match error_log and access_log tailing

tailf.py

import tailer
import time
import datetime
import re
dt = datetime.timedelta(0, 1)
with file('/var/log/httpd/error_log') as error_log:
    with file('/var/log/httpd/access_log') as access_log:
        tailer_error_log = tailer.follow(error_log, 0)
        tailer_access_log = tailer.follow(access_log, 0)
        error_log_queue = []
        access_log_queue = []
        while 1:
            nothing = True
            line = tailer_error_log.next()
            if line:
                m = re.match(r'\[(.{24})\] \[([^\]]*)\] \[client ([^\]]*)', line)
                error_log_queue.append((datetime.datetime.strptime(m.group(1), "%a %b %d %H:%M:%S %Y"), m.group(3), line))
                nothing = False
            line = tailer_access_log.next()
            if line:
                m = re.match(r'([^ ]*) - ([^ ]*) \[(.{20})', line)
                if not m: print line
                access_log_queue.append((datetime.datetime.strptime(m.group(3), "%d/%b/%Y:%H:%M:%S"), m.group(1), line))
                if len(access_log_queue) > 50: del access_log_queue[0]
                nothing = False
            if nothing:
                time.sleep(1)
                continue
            if error_log_queue:
                error_log_s = error_log_queue[0]
                found = False
                for access_log_s in access_log_queue:
                    if error_log_s[1] == access_log_s[1] and \
                        error_log_s[0] >= access_log_s[0]-dt and \
                        error_log_s[0] <= access_log_s[0]+dt:
                        print access_log_s[2]
                        found = True
                if found:
                    print error_log_s[2]
                    print '---'
                    del error_log_queue[0]
                else:
                    print 'cannot find match request for'
                    print error_log_queue[0]