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首页 > 解决方案 > 为什么在使用 F1 键停止代码后按 Enter 键时此代码不打印 Hi？

python - 为什么在使用 F1 键停止代码后按 Enter 键时此代码不打印 Hi？

问题描述

from pynput import keyboard
import time
break_program = True
def on_press(key):
    global break_program
    print (key)
    if key == keyboard.Key.f1:
        print ('end pressed')
        break_program = False
        return True
    elif key == keyboard.Key.enter:
        print ('enter pressed')
        break_program = True
        return True
    else:
        return True
print("Press 'F1' key to stop the bot.")
print("Press enter to start the bot.")
with keyboard.Listener(on_press=on_press) as listener:
    while break_program == True:
        print('Hi')
        time.sleep(1)
    listener.join()

此代码应在按下时停止运行，F1并应在Enter按下时运行。

按下Enter时，它进入elif状态并打印enter pressed，但不打印Hi，因为break_program分配回True

样本输出：

Press 'F1' key to stop the bot.
Press enter to start the bot.
Hi
Hi
Hi
Hi
Key.f1
end pressed
Key.enter
enter pressed

输出应该如何：

Press 'F1' key to stop the bot.
Press enter to start the bot.
Hi
Hi
Hi
Hi
Key.f1
end pressed
Key.enter
enter pressed
Hi
Hi
...

标签： pythonpython-3.xpynput

解决方案

您应该使用非阻塞线程，并且您的代码应该是：

from pynput import keyboard
import time
break_program = True
def on_press(key):
    global break_program
    print (key)
    if key == keyboard.Key.f1 and break_program:
        print ('end pressed')
        break_program = False

    if key == keyboard.Key.enter:
        print ('enter pressed')
        break_program = True


print("Press 'F1' key to stop the bot.")
print("Press enter to start the bot.")

listener =  keyboard.Listener(on_press=on_press)
listener.start()
while True:
    if break_program:
        print("Hi")
        time.sleep(1)

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