get an item out of the queue

        .. note::

            if `block` is ``True`` (the default) and the queue is
            :meth`empty`, this method will block the current coroutine until
            something has been :meth:`put`.

        :param block:
            whether to block if there is no data yet available (default
            ``True``)
        :type block: bool
        :param timeout:
            the maximum time in seconds to block waiting for data. with the
            default of ``None``, can wait indefinitely. this is unused if
            `block` is ``False``.
        :type timeout: int, float or None

        :raises:
            :class:`Empty` if there is no data in the queue and block is
            ``False``, or `timeout` expires

        :returns: something that was previously :meth:`put` in the queue

def get(self, block=True, timeout=None):
        """get an item out of the queue

        .. note::

            if `block` is ``True`` (the default) and the queue is
            :meth`empty`, this method will block the current coroutine until
            something has been :meth:`put`.

        :param block:
            whether to block if there is no data yet available (default
            ``True``)
        :type block: bool
        :param timeout:
            the maximum time in seconds to block waiting for data. with the
            default of ``None``, can wait indefinitely. this is unused if
            `block` is ``False``.
        :type timeout: int, float or None

        :raises:
            :class:`Empty` if there is no data in the queue and block is
            ``False``, or `timeout` expires

        :returns: something that was previously :meth:`put` in the queue
        """
        if not self._data:
            if not block:
                raise Empty()

            current = compat.getcurrent()

            waketime = None if timeout is None else time.time() + timeout
            if timeout is not None:
                scheduler.schedule_at(waketime, current)
            self._waiters.append((current, waketime))

            scheduler.state.mainloop.switch()

            if timeout is not None:
                if not scheduler._remove_timer(waketime, current):
                    self._waiters.remove((current, waketime))
                    raise Empty()

        if self.full() and self._waiters:
            scheduler.schedule(self._waiters.popleft()[0])

        return self._get()