old_contents: from __future__ import absolute_import
  
  from uuid import UUID as _UUID
  
  from graphql.language import ast
  
  from .scalars import Scalar
  
  
  class UUID(Scalar):
      """UUID"""
  
      @staticmethod
      def serialize(uuid):
          if isinstance(uuid, str):
              uuid = _UUID(uuid)
          assert isinstance(uuid, _UUID), "Expected UUID instance, received {}".format(
              uuid
          )
          return str(uuid)
  
      @staticmethod
      def parse_literal(node):
          if isinstance(node, ast.StringValue):
              return _UUID(node.value)
  
      @staticmethod
      def parse_value(value):
          return _UUID(value)
  
new_contents: from __future__ import absolute_import
  import six
  from uuid import UUID as _UUID
  
  from graphql.language import ast
  
  from .scalars import Scalar
  
  
  class UUID(Scalar):
      """UUID"""
  
      @staticmethod
      def serialize(uuid):
          if isinstance(uuid, six.string_types):
              uuid = _UUID(uuid)
  
          assert isinstance(uuid, _UUID), "Expected UUID instance, received {}".format(
              uuid
          )
          return str(uuid)
  
      @staticmethod
      def parse_literal(node):
          if isinstance(node, ast.StringValue):
              return _UUID(node.value)
  
      @staticmethod
      def parse_value(value):
          return _UUID(value)
  
subject: Make UUID compatible (Fixed issue #936) (#937)