请问如何让python进行urllib2的多线程检查[符代码]

xingsu1021

如题，文件可以用多线程读出来 ，但是读出后 还是1个个的去检查，还请帮忙
web.py
#!/usr/bin/env python
#coding=utf-8

import urllib
import urllib2
from time import ctime
from checkfd import check_report

def check_url(url_name):
    try:
        h=urllib2.HTTPHandler(debuglevel=0)
        opener = urllib2.build_opener(h)
        request = urllib2.Request(url_name)
        feeddata = opener.open(request, timeout = 2).read()
        return True
    except urllib2.URLError, e:
        return False
   
replog = check_report()
   
def report_url(url_name):
    protocol = 'http://'
    url_name = url_name
    url = protocol + url_name
    f= file(replog, 'a+')
    if check_url(url):
        print "%s find" % url
    else:
        sl = "# " + ctime() + "错误，无法访问 %s\n" % url
        f.write(sl)
    f.close()

check_report
#检查report文件
def check_report():
    dir_patch = os.path.join(os.path.dirname(__file__),'report')
    if os.path.isdir(dir_patch):
        report_patch = os.path.join(dir_patch,'report.log')
        if os.path.isfile(report_patch):
            return report_patch
        else:
            f= file(report_patch, 'w')
            f.write('#输出检查报告\n')
            f.close()
            return report_patch
    else:
        os.mkdir(dir_patch)

主文件
#!/usr/bin/env python
#coding=utf-8

import threading
from time import ctime, sleep
import string
import os
import sys
from web import report_url

class rf(object):
    #得到文件的全路径和文件名
    file_patch = os.path.join(os.path.dirname(__file__),'test2.txt')
    #以读写模式打开文件
    f = open(file_patch, 'r+')
    d = []
    def fb(self):
        #每次读取文件的1行
        try:
            for eachLine in self.f:
                #print eachLine.split()[1]
                report_url(eachLine.split()[1])
                #self.d.append(eachLine.split()[1])
        #文件读完后的异常
        except ValueError, e:
            pass
        self.f.close()
        
if __name__ == '__main__':
    fa = rf()
    ct = []
    for i in xrange(1,5):
        #t = threading.Thread(target = report_url, args = ab)
        t = threading.Thread(target = fa.fb())
        #t = threading.Thread(target = report_url, args = [fa.fb()])
        t.setDaemon(1)
        t.start()
        ct.append(t)
    for t in ct:
        t.join()