Python- parse .txt files with multiple dictionaries

Question

I have the following as a.txt file

{"a": 1, "b": 2, "c": 3}
{"d": 4, "e": 5, "f": 6}
{"g": 7, "h": 8, "i": 9}

How can I use python to open the file, and write a comma to separate each dictionary? Ie what regular expression can find every instance of "} {" and put a comma there?

(the real file is much larger (~10GB), and this issue prevents the file from being a syntactically correct JSON object that I can parse with json.loads())

Answer 1

You can use str.join with ',' as the delimeter, using a line-by-line file read in a generator expression. Then put [] around the contents to make it valid json.

import json
with open(filename, 'r') as f:
    contents = '[' + ','.join(line for line in f) + ']'

data = json.loads(n)

This results in data

[
    {'a': 1, 'b': 2, 'c': 3},
    {'d': 4, 'e': 5, 'f': 6},
    {'g': 7, 'h': 8, 'i': 9}
]