python subprocess.Popen() error - 


def run_mitmdump(basename, timeout, logging=false):      port = get_free_port()     print(port)      if not port:  # cannot free port         return none, none      dump_file = "%s.dmp" % basename     cmd_re_dir = ''  # redirecting stderr stdout , teeing     quite_option = '-q'  # mitmdump option quiet - no log      if logging:         mitm_log_file = "%s.%s" % (basename, mitm_log_extension)         cmd_re_dir = ' 2>&1 |tee %s' % mitm_log_file  # redirect output log file         quite_option = ''  # don't want quite!      cmd = 'timeout %s mitmdump %s -z --anticache -p %s -w %s %s' % (timeout, quite_option, port, dump_file, cmd_re_dir)     # -z: try convince servers send uncompressed data. mitmdump -h | grep "\-z" info      wl_log.info('mitmdump cmd %s' % cmd)     subp = subprocess.popen(cmd, shell=true)  # shell=true - must careful     return port, subp.pid   def init_mitmproxy(basename, timeout, logging):     try:         port, pid = run_mitmdump(basename, timeout + 1, logging)  # runs mitmdump process timeout+1 sec     except:         wl_log.critical('exception initializing mitmdump')     else:         wl_log.info('mitmdump listen on port %s, pid %s' % (port, pid))     print(port)     return "127.0.0.1:%s " % port if port , pid else ""

when program executed subprocess.popen(cmd,shell=true) error occurred , print('abc')、"return port,subp.pid" not performed。 there no return value in second function port, pid = run_mitmdump(basename, timeout + 1, logging)

the error message is:

2017-08-20 19:17:39,428 - error - exception in worker function (362,'wideinfo.org') local variable 'port' referenced before assignment     traceback (most recent call last):          file "agents.py", line 212, in crawl_worker             proxy_opt = mitm.init_mitmproxy(stdout_log[:-4], agent_cfg['timeout'], agent_cfg['mitm_proxy_logs']) if agent_cfg['use_mitm_proxy'] else ""          file "/home/vagrant/fpdetective/src/crawler/mitm.py", line 85, in init_mitmproxy         print(port)      unboundlocalerror: local variable 'port' referenced before assignment


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