如何使用触发器停止无限循环？答案

【问题标题】：How can I stop the infinite loop with a trigger?如何使用触发器停止无限循环？
【发布时间】：2021-07-02 19:57:29
【问题描述】：

我希望程序一直播放声音，直到用户自己停止程序。

我的代码：

import pathlib,time
from pydub import AudioSegment
from pydub.playback import play
from gtts import gTTS

english=["school", "book", "theater"]
select = str(input("press ENTER to Start Stop=>'s':"))
elements=('', 'p')
while True:  
    if select not in elements:
        print("Please Correct Selection--")
        continue
    elif select in elements:
        for pick in english:
            index = english.index(pick)
            eng = pick
            print(index, "-> ", eng)
            text_eng = eng
            my_eng_obj = gTTS(text=eng, lang="en", slow=False)
            text_eng = text_eng.replace(" ", "_")
            try:
                file_en = pathlib.Path(text_eng + ".mp3")
                if file_en.exists():
                    song_s = AudioSegment.from_mp3(file_en)
                    play(song_s)
                    pass
                else:
                    my_eng_obj.save(text_eng + ".mp3")
                    song_s = AudioSegment.from_mp3(file_en)
                    play(song_s)
            except:
                pass
            time.sleep(0.2)

声音部分工作正常。我需要无限循环部分。如何通过输入打断？

【问题讨论】：

标签： python triggers infinite-loop

【解决方案1】：

试试这个：

trigger = False


while True:  # infinite loop
    # Do something
    # Do something to make trigger True. Keep it false if you want to keep the loop running
    if 1 + 1 == 2:  # Example comparison
        trigger = True
    print("Hello World")
    if trigger:
        break

【讨论】：

【解决方案2】：

你可以试试这个：

# Modify user message
select = str(input("press ENTER to Start Stop=>CTRL+C:"))

# Use a try/except within the while loop
while True:
    try:
        if select not in elements:
            # ...
        elif select in elements:
            # ...
    except KeyboardInterrupt:
        break

【讨论】：

谢谢你，@Laurent 我试过了，但我无法得到结果。我有一个 mac 操作系统，也许这就是原因。：/

【解决方案3】：

这是解决方案之一

import time
from pynput import keyboard

print("Press Enter ==> Start\n"
      "Press p   ==> Exit")

check = ''
def Start(key):
    if key == keyboard.Key.enter:
        print("Started")
        return False
def Stop(key):
    global check
    if key==keyboard.KeyCode(char='p'):
        check = 'stop'
        return False
with keyboard.Listener(on_release=Start) as listener:
    listener.join()
    listener = keyboard.Listener(on_release=Stop)
    listener.start()
while True:
    print("Do Something:Test")
    time.sleep(1)
    if check == 'stop':
        print("\nLoop Stopped...!")
        break

【讨论】：