Cell.edge_attribute
- Cell.edge_attribute(edge, name, value=None)
 Get or set an attribute of an edge.
- Parameters
 edge (2-tuple of int) – The identifier of the edge as a pair of vertex identifiers.
name (str) – The name of the attribute.
value (obj, optional) – The value of the attribute. Default is
None.
- Returns
 object or None – The value of the attribute, or
Nonewhen the function is used as a “setter”.- Raises
 KeyError – If the edge does not exist.