Getting 'int' object is not iterable

Question

    cat_sums[cat] += value
TypeError: \'int\' object is not iterable

My input is this:

defaultdict(, {\'composed\'         


        

Answer 1

If anyone is getting this error inside a Django template …

When you do:

{% for c in cat_sums.keys %}

then, behind the scenes, the Django template language first tries a cat_sums['keys'] lookup. Normally this would fail and Django would next look for a method. But since this is a defaultdict, the default value gets stored instead.

If the dict was created with

cat_sums = defaultdict(int)

What gets executed is:

for c in cat_sums['keys']:

i.e.,

for c in 0:

which quite rightly throws an error as the value 0 is not iterable.

Resolution? Pass dict(cat_sums) inside the context so the view gets a regular dict.