获取 Python 属性的 setter 函数

Question

I'm using a GUI module with an onchange parameter.

Currently I have a Settings object that contains properties, and I want to bind them to my GUI.

But my GUI only accepts setter functions , and not variables , so I need to get the setter function of my property.

Here is the Settings code:

class Settings:
    def __init__(self):
        self._name = "Jhon Doe"

    @property
    def name(self):
        return self._name

    @name.setter
    def name(self, value):
        if value.count(" ") > 1:
            self._name = value

Here is the (simplified) GUI code:

import pygame
import pygame_menu
from settings import Settings

settings = Settings()

pygame.init()
surface = pygame.display.set_mode((600, 600))

menu = pygame_menu.Menu('My menu', 600, 600)

menu.add.text_input('Name :', default='John Doe', onchange=settings.name)
menu.add.button('Quit', pygame_menu.events.EXIT)
menu.mainloop(surface)

Answer 1

You don't need the actual function, that is written as a method so it requires the instance. Just do what you'd do in this situation, whether there were a property or not:

def _callback(value):
    settings.name = value

menu.add.text_input('Name :', default='John Doe', onchange=_callback)

Or, alternatively,

menu.add.text_input('Name :', default='John Doe', onchange=lambda value: setattr(settings, "name", value))