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Usage
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To use grapho in a project::

    import grapho


To create a Directed Graph:: 

    from grapho.digraph import DirectedGraph

    g = DirectedGraph()


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Functions
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To add a node::
    
    g.add_node('a')


To add an edge::

    g.add_edge('node_1', 'node_2') # default weight
    g.add_edge('node_1', 'node_2', 4.0) # provide weight as argument


To delete a node::

    g.delete_node('a')


To delete an edge::

    g.delete_edge('node_1', 'node_2')



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Properties
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Count of number of nodes::

    g.node_count


Count of number of edges::

    g.edge_count


List of nodes::

    g.nodes


Return Graph in dictionary form::

    g.graph