如何用键的输入来中断python中的循环，但不停止循环以验证每次执行时是否输入了循环

Question

while(True):
print("Enter to the bucle")
with open('the_file.txt', 'w') as f:
f.write('Hello world!n')
f.close()
#if at some point during the execution of this loop press the letter, for example the key q, that a break is set and the while () loop closes

我发现的问题是，如果我使用input((并将键保存为字符串，这将在键盘输入等待点停止循环，但我要寻找的是，它没有停止等待键盘输入的点，只是如果在某个点按下q，循环将结束，不会再次执行

Answer 1

使用线程的示例代码。我们在后台运行任务，并在另一个线程中解析键/输入的用户输入。

is_interrupt_task = True将中断任务，否则即使主线程已经退出也不会中断。

代码

import logging
import threading
import time
format = '%(asctime)s: %(message)s'
logging.basicConfig(format=format, level=logging.INFO, datefmt='%H:%M:%S')

def task(name):
logging.info(f'Thread {name}: starting')
for i in range(10):
time.sleep(i)
logging.info(f'Thread {name}: sleeps for {i}s')
logging.info(f'Thread {name}: task is completed.')

if __name__ == "__main__":
# Run task in the background.
is_interrupt_task = True
mytask = threading.Thread(target=task, args=(1,), daemon=is_interrupt_task)
mytask.start()
logging.info('starting main loop ...')
while True:  
userinput = input()
command = userinput.strip()
if command:  # almost all keys
logging.info("main quits")
break
# if command == 'q':
# logging.info("main quits")
# break

示例任务被中断

16:12:29: Thread 1: starting
16:12:29: starting main loop ...
16:12:29: Thread 1: sleeps for 0s
16:12:30: Thread 1: sleeps for 1s
16:12:32: Thread 1: sleeps for 2s
16:12:35: Thread 1: sleeps for 3s
q
16:12:36: main quits

允许完成示例任务

is_interrupt_task = False

16:11:12: Thread 1: starting
16:11:12: starting main loop ... 
16:11:12: Thread 1: sleeps for 0s
16:11:13: Thread 1: sleeps for 1s
16:11:15: Thread 1: sleeps for 2s
16:11:18: Thread 1: sleeps for 3s
q
16:11:22: main quits
16:11:22: Thread 1: sleeps for 4s
16:11:27: Thread 1: sleeps for 5s
16:11:33: Thread 1: sleeps for 6s
16:11:40: Thread 1: sleeps for 7s
16:11:48: Thread 1: sleeps for 8s
16:11:57: Thread 1: sleeps for 9s
16:11:57: Thread 1: task is completed.