def validate_user(self, username, password, client, request, *args, **kwargs):
        raise NotImplementedError('Subclasses must implement this method.')
Returns the upper-right coordinate.
dataset/ETHPy150Open idan/oauthlib/oauthlib/oauth2/rfc6749/request_validator.py/RequestValidator.validate_user--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/contrib/gis/gdal/envelope.py/Envelope.ur