python下載網頁上的flash

'''
Created on 2012-7-18

@author: Administrator
'''
import sys

def output(s):
    sys.stderr.write(s + "\n")
    
argc = len(sys.argv)
if argc == 2:
    format = 'super'
elif argc == 3:
    format = sys.argv[2]
else:
    output("Usage: %s videourl [videoquality=normal|high|super|...]" % sys.argv[0])
    output(" e.g.");
    output("   %s http://v.youku.com/v_show/id_XMzMzMjE0MjE2.html super" % sys.argv[0])
    exit(1)
    
videourl = sys.argv[1]

import urllib2
import urllib
url = 'http://www.flvcd.com/parse.php?kw=' + urllib.quote(videourl)  + '&format=' + format

req = urllib2.Request(url)

req.add_header("host", "www.flvcd.com")
req.add_header("Referer", url[:-4])
req.add_header('User-Agent', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0) Gecko/20100101 Firefox/4.0')
req.add_header('Accept-Language', 'en-us,en;q=0.5')
req.add_header('Accept-Encoding', 'gzip, deflate')
req.add_header('Accept-Charset', 'ISO-8859-1,utf-8;q=0.7,*;q=0.7')
req.add_header('Keep-Alive', '115')

res = urllib2.urlopen(req)
html = res.read()

import re
pattern = re.compile('<input\s+type="hidden"\s+name="inf"\s+value="([^"]+)')
firstmatch = pattern.search(html)
urls = firstmatch.group(1)
urls = unicode(urls, 'gbk')

urlpattern = re.compile('<[NU]>(.+)');
result = urlpattern.findall(urls)

data = [result[i:i+2] for i in range(0, len(result), 2)]
count = len(data)
files = []

output('\n--- Start to download from url "%s" (%d block(s) in total):' % (videourl, count))
for k, v in enumerate(data):
    output('  >downloading Block %.2d of %.2d ...' % (k+1, count))
    urllib.urlretrieve(v[1], v[0] + '.flv')
    files.append( (v[0] + '.flv').replace('"', '\\"').replace('$', '\$').encode('utf-8') )
    output('  downloaded Block.%.2d completely<' % (k+1,))
output('--- finished ---\n')
print('"' + '" "'.join(files) + '"')