Python Google Images Downloader

#!/usr/bin/python
#Usage: google.py QUERY PAGES DOWNLOAD_LOCATION
import urllib2
import json
import sys
import string
def format_filename(s):
    valid_chars = "-_.() %s%s" % (string.ascii_letters, string.digits)
    filename = ''.join(c for c in s if c in valid_chars)
    return filename
query = urllib2.quote(str(sys.argv[1]))
pages_scan = 1
pages_scan = int(sys.argv[2])
count = 0
save_loc = str(sys.argv[3])
accepted_filetypes = ['jpeg','jpg','png','bmp','gif']
if pages_scan > 8:
    print('\033[93m> Google API has a limit of 8 pages, pages to scan set to 8\033[0m')
    pages_scan = 8
for x in range(0, int(pages_scan)):
    print('\033[94mPage: %s\033[0m' % (x+1))
    url = ('https://ajax.googleapis.com/ajax/services/search/images?v=1.0&q=%s&rsz=8&start=%s' % (query,count+(x*8)))
    request = urllib2.Request(url, None, {'Referer': 'None'})
    response = urllib2.urlopen(request)
    results = json.load(response)
    for post in results['responseData']['results']:
        print('> %s' % post['url'])
        try:
            req = urllib2.Request(post['url'], headers={'User-Agent' : "Fozilla Mirefox"})
            u = urllib2.urlopen(post['url'])
            mime = (u.info().getheader('Content-Type').split('/')[1])
            if mime.endswith(tuple(accepted_filetypes)):
                ofile = open('%s/%s.%s' % (save_loc,format_filename(post['titleNoFormatting']),mime), 'w')
                ofile.write(u.read())
                ofile.close()
        except:
            print('\033[93m> Invalid Page (500 Error?)\033[0m')