详解Python 多线程 Timer定时器/延迟执行、Event事件

class Timer(Thread):
 def __init__(self, interval, function, args=None, kwargs=None):
  Thread.__init__(self)
  self.interval = interval
  self.function = function
  self.args = args if args is not None else []
  self.kwargs = kwargs if kwargs is not None else {}
  self.finished = Event()
 def cancel(self):
  """Stop the timer if it hasn't finished yet."""
  self.finished.set()
 def run(self):
  self.finished.wait(self.interval)
  if not self.finished.is_set():
   self.function(*self.args, **self.kwargs)
  self.finished.set()

import threading
import time
def add(x,y):
 print(x+y)
t = threading.Timer(10,add,args=(4,5))
t.start()
time.sleep(2)
t.cancel()
print("===end===")

import threading
import logging
import time
logging.basicConfig(level=logging.INFO)
# class MyTimer(threading.Thread):
class MyTimer:
 def __init__(self,interval,fn,args=None):
  self.interval = interval
  self.fn = fn
  self.args = args
  self.event = threading.Event()
 def start(self):
  threading.Thread(target=self.__do).start()
 def cancel(self):
  self.event.set()
 def __do(self):
  self.event.wait(self.interval)
  if not self.event.is_set():
   self.fn(*self.args)
def add(x,y):
 logging.warning(x+y)
t = MyTimer(5,add,(4,5))
t.start()
# time.sleep(2)
# t.cancel()

def __init__(self):
  self._cond = Condition(Lock())
  self._flag = False
 def _reset_internal_locks(self):
  self._cond.__init__(Lock())
 def is_set(self):
  return self._flag
 isSet = is_set
 def set(self):
  with self._cond:
   self._flag = True
   self._cond.notify_all()
 def clear(self):
  with self._cond:
   self._flag = False
 def wait(self, timeout=None):
  with self._cond:
   signaled = self._flag
   if not signaled:
    signaled = self._cond.wait(timeout)
   return signaled 

import threading
import logging
import time
logging.basicConfig(level=logging.INFO)
cups = []
event = threading.Event()#event对象
def boss(e:threading.Event):
 if e.wait(30):#最多等待30秒
  logging.info('Good job.')
def worker(n,e:threading.Event):
 while True:
  time.sleep(0.5)
  cups.append(1)
  logging.info('make 1')
  if len(cups) >=n:
   logging.info('I finished my job. {}'.format(len(cups)))
   e.set()#flag设置为True
   break
b = threading.Thread(target=boss,name='boos',args=(event,))
w = threading.Thread(target=worker,args=(10,event))
w.start()
b.start()

import threading
import logging
logging.basicConfig(level=logging.INFO)
def do(event:threading.Event,interval:int):
 while not event.wait(interval): # not event.wait(1) = True
  logging.info('To do sth.')
e = threading.Event()
t = threading.Thread(target=do,args=(e,1))
t.start()
e.wait(10) # 也可以使用time.sleep(10)
e.set()
print('Man Exit.')

Timer(interval, function, args=[], kwargs={}) 
　　interval: 指定的时间 
　　function: 要执行的方法 
　　args/kwargs: 方法的参数

# encoding: UTF-8
import threading
def func():
  print 'hello timer!'
timer = threading.Timer(5, func)
timer.start()