code: def _fromJSON(cls, jsonobject):
          
          newInstance = cls(None, None)
          newInstance.__dict__.update(jsonobject)
          return newInstance
docs: Generates a new instance of :class:`maspy.core.Si` from a decoded
          JSON object (as generated by :func:`maspy.core.Si._reprJSON()`).
  
          :param jsonobject: decoded JSON object
  
          :returns: a new instance of :class:`Si`