File: __init__.py

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"""
An example of persistence for a directed graph structure.   The graph is stored as a collection of edges, each referencing both a "lower" and an "upper" node in a table of nodes.  Basic persistence and querying for lower- and upper- neighbors are illustrated::

    n2 = Node(2)
    n5 = Node(5)
    n2.add_neighbor(n5)
    print n2.higher_neighbors()

"""