“object of type 'NoneType' has no len()” error

Question

I\'m seeing weird behavior on this code:

images = dict(cover=[],second_row=[],additional_rows=[])

for pic in pictures:
    if len(images[\'cover\']) == 0:
              


        

Answer 1

your problem is that

if len(images['cover']) == 0:

checks the LENGTH of the value of images['cover'] what you meant to do is check if it HAS a value.

do this instead:

if not images['cover']: