Python，如果条件为真x的时间量 [英] Python if condition true for x amount of time

问题描述

我想创建一个条件，该条件仅在a为True的情况下执行超过3秒钟.我希望它像这样工作.

I would like to create a condition that only gets executed if a is True for more than 3 seconds. I would like it to work like this.

if a == True for more than 3 seconds:
   dosomething

推荐答案

如果要检查该值3秒钟没有变化.

If you want to check if the value hasn't change for 3 seconds.

import time
id_a_old = id(a)
time.sleep(3)
id_a_new = id(a)
if id_a_old == id_a_new: # assumes that a is initially true
   dosomething

由于布尔类型是不可变的，因此如果更改，则对象ID也将更改.

Since bool type is immutable the object id changes if it gets changed.

如果要在3秒钟后检查是否已更改，请执行以下操作.如果任何线程在3秒内更改 a ，它将捕获该信息.

If you want to check if is has changed after 3 seconds do the following. If any thread changes a within 3 seconds it will capture that.

import time
time.sleep(3)
if a:
   dosomething

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