Method __copy__

Lib/collections/__init__.py:1313–1318

(self)

        return self

    def __copy__(self):
        inst = self.__class__.__new__(self.__class__)
        inst.__dict__.update(self.__dict__)
        # Create a copy and avoid triggering descriptors
        inst.__dict__["data"] = self.__dict__["data"][:]
        return inst

    def append(self, item):
        self.data.append(item)