python函数防抖与节流

防抖:

几秒内只允许外部调用一次,调越多等越长

节流:

几秒内只会内部运行一次,到点后才会再运行,比如贤者时间

代码实现

from threading import Timer

class setTimeOut:
    _timer = Timer
    def __init__(self,fn,delay,args=None,kwargs=None) -> None:
        self._timer = Timer(delay,fn,args,kwargs)
        self._timer.start()
    
    def clear(self):
        self._timer.cancel()
    
    def is_finished(self):
        return self._timer.finished.is_set()
    
class debounce:#防抖
    timer:setTimeOut = None
    def __init__(self,func,delay) -> None:
        self.func = func
        self.delay = delay
    def __call__(self,*args,**kwargs):
        if self.timer is not None:
            self.timer.clear()
        self.timer=setTimeOut(self.func,self.delay,args,kwargs)

class throttle:#节流
    timer:setTimeOut = None

    def __init__(self,func,delay) -> None:
        self.func = func
        self.delay = delay
    def __call__(self,*args,**kwargs):
        if (self.timer is None) or self.timer.is_finished():
            self.timer=setTimeOut(self.func,self.delay,args,kwargs)


def bar(*args,**kwargs):
    print('bar called','args=',args,'kwargs=',kwargs)

bar_debed = debounce(bar,2)
bar_debed(1,funcName='deb_first')
bar_debed(2,funcName='deb_sec')
bar_debed(3,funcName='deb_thi')

bar_throtted = throttle(bar,0.01)
for x in range(1000):
    for y in range(1000):
        bar_throtted(funcName = 'throtted' ,x = x,y = y)

最后输出:

bar called args= () kwargs= {'funcName': 'throtted', 'x': 0, 'y': 0}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 30, 'y': 249}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 77, 'y': 213}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 147, 'y': 944}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 200, 'y': 291}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 261, 'y': 536}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 299, 'y': 930}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 362, 'y': 893}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 396, 'y': 957}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 477, 'y': 723}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 559, 'y': 93}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 627, 'y': 148}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 692, 'y': 625}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 774, 'y': 30}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 858, 'y': 866}
bar called args= () kwargs= {'funcName': 'throtted', 'x': 923, 'y': 414}
bar called args= (3,) kwargs= {'funcName': 'deb_thi'}