A tiny python thing to split big json files into smaller junks.

json-split.py

#!/usr/bin/env python 
# based on  http://stackoverflow.com/questions/7052947/split-95mb-json-array-into-smaller-chunks
# usage: python json-split filename.json
# produces multiple filename_0.json of 1.49 MB size

import json
import sys

with open(sys.argv[1],'r') as infile:
    o = json.load(infile)
    chunkSize = 4550
    for i in xrange(0, len(o), chunkSize):
        with open(sys.argv[1] + '_' + str(i//chunkSize) + '.json', 'w') as outfile:
            json.dump(o[i:i+chunkSize], outfile)

what if I don't know about chunkSize value?