Python read and write JSON files

#! /usr/bin/env python2.7

import json
import glob
import copy

producers = []

for filename in glob.glob('new/*.json'):
    fileobj = open(filename, "r")
    stringContents = fileobj.read()
    jsonObj = json.loads(stringContents)
    producers = producers + jsonObj["Producers"]

unique = [producers[0]]
data = {}
data['Producers'] = []

for producer in producers:
    matches = 0
    for element in unique:
        if producer["addr"] == element["addr"] and producer["port"] == element["port"]:
            matches = 1
            break
    if matches == 0:
        data['Producers'].append(producer)
        new = [producer]
        unique = unique + new


with open('testnext-topology.json', 'w') as outfile:
    json.dump(data, outfile, indent=4)