code: def parse(cls, json):
          # type: (dict) -> Any
          
          effect = json.get('effect')
          if effect:
              from pykechain.models.validators import effects
              effect_implementation_classname = effect[0].upper() + effect[1:]
              if hasattr(effects, effect_implementation_classname):
                  return getattr(effects, effect_implementation_classname)(json=json)
              else:
                  raise Exception('unknown effect in json')
          raise Exception("Effect unknown, incorrect json: '{}'".format(json))
docs: Parse a json dict and return the correct subclass of :class:`ValidatorEffect`.
  
          It uses the 'effect' key to determine which :class:`ValidatorEffect` to instantiate.
          Please refer to :class:`enums.ValidatorEffectTypes` for the supported effects.
  
          :param json: dictionary containing the specific keys to parse into a :class:`ValidatorEffect`
          :type json: dict
          :returns: the instantiated subclass of :class:`ValidatorEffect`
          :rtype: :class:`ValidatorEffect` or subclass