:mod:`altgraph` --- A Python Graph Library ================================================== .. module:: altgraph :synopsis: A directional graph for python altgraph is a fork of `graphlib <http://pygraphlib.sourceforge.net>`_ tailored to use newer Python 2.3+ features, including additional support used by the py2app suite (modulegraph and macholib, specifically). altgraph is a python based graph (network) representation and manipulation package. It has started out as an extension to the `graph_lib module <http://www.ece.arizona.edu/~denny/python_nest/graph_lib_1.0.1.html>`_ written by Nathan Denny it has been significantly optimized and expanded. The :class:`altgraph.Graph.Graph` class is loosely modeled after the `LEDA <http://www.algorithmic-solutions.com/enleda.htm>`_ (Library of Efficient Datatypes) representation. The library includes methods for constructing graphs, BFS and DFS traversals, topological sort, finding connected components, shortest paths as well as a number graph statistics functions. The library can also visualize graphs via `graphviz <http://www.research.att.com/sw/tools/graphviz/>`_. .. exception:: GraphError Exception raised when methods are called with bad values of an inconsistent state.