想法
+1
Question regarding the example for Decorator in Python's class-static variable (_component)
Hey there great folk,
Consider the following example for the Decorator pattern in Python: https://refactoring.guru/design-patterns/decorator/python/example
The section that defines the decorator can starts like this:
class Decorator(Component):
_component: Component = None
def __init__(self, component: Component) -> None:
self._component = component
@property
def component(self) -> Component:
return self._component
def operation(self) -> str:
return self._component.operation()
Is the _component necessary? Can't we just remove it together with the @property method and just initialize it to None inside the __init()__ method?
class Decorator(Component):
def __init__(self, component: Component = None) -> None:
self.component = component
def operation(self) -> str:
return self.component.operation()
Enlighten me.
UserEcho 的客户支持
To be honest, the Python decorator example is just not how it is done in Python at all. This is all you need:
import functools from typing import Callable def custom_decorator(func: Callable): @functools.wraps(func) def _decorator(*args, **kwargs): # pre-call decorating functionality value = func(*args, **kwargs) # post-call decorating functionality return value return _decorator @custom_decorator def decorated_function(): # do something ...