Python延迟指定时间执行特定任务脚本

from datetime import date, time, datetime, timedelta
import time

def hello():
  print "hello world."

def runTask(func, day=0, hour=0, min=5, second=0):
  # get current time
  now = datetime.now()
  strnow = now.strftime('%Y-%m-%d %H:%M:%S')
  print "now:",strnow
  # get net_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:
      now = datetime.now()
      strnow = now.strftime('%Y-%m-%d %H:%M:%S')
      # if system time eq next_time run the specific task(hello func)
      if str(strnow) == str(strnext_time):
          print strnow
          func()
          print "task done."
          break

runTask(hello, min=3)

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