queue.py 文件源码

def append(self, container):
        """Insert objects at the end of the container"""
        if not isinstance(container, collections.MutableSequence):
            container = [container]

        for x in container:
            try:
                self._container.remove(x)
            except ValueError:
                pass
            self._container.append(x)

        if self._current is None and any(self._container):
            self._current = self._container[0]