code: def _filter_image(self, url):
          "The param is the image URL, which is returned if it passes all the filters."
          return reduce(lambda f, g: f and g(f), 
          [
              filters.AdblockURLFilter()(url),
              filters.NoImageFilter(),
              filters.SizeImageFilter(),
              filters.MonoImageFilter(),
              filters.FormatImageFilter(),
          ]f _filter_image(self, url):
          "The param is the image URL, which is returned if it passes all the filters."
          return reduce(lambda f, g: f and g(f), 
          [
              filters.AdblockURLFilter()(url),
              filters.NoImageFilter(),
              filters.SizeImageFilter(),
              filters.MonoImageFilter(),
              filters.FormatImageFilter(),
          ])
docs: The param is the image URL, which is returned if it passes all the filters.