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import osimport reimport sysargs = sys.argv[1:]if len(args) not in (2, 3, 4, 5):    print 'Usage: get.py site name [index] [prefix] [number]'    sys.exit()number = Noneif len(args) == 2:    site, name = argselif len(args) == 3:    if args[2].isdigit():        site, name, number = args    else:        site, name, prefix = argselif len(args) == 4:    site, name, prefix, number = argselif len(args) == 5:    site, name, index, prefix, number = argslogfile = open('log.txt', 'a')print >>logfile, ' '.join(args)logfile.close()metafile = open('meta.txt', 'r')for line in metafile:    if line.strip() == site:        breakmeta = {}for line in metafile:    if not line.strip():        break    key, value = line.split()    meta[key] = valuemetafile.close()if not os.path.exists(site):    os.mkdir(site)dir = os.path.join(site, name)if os.path.isdir(dir):    print 'Directory exists!'    sys.exit()os.mkdir(dir)urlfilename = os.path.join(dir, 'url')urlfile = open(urlfilename, 'w')index_pattern = meta['Index']argcount = index_pattern.count('%')if argcount == 1: url = index_pattern % nameelif argcount == 2: url = index_pattern % (name, index)print >>urlfile, urlurlfile.close()image_pattern = meta['Image']argcount = image_pattern.count('%')number = number or meta['Number']number = int(number)for i in range(1, number+1):    if argcount == 2: image = image_pattern % (name, i)    elif argcount == 3: image = image_pattern % (name, prefix, i)    filename = os.path.join(dir, '%02d.jpg' % i)    command = 'curl -e %s -s %s -o %s &' % (url, image, filename)    os.system(command)