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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get(self, block=True, timeout=None):
 """Get a node off the inner priority queue. By default, this blocks. This takes the lock, but only for part of it. :param bool block: If True, block until the inner queue has data :param Optional[float] timeout: If set, block for timeout seconds waiting for data. :return ParsedNode: The node as present in the manifest. See `queue.PriorityQueue` for more information on `get()` behavior and exceptions. """

        _, node_id = self.inner.get(block=block, timeout=timeout)
        with self.lock:
            self._mark_in_progress(node_id)
        return self.get_node(node_id)