Get screen names from Twitter REST API given file of user ids.

gistfile1.py

import sys
import urllib2
import simplejson

def get_names(user_ids):
    output_file = open('output.txt', 'a')
    get_string = 'https://api.twitter.com/1/users/lookup.json?user_id={0}'.format(user_ids)
    req = urllib2.Request(get_string)
    try:
        f = urllib2.urlopen(req)
        response = f.read()
        response = simplejson.loads(response)
        for user in response:
            output_file.write(user['screen_name'] + '\n')
    except urllib2.HTTPError, e:
        print e
    output_file.close()


if (len(sys.argv) > 1):
    file_name = sys.argv[1]

    input_file = open(file_name, 'r+')
    lines = input_file.readlines()
    user_ids = ''
    count = 0
    for line in lines:
        if line:
            line = line.strip()
            user_ids += line + ','
            count += 1
            if count == 99:
                get_names(user_ids)
                user_ids = ''
                count = 0
    if user_ids:
        get_names(user_ids)
    input_file.close()