python开启多个子进程并行运行的方法

from multiprocessing import Processimport sys, osimport timedef timetask(times):  time.sleep(times)  print time.localtime()def works(func, arg, worknum):  proc_record = []  for i in range(worknum):    p = Process(target = func, args = (arg,))    p.start()    proc_record.append(p)  for p in proc_record:    p.join()if __name__ == '__main__':  arg = 5  procs = 4  works(timetask, arg, procs)