def __len__(self):
        return len(self.entries)
Try to determine the current system user's username.
dataset/ETHPy150Open guoguo12/billboard-charts/billboard.py/ChartData.__len__--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/contrib/auth/management/__init__.py/get_system_username