Cannot recognize query whose operation name contains space

[ExHix]

I met a query whose operation name contains space

schema = Schema(query=Query)
result = schema.execute(
    '''
      query user login ($un: String, $pw: String) {
        r: User (username: $un, password: $pw) {
          id, username, token
        }
      }
    ''',
    variables={'un': "test", 'pw': "123"}
)
print(result.data)

This code printed out None.
But if I remove this space, everything works fine. I wonder if it is graphene itself issue.

[erikwrede]

http://spec.graphql.org/draft/#sec-Names
Spaces are not allowed in GraphQL names.

[erikwrede]

But there should be an error in result.errors!