Python 在另一个按钮调用的函数中，如何检测gpiozero按钮按下？

我需要从按下按钮触发继电器，等待信号，然后释放继电器。在下面的示例代码中，该信号为b2。我对Python和Pi还不熟悉，但玩得很开心！：）

---

当按钮调用的现有功能仍在运行时，如何检测按钮按下？

在此解决方案中，您只需打开和关闭输出

from gpiozero import Button
from signal import pause
import time

pin = #Set a pin
r = LED(pin)
b1 = Button(23)
b1.when_pressed = r.on
b2 = Button(24)
b2.when_pressed = r.off

pause()

---

这里有一个线程开始执行以下操作：

from gpiozero import Button
from signal import pause
import time
import _thread

run = False
def do_stuff():
    while run: #do stuff...
        time.sleep(1)
        print("waiting...")

def first_button():
    global run
    print("First Pressed")
    run = True
    _thread.start_new_thread(do_stuff)
    

def second_button():
    global run
    print("Second Pressed")
    run = False

b1 = Button(23)
b1.when_pressed = first_button
b2 = Button(24)
b2.when_pressed = second_button

pause()

---

这是有意义的，尽管看起来_thread已经被threading模块替换了，所以我需要更改代码来运行它。“ImportError:没有名为_thread的模块”您正在运行哪个版本？在3.7之前，它是一个可选模块

from gpiozero import Button
from signal import pause
import time
import _thread

run = False
def do_stuff():
    while run: #do stuff...
        time.sleep(1)
        print("waiting...")

def first_button():
    global run
    print("First Pressed")
    run = True
    _thread.start_new_thread(do_stuff)
    

def second_button():
    global run
    print("Second Pressed")
    run = False

b1 = Button(23)
b1.when_pressed = first_button
b2 = Button(24)
b2.when_pressed = second_button

pause()