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Python 3.x 如何在python中重写dict[]操作？

python-3.x

Python 3.x 如何在python中重写dict[]操作？,python-3.x,Python 3.x,我想在字典里存储某种对象。该对象有一个名为“lastAccessDate”的属性，每当程序访问该对象时，我希望该对象的属性更新到当前系统时间，如下所示 def getValue(key): obj = objectDict.get(key,None) if obj is not None: obj.lastAccessDate = getSystemDate() return obj 程序必须通过这个api来访问对象，否则这将是一个bug。我希望我可以像

我想在字典里存储某种对象。该对象有一个名为“lastAccessDate”的属性，每当程序访问该对象时，我希望该对象的属性更新到当前系统时间，如下所示

def getValue(key):
    obj = objectDict.get(key,None)
    if obj is not None:
        obj.lastAccessDate = getSystemDate()
    return obj
程序必须通过这个api来访问对象，否则这将是一个bug。我希望我可以像操作普通dict一样操作dict，当我使用objectDict[key]或objectDict.get（）访问密钥时，它将自动执行此操作。如何在python中实现它？

您可以重新实现或提供
[]
通过
\uuuuu getitem\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu


您可以通过
\uuuuu getitem\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu>重新实现或提供
[
访问器，该访问器将使您的自定义对象成为