Paste for NDJSON documents

ndjpaste.py

import sys
import json
import itertools

fnames = sys.argv[1:]

jsons = [(json.loads(i) for i in open(fname)) for fname in fnames]

def paste(iterables):
    for docs in itertools.izip_longest(*iterables, fillvalue={}):
        for other in docs[1:]:
            docs[0].update(other)
        yield docs[0]

for doc in paste(jsons):
    print json.dumps(doc)