json.load() in Python 3

[Larz60+]

try (using f-string (if your python 3.6 or newer)):

for id in id_list:
    with open(f'location{id}') as fp:
        data = json.load(fp)

if using python 3 older than 3.6 use:

for id in id_list:
    with open(f'location{}'.format(id)) as fp:
        data = json.load(fp)

FYI: please use 4 space indentation