python定时清空本目录下除本脚本外的全部文件

import os,sys
import shutil
import time
def clear():
  cur_file = os.path.basename(sys.argv[0])
  dir_content = [x for x in os.listdir(".") if x != cur_file]
  for f in dir_content:
    if os.path.isdir(f):
      shutil.rmtree(f)
    else:
      os.remove(f)

if __name__ == "__main__":
  dt = "2017-10-25 10:58:54"
  timeArray = time.strptime(dt, "%Y-%m-%d %H:%M:%S")
  timestamp = time.mktime(timeArray)
#  print(timestamp)
  while True:
    now_time = time.time()
    time.sleep(60)
    if(now_time>timestamp):
      clear()
      exit()