompt, callback callback)
        Initializes the readline callback interface and terminal, prints the prompt and returns immediately
        '''
        self.callback = callback
        self.readline_setup(prompt)