write_json_streaming_style.py

import json
from itertools import pairwise

def sentinel(iterable):
    for x in iterable:
        yield x
    yield None

def write_json_streaming_style(generator, indent=4):
    print("[")
    for cur,post in pairwise(sentinel(generator)):
        text = json.dumps(cur, ensure_ascii=False, indent=indent)
        if post:
            text += ","
        for line in text.split("\n"):
            print(" " * indent + line)
    print("]")