如何正确设置sys.exceptbook

Question

我编写了以下代码来理解多进程环境中的sys.exceptbook。我使用的是python 3。我已经创建了两个进程，它们将打印并等待获得ctrl+c。

from multiprocessing import Process
import multiprocessing
import sys
from time import sleep

class foo:
def f(self, name):
try:
raise ValueError("test value error")
except ValueError as e:
print(e)
print('hello', name)
while True:
pass

def myexcepthook(exctype, value, traceback):
print("Value: {}".format(value))
for p in multiprocessing.active_children():
p.terminate()

def main(name):
a = foo()
a.f(name)
sys.excepthook = myexcepthook
if __name__ == '__main__':
for i in range(2):
p = Process(target=main, args=('bob', ))
p.start()

当我按下ctrl+C时，我期待着以下结果

python /home/test/test.py
test value error
hello bob
test value error
hello bob
Value: <KeyboardInterrupt>

但不幸的是，我得到了以下结果。

/home/test/venvPython3/bin/python /home/test/test.py
test value error
hello bob
test value error
hello bob
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
Process Process-1:
File "/usr/lib/python3.6/multiprocessing/popen_fork.py", line 28, in poll
pid, sts = os.waitpid(self.pid, flag)
KeyboardInterrupt
Traceback (most recent call last):
File "/usr/lib/python3.6/multiprocessing/process.py", line 258, in _bootstrap
self.run()
File "/usr/lib/python3.6/multiprocessing/process.py", line 93, in run
self._target(*self._args, **self._kwargs)
File "/home/test/test.py", line 26, in main
a.f(name)
File "/home/test/test.py", line 15, in f
pass
KeyboardInterrupt
Process Process-2:
Traceback (most recent call last):
File "/usr/lib/python3.6/multiprocessing/process.py", line 258, in _bootstrap
self.run()
File "/usr/lib/python3.6/multiprocessing/process.py", line 93, in run
self._target(*self._args, **self._kwargs)
File "/home/test/test.py", line 26, in main
a.f(name)
File "/home/test/test.py", line 15, in f
pass
KeyboardInterrupt
Process finished with exit code 0

如果有人能指出我做错了什么，那将是一个很大的帮助。此外，请让我知道如何获得预期的输出。

Answer 1

你几乎做到了。首先，使用exctype打印：

def myexcepthook(exctype, value, traceback):
print("Value: {}".format(exctype))
for p in multiprocessing.active_children():
p.terminate()

join()创建了流程，以防止过早退出

if __name__ == '__main__':
pr = []
for i in range(2):
p = Process(target=main, args=('bob', ))
p.start()
pr.append(p)
for p in pr:
p.join()