_objfinalizer.py 文件源码

def __new__(cls, *args, **kwargs):
            """Creates a new object instance and adds the private finalizer
            attributes to it.

            Returns: new object instance

            Arguments:
            * *args, **kwargs -- passed to the parent instance creator
                                 (which ignores them)
            """
            # Note:   Do not pass a (hard) reference to instance to the
            #         finalizer as func/args/kwargs, it'd keep the object
            #         alive until the program terminates.
            #         A weak reference is fine.
            #
            # Note 2: When using weakrefs and not calling finalize() in
            #         __del__, the object may already have disappeared
            #         when weakref.finalize() kicks in.
            #         Make sure that _finalizer() gets called,
            #         i.e. keep __del__() from the base class.
            #
            # Note 3: the _finalize_called attribute is (probably) useless
            #         for this class
            instance = super(AutoFinalizedObject, cls).__new__(
                cls, *args, **kwargs
            )

            instance._finalizer = weakref.finalize(
                instance, _do_finalize_object_ref, weakref.ref(instance)
            )

            return instance