def _add_image(self, uri, site):
        return self.__class__.__add_image(uri, self.__class__.__name__, site)

    ## abstract functions
step should be incremented when we go to the next page
dataset/ETHPy150Open k4cg/nichtparasoup/crawler/__init__.py/Crawler._add_image--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.3/django/contrib/formtools/tests/__init__.py/WizardTests.test_step_increments