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Copy pathtimer_recursive_setinterval.py
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executable file
·42 lines (35 loc) · 1.38 KB
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"""
python的threading.Timer更像是js的setTimeout
如果想要setInterval的效果需要死循环内不断调用或者递归调用
由于死循环会阻塞线程，若线程还有别的任务会导致interval变大/不准确
定时器的句柄定义成全局变量，创建的定时器进程和实例不会因为递归调用而堆积
"""
from threading import Timer
class SetInterval:
timer_1: Timer
timer_2: Timer
stop_timer_flag: bool = False
@staticmethod
def fn_1():
print('Call fn_1')
# threading.Timer约等于JS的setTimeout
# 递归调用setTimeout可以实现setInterval
SetInterval.timer_1 = Timer(interval=1, function=SetInterval.fn_1)
SetInterval.timer_1.start()
@staticmethod
def fn_2():
print('Call fn_2')
SetInterval.timer_2 = Timer(interval=1, function=SetInterval.fn_2)
SetInterval.timer_2.start()
@staticmethod
def stop_all():
assert SetInterval.timer_1 is not None
assert SetInterval.timer_2 is not None
print("stop_all")
# 在setTimeout的回调没被执行时，把timer关掉停掉递归调用setTimeout
SetInterval.timer_1.cancel()
SetInterval.timer_2.cancel()
if __name__ == '__main__':
SetInterval.fn_1()
SetInterval.fn_2()
Timer(interval=4, function=SetInterval.stop_all).start()