FormDiagram.face_attribute¶
- 
FormDiagram.face_attribute(key, name, value=None)¶ Get or set an attribute of a face.
- Parameters
 key (int) – The face identifier.
name (str) – The name of the attribute.
value (obj, optional) – The value of the attribute.
- Returns
 object or None – The value of the attribute, or
Nonewhen the function is used as a “setter”.- Raises
 KeyError – If the face does not exist.