code: def _safe_match_string(value):
      
      if not isinstance(value, six.string_types):
          if isinstance(value, bytes):  # should only happen in py3
              value = value.decode('utf-8')
          else:
              raise GraphQLInvalidArgumentError(u'Attempting to convert a non-string into a string: '
                                                u'{}'.format(value))
  
      # Using JSON encoding means that all unicode literals and special chars
      # (e.g. newlines and backslashes) are replaced by appropriate escape sequences.
      # JSON has the same escaping rules as MATCH / SQL, so no further escaping is necessary.
      return json.dumps(value)
docs: Sanitize and represent a string argument in MATCH.