old_contents: import graphene
  
  class Person(graphene.Interface):
      name = graphene.String()
      age = graphene.ID()
  
  class Patron(Person):
      id = graphene.ID()
  
  class Query(graphene.ObjectType):
  
      patron = graphene.Field(Patron)
  
      def resolve_patron(self, args, info):
          return Patron(id=1, name='Demo')
  
  schema = graphene.Schema(query=Query)
  query = '''
      query something{
        patron {
          id
          name
        }
  }
  '''
  result = schema.execute(query)
  # Print the result
  print result.data['patron']
  
  
  
new_contents: import graphene
  
  
  class Person(graphene.Interface):
      name = graphene.String()
      age = graphene.ID()
  
  
  class Patron(Person):
      id = graphene.ID()
  
  
  class Query(graphene.ObjectType):
  
      patron = graphene.Field(Patron)
  
      def resolve_patron(self, args, info):
          return Patron(id=1, name='Demo')
  
  schema = graphene.Schema(query=Query)
  query = '''
      query something{
        patron {
          id
          name
        }
  }
  '''
  result = schema.execute(query)
  # Print the result
  print result.data['patron']
  
subject: Fix flake8 issues in field example