This documents an unmaintained version of NetworkX. Please upgrade to a maintained version and see the current NetworkX documentation.

Source code for networkx.exception

# -*- coding: utf-8 -*-

Base exceptions and errors for NetworkX.

__author__ = """Aric Hagberg (hagberg@lanl.gov)\nPieter Swart (swart@lanl.gov)\nDan Schult(dschult@colgate.edu)\nLoïc Séguin-C. <loicseguin@gmail.com>"""
#    Copyright (C) 2004-2011 by
#    Aric Hagberg <hagberg@lanl.gov>
#    Dan Schult <dschult@colgate.edu>
#    Pieter Swart <swart@lanl.gov>
#    All rights reserved.
#    BSD license.

# Exception handling

# the root of all Exceptions
[docs]class NetworkXException(Exception): """Base class for exceptions in NetworkX."""
[docs]class NetworkXError(NetworkXException): """Exception for a serious error in NetworkX"""
[docs]class NetworkXPointlessConcept(NetworkXException): """Harary, F. and Read, R. "Is the Null Graph a Pointless Concept?" In Graphs and Combinatorics Conference, George Washington University. New York: Springer-Verlag, 1973. """
[docs]class NetworkXAlgorithmError(NetworkXException): """Exception for unexpected termination of algorithms."""
[docs]class NetworkXUnfeasible(NetworkXAlgorithmError): """Exception raised by algorithms trying to solve a problem instance that has no feasible solution."""
[docs]class NetworkXNoPath(NetworkXUnfeasible): """Exception for algorithms that should return a path when running on graphs where such a path does not exist."""
[docs]class NetworkXUnbounded(NetworkXAlgorithmError): """Exception raised by algorithms trying to solve a maximization or a minimization problem instance that is unbounded."""
class NetworkXNotImplemented(NetworkXException): """Exception raised by algorithms not implemented for a type of graph."""