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NeverBelieveMe
V2EX  ›  Python

类方法要不要设定为静态方法问题

  •  
  •   NeverBelieveMe · Apr 15, 2019 · 2167 views
    This topic created in 2649 days ago, the information mentioned may be changed or developed.
    负责业务处理的 Service 类的方法,比如生成订单 create_order()方法,定义的时候要不要定义成 @staticmethod 静态方法?不设置静态方法,通过 Service().create_order(·······)的方式也可以调用。这样有什么问题么?
    2 replies    2019-04-17 17:15:45 +08:00
    qiyuey
        1
    qiyuey  
       Apr 15, 2019 via Android
    Java 里都是 IOC 的单例 Bean,一般不定义为 Static 的,Python 也应该是类似的吧
    xxx777
        2
    xxx777  
       Apr 17, 2019
    ```
    class BaseService:
    model: Model = None
    _service = dict()

    @classmethod
    def instance(cls):
    """Method instance
    :return: cls
    """
    instance = cls._service.get(cls.__name__, None)
    if not instance:
    instance = cls.__new__(cls)
    cls._service.setdefault(cls.__name__, instance)
    return instance
    ```
    可以在基础类写一个 instance 方法,调用的时候 UserService.instance().find_user_by_id() 这样调用是单例
    Service().create_order(·······) 这种每次都会创建新对象的
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