Comma separator between JSON objects with json.dump

Question

I am fiddling around with outputting a json file with some attributes of the files within a directory. My problem is, when appending to the file there is no separator betwe

Answer 1

I had the same problem because I needed to yield objects into a file because I didn't want to load the whole list of objects into memory. Here's my approach (but I think it's a bit hacky though):

json_begin = '{"objects":['
json_end = ']}'

with open('file_data.txt', 'a') as outfile:
   files = os.listdir(os.curdir)

   outfile.write(json_begin)

   for f in files:

       extension = os.path.splitext(f)[1][1:]
       base = os.path.splitext(f)[0]
       name = f

       data = {
           "file_name" : name,
           "extension" : extension,
           "base_name" : base
       }

       json.dump(data, outfile)
       if f != files[-1]:
           outfile.write(',')

   outfile.write(json_end)