def clean_perm_list(self):
        self.cleaned_data['permission'] = reduce(lambda x,y: int(x)|int(y),self.cleaned_data['perm_list'])
Convert the list of number strings into a single integer value
dataset/ETHPy150Open callowayproject/django-objectpermissions/objectpermissions/admin.py/PermissionModelForm.clean_perm_list