Problem with Stack Exchange API JSON data

gistfile1.py

        stack_exchange_api = 'https://api.stackexchange.com/2.1'
        request_url = "{0}/users/{1}/associated".format(
            stack_exchange_api, usernames['stack_exchange'])
        api_request = urllib2.Request(
            request_url,
            headers={"Accept": "application/json"})
        api_response = urllib2.urlopen(api_request)
        se_accounts_json = json.load(api_response)
        se_answers = 0  # Number of answers given on SE sites
        pprint.pprint(se_accounts_json)
        for site in se_accounts_json['items']:
            se_answers += site['answer_count']