@property 
    def field_widths(self):
        return [get_field_width(get_field_defn(self._ldefn, i))
                for i in xrange(self.num_fields)]
Returns a list of the maximum field widths for the features.
dataset/ETHPy150Open dcramer/django-compositepks/django/contrib/gis/gdal/layer.py/Layer.field_widths