[PYTHON/COMMON] WeakValueDictionary 클래스 : 약한 참조 딕셔너리 사용하기

■ WeakValueDictionary 클래스를 사용해 약한 참조 딕셔너리 사용하는 방법을 보여준다.

▶ om.py


import weakref

class ObjectManager:
    def __init__(self):
        self.weakValueDictionary = weakref.WeakValueDictionary()

    def AddObject(self, sourceObject):
        sourceObjectID = id(sourceObject)
        self.weakValueDictionary[sourceObjectID] = sourceObject
        return sourceObjectID

    def GetObject(self, objectID):
        try:
            return self.weakValueDictionary[objectID]
        except:
            return None

import weakref

class ObjectManager:

def __init__(self):

self.weakValueDictionary = weakref.WeakValueDictionary()

def AddObject(self, sourceObject):

sourceObjectID = id(sourceObject)

self.weakValueDictionary[sourceObjectID] = sourceObject

return sourceObjectID

def GetObject(self, objectID):

try:

return self.weakValueDictionary[objectID]

except:

return None

▶ main.py


import om

class Apple:
    pass

apple1 = Apple()

apple1.Color = "빨강"

objectManager = om.ObjectManager()

redID = objectManager.AddObject(apple1)

apple2 = objectManager.GetObject(redID)

print(apple1 is apple2) # True
print(apple2.Color) # 빨강

import om

class Apple:

pass

apple1 = Apple()

apple1.Color = "빨강"

objectManager = om.ObjectManager()

redID = objectManager.AddObject(apple1)

apple2 = objectManager.GetObject(redID)

print(apple1 is apple2) # True

print(apple2.Color) # 빨강