python - 设置信号处理程序时如何防止在 : 中忽略异常？

Question

有这个代码:

def signal_handler(signal, frame):
    print("exiting")
    sys.exit(0)

if __name__ == "__main__":
    signal.signal(signal.SIGINT, signal_handler)

    threads_arr = []
    for i in list:
        t = threading.Thread(target=myFunc, args=(i))
        threads_arr.append(t)
        t.start()

如何在按 Ctrl+C 时防止出现这种情况

Exception ignored in: <module 'threading' from '/usr/lib/python3.4/threading.py'>
Traceback (most recent call last):
  File "/usr/lib/python3.4/threading.py", line 1294, in _shutdown
    t.join()
  File "/usr/lib/python3.4/threading.py", line 1060, in join
    self._wait_for_tstate_lock()
  File "/usr/lib/python3.4/threading.py", line 1076, in _wait_for_tstate_lock
    elif lock.acquire(block, timeout):
  File "./script.py", line 28, in signal_handler
    sys.exit(0)
SystemExit: 0

其中第 28 行指向 sys.exit(0) ?

编辑
尝试添加 t.join() 后(或 t.join(1) )在最后 for在 main 中循环尽管我必须按 Ctrl+C 才能收到此错误并退出程序，但我得到了相同的结果。

Answer 1

问题是你没有set your threads to be daemons并且您没有加入线程，因此当主线程死亡时，其余线程继续在后台运行。

如果您将代码编辑为如下所示，那么它将起作用:

import signal
import threading
import sys

def signal_handler(signal, frame):
    print("exiting")
    sys.exit(0)

if __name__ == "__main__":
    signal.signal(signal.SIGINT, signal_handler)

    threads_arr = []
    for i in list:
        t = threading.Thread(target=myFunc, args=(i))
        threads_arr.append(t)
        t.daemon = True # die when the main thread dies
        t.start()
    for thr in threads_arr: # let them all start before joining
        thr.join()