如果我要在 Python 中實現一個安全的資源包裝器，我是否需要像 C# 一樣實現Dispose 模式？這是我的意思的演示實現：class ResourceWrapper:    def __init__(self):        self._python_resource = ...  # A Python object that manages some resources.        self._external_resource = _allocate_resource()  # A resource handle to an external resource.        self._is_closed = False  # Whether the object has been closed.    def __del__(self):        self._close(manual_close=False)  # Called by GC.    def close(self):        self._close(manual_close=True)  # Called by user to free resource early.    def _close(self, manual_close):        if not self._is_closed:  # Don’t want a resource to be closed more than once.            if manual_close:                # Since `_close` is called by user, we can guarantee that `self._python_resource` is still valid, so we                # can close it safely.                self._python_resource.close()             else:                # This means `_close` is called by GC, `self._python_resource` might be already GCed, but we don’t know                # for sure, so we do nothing and rely on GC to free `self._python_resource`.                pass            # GC will not take care of freeing unmanaged resource, so whether manual close or not, we have to close the            # resource to prevent leaking.            _free_resource(self._external_resource)            # Now we mark the object as closed to prevent closing multiple times.            self._is_closed = Trueself._python_resource是一個由 Python GC 管理的資源包裝器對象，self._external_resource是一個不受 Python GC 管理的外部資源的句柄。如果用戶手冊關閉包裝器，我想確保托管和非托管資源都被釋放，如果包裝器對象被 GC，它們也會被釋放。