Python implements the timer timer method through threads
- 2020-04-02 14:41:55
- OfStack
This article illustrates python's method of implementing timer timer with threads. Share with you for your reference. Specific analysis is as follows:
This python class implements a timer effect that is very simple to invoke and allows the system to periodically execute a specified function
Here's how to implement the timer using the threading module.
Do a simple experiment before using:
import threading
def sayhello():
print "hello world"
global t #Notice: use global variable!
t = threading.Timer(5.0, sayhello)
t.start()
t = threading.Timer(5.0, sayhello)
t.start()
The operation results are as follows:
>python hello.py
hello world
hello world
hello world
The following is the implementation of the timer class:
class Timer(threading.Thread):
"""
very simple but useless timer.
"""
def __init__(self, seconds):
self.runTime = seconds
threading.Thread.__init__(self)
def run(self):
time.sleep(self.runTime)
print "Buzzzz!! Time's up!"
class CountDownTimer(Timer):
"""
a timer that can counts down the seconds.
"""
def run(self):
counter = self.runTime
for sec in range(self.runTime):
print counter
time.sleep(1.0)
counter -= 1
print "Done"
class CountDownExec(CountDownTimer):
"""
a timer that execute an action at the end of the timer run.
"""
def __init__(self, seconds, action, args=[]):
self.args = args
self.action = action
CountDownTimer.__init__(self, seconds)
def run(self):
CountDownTimer.run(self)
self.action(self.args)
def myAction(args=[]):
print "Performing my action with args:"
print args
if __name__ == "__main__":
t = CountDownExec(3, myAction, ["hello", "world"])
t.start()
The above code is passed by running in Python 2.5.4
I hope this article has helped you with your Python programming.