python每隔一段时间做一个事情

 #!/usr/bin/env python
 #coding:utf8
 #Author:lsp
 #Date:下午2:17:54
 #Version:0.1
 #Function: 每隔一段时间做一个事情
 from datetime import date, time, datetime, timedelta

 #要做的事情
 def work():
   print "hello world."

 def runTask(func, day=0, hour=0, min=0, second=0):
   # Init time
   now = datetime.now()
   strnow = now.strftime('%Y-%m-%d %H:%M:%S')
   print "now:",strnow
   # First next run time
   period = timedelta(days=day, hours=hour, minutes=min, seconds=second)
   next_time = now + period
   strnext_time = next_time.strftime('%Y-%m-%d %H:%M:%S')
   print "next run:",strnext_time
   while True:
       # Get system current time
       iter_now = datetime.now()
       iter_now_time = iter_now.strftime('%Y-%m-%d %H:%M:%S')
       if str(iter_now_time) == str(strnext_time):
           # Get every start work time
           print "start work: %s" % iter_now_time
           # Call task func
           work()
           print "task done."
           # Get next iteration time
           iter_time = iter_now + period
           strnext_time = iter_time.strftime('%Y-%m-%d %H:%M:%S')
           print "next_iter: %s" % strnext_time
           # Continue next iteration
           continue

 # runTask(work, min=0.5)
 runTask(work(), day=0, hour=0, min=0,second=10)