FormDiagram.edge_attribute

FormDiagram.edge_attribute(key, name, value=None)[source]

Get or set an attribute of an edge.

Parameters:

  • key (tuple[hashable, hashable]) – The identifier of the edge as a pair of node identifiers.

  • name (str) – The name of the attribute.

  • value (obj, optional) – The value of the attribute.

Returns:

object | None – The value of the attribute, or None when the function is used as a “setter”.

Raises:

KeyError – If the edge does not exist.