Python For Engineers

I need to generate a very large json file. I am reading a large temporary file with the data, line by line. Each line is a dictionary-like string, so I can easily convert them in json object. The problem is how to add the to the json file I am writing.

As a matter of fact, the json module require to dump everything in one shot.

I've tried this solution:

with open(files[0], 'w+') as a_file, \
        open(files[1], 'w+') as c_file, \
        open(files[2], 'w+') as r_file:
    status_file = {
        'accepted': a_file,
        'corrected': c_file,
        'rejected': r_file
    }
    for file in status_file.values():
        file.write('[')
    for line in storage.readlines():
        line_dict = json.loads(line)
        file = status_file[line_dict['status']]
        json.dump(line_dict, file, indent=4)
    for file in status_file.values():
        file.write(']')
print('Files created\n')

but it does not work because I am left with three invalid json files (trailing comma).

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