This documents the development version of NetworkX. Documentation for the current release can be found here.


categorical_edge_match(attr, default)

Returns a comparison function for a categorical edge attribute.

The value(s) of the attr(s) must be hashable and comparable via the == operator since they are placed into a set([]) object. If the sets from G1 and G2 are the same, then the constructed function returns True.

  • attr (string | list) – The categorical edge attribute to compare, or a list of categorical edge attributes to compare.

  • default (value | list) – The default value for the categorical edge attribute, or a list of default values for the categorical edge attributes.


match – The customized, categorical edge_match function.

Return type



>>> import networkx.algorithms.isomorphism as iso
>>> nm = iso.categorical_edge_match("size", 1)
>>> nm = iso.categorical_edge_match(["color", "size"], ["red", 2])