python 定时器,轮询定时器的实例

python 定时器默认定时器只执行一次，第一个参数单位S，几秒后执行

import threading
 
def fun_timer():
 print('Hello Timer!')
 
timer = threading.Timer(1, fun_timer)
timer.start()

改成以下可以执行多次

建立loop_timer.py

from threading import _Timer
class LoopTimer(_Timer):
 """Call a function after a specified number of seconds: 
 
 
   t = LoopTi
   mer(30.0, f, args=[], kwargs={}) 
   t.start() 
   t.cancel()  # stop the timer's action if it's still waiting 
 
 
 """
 
 def __init__(self, interval, function, args=[], kwargs={}):
  _Timer.__init__(self, interval, function, args, kwargs)
 
 def run(self):
  '''self.finished.wait(self.interval) 
  if not self.finished.is_set(): 
   self.function(*self.args, **self.kwargs) 
  self.finished.set()'''
  while True:
   self.finished.wait(self.interval)
   if self.finished.is_set():
    self.finished.set()
    break
   self.function(*self.args, **self.kwargs)

调用

t = LoopTimer(120, fun_timer)
  t.start()

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