new_contents: import six
  
  
  class SubscriptableType(type):
      def __getitem__(self, key):
          return self
  
  
  @six.add_metaclass(SubscriptableType)
  class CheckedPMap(object):
      pass
  
  
  @six.add_metaclass(SubscriptableType)
  class CheckedPSet(object):
      pass
  
  
  @six.add_metaclass(SubscriptableType)
  class CheckedPVector(object):
      pass
  
  
  @six.add_metaclass(SubscriptableType)
  class PBag(object):
      pass
  
  
  @six.add_metaclass(SubscriptableType)
  class PDeque(object):
      pass
  
  
  @six.add_metaclass(SubscriptableType)
  class PList(object):
      pass
  
  
  @six.add_metaclass(SubscriptableType)
  class PMap(object):
      pass
  
  
  @six.add_metaclass(SubscriptableType)
  class PSet(object):
      pass
  
  
  @six.add_metaclass(SubscriptableType)
  class PVector(object):
      pass
  
subject: Add shell class for type checkers