线程忽略 KeyboardInterrupt 异常

threading ignores KeyboardInterrupt exception(线程忽略 KeyboardInterrupt 异常)

问题描述

我正在运行这个简单的代码:

I'm running this simple code:

import threading, time

class reqthread(threading.Thread):    
    def run(self):
        for i in range(0, 10):
            time.sleep(1)
            print('.')

try:
    thread = reqthread()
    thread.start()
except (KeyboardInterrupt, SystemExit):
    print('
! Received keyboard interrupt, quitting threads.
')

但是当我运行它时，它会打印出来

But when I run it, it prints

$ python prova.py
.
.
^C.
.
.
.
.
.
.
.
Exception KeyboardInterrupt in <module 'threading' from '/usr/lib/python2.6/threading.pyc'> ignored

事实上，python 线程忽略了我的 Ctrl+C 键盘中断并且不打印 Received Keyboard Interrupt.为什么?这段代码有什么问题?

In fact python thread ignore my Ctrl+C keyboard interrupt and doesn't print Received Keyboard Interrupt. Why? What is wrong with this code?

推荐答案

试试

try:
  thread=reqthread()
  thread.daemon=True
  thread.start()
  while True: time.sleep(100)
except (KeyboardInterrupt, SystemExit):
  print '
! Received keyboard interrupt, quitting threads.
'

没有调用time.sleep，主进程太早跳出try...except块，所以KeyboardInterrupt 没有被捕获.我的第一个想法是使用 thread.join，但这似乎会阻塞主进程(忽略 KeyboardInterrupt)，直到 thread 完成.

Without the call to time.sleep, the main process is jumping out of the try...except block too early, so the KeyboardInterrupt is not caught. My first thought was to use thread.join, but that seems to block the main process (ignoring KeyboardInterrupt) until the thread is finished.

thread.daemon=True 导致线程在主进程结束时终止.

thread.daemon=True causes the thread to terminate when the main process ends.

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