python - 线程忽略 KeyboardInterrupt 异常

Question

我正在运行这个简单的代码:

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('\n! Received keyboard interrupt, quitting threads.\n')

但是当我运行它时，它会打印出来

$ 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？

Answer 1

试试

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

没有调用time.sleep，主进程太早跳出try...except block ，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。

thread.daemon=True 导致线程在主进程结束时终止。