code: def from_swagger(cls, pclass_for_definition, name, definition):
          
          return cls(
              name=name,
              doc=definition.get(u"description", name),
              attributes=cls._attributes_for_definition(
                  pclass_for_definition,
                  definition,
              ),
          )
docs: Create a new ``_ClassModel`` from a single Swagger definition.
  
          :param pclass_for_definition: A callable like
              ``Swagger.pclass_for_definition`` which can be used to resolve
              type references encountered in the definition.
  
          :param unicode name: The name of the definition.
  
          :param definition: The Swagger definition to model.  This will be a
              value like the one found at ``spec["definitions"][name]``.
  
          :return: A new model for the given definition.