def _crop(self, image, width, height, x_offset, y_offset):
        return image.crop((x_offset, y_offset,
                           width + x_offset, height + y_offset))
Opening zipped files in a writeable mode should fail.
dataset/ETHPy150Open gtaylor/django-athumb/athumb/pial/engines/pil_engine.py/PILEngine._crop--crossover with--dataset/ETHPy150Open spacetelescope/PyFITS/pyfits/tests/test_core.py/TestFileFunctions.test_open_zipped_writeable