code: def from_json(cls, json_obj):
          
          if isinstance(json_obj, str):
              json_obj = json.loads(json_obj)
  
          type = None
          time = None
          data = None
          if cls.TYPE_FIELD_NAME in json_obj:
              type = json_obj[cls.TYPE_FIELD_NAME]
  
          if cls.TIME_FIELD_NAME in json_obj:
              time = json_obj[cls.TIME_FIELD_NAME]
          else:
              raise InvalidEventError("{field} must be present!".format(
                  field=cls.TIME_FIELD_NAME))
  
          if cls.DATA_FIELD_NAME in json_obj:
              data = json_obj[cls.DATA_FIELD_NAME]
  
          return cls(type, time, data)
docs: Build an Event from JSON.
  
          :param json_obj: JSON data representing a Cube Event
          :type json_obj: `String` or `json`
          :throws: `InvalidEventError` when any of time field is not present
          in json_obj.