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bzrlib/deprecated_graph.py
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        """Return a dictionary of graph node:ancestor_list entries."""
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        return dict(self._graph_ancestors.items())
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    def get_ancestry(self, node_id):
 
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    def get_ancestry(self, node_id, topo_sorted=True):
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        """Return the inclusive ancestors of node_id in topological order."""
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        # maybe optimise this ?
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        result = {}
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            for parent in parents:
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                if parent not in result and parent not in pending:
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                    pending.add(parent)
 
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        if not topo_sorted:
 
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            return result.keys()
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        return topo_sort(result.items())
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    def get_descendants(self):