code: def apply(self, data, path=None, applicator=None):
          
  
          if applicator:
              applicator.pset = self
          else:
              applicator = Applicator(self)
  
          return applicator.apply(data, path=path)
docs: Apply permissions in this set to the provided data, effectively
          removing all keys from it are not permissioned to be viewed
  
          Arguments:
  
          data -- dict of data
  
          Returns:
  
          Cleaned data