如何从socket.timeout异常处理程序中捕获键盘中断

Question

我正在尝试开发一个简单的套接字服务器，它具有非阻塞接受(使用settimeout(，但我希望能够使用Ctrl-C(键盘中断(停止它。

我的代码是这样的：

import socket
host = '127.0.0.1'
port = 5000
s = socket.socket()
s.settimeout(1)
s.bind((host, port))
s.listen(1)
print('Server started')
while True:
    try:
        conn, addr = s.accept()
    except socket.timeout:
        pass
    except Exception as exc:
        print(str(exc))
        print('Server closing')
        s.close()
        break
    except KeyboardInterrupt:
        print('Server closing')
        s.close()
        break
    else:
        print('Connection from', addr)

但是 KeyboardInterrupt 永远不会被捕获，因为它发生在 socket.timeout 异常处理程序内。这是按 Ctrl-C 时的输出

c:UsersJMatosMEOCloudPython>python file_server.py
Server started
Traceback (most recent call last):
  File "file_server.py", line 40, in <module>
    conn, addr = s.accept()
  File "C:Python35-32libsocket.py", line 195, in accept
    fd, addr = self._accept()
socket.timeout: timed out
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "file_server.py", line 40, in <module>
    conn, addr = s.accept()
KeyboardInterrupt

有没有办法在套接字中捕获键盘中断异常.timeout 异常处理程序？

我的环境是Windows 7P + SP1 x64，Python 3.5.2 32b。

提前感谢，

JM

Answer 1

问题不在于套接字超时。问题在于您希望抛出异常的位置。 将代码更改为：

try:
    while True:
        try:
            conn, addr = s.accept()
        except socket.timeout:
             pass
        except Exception as exc:
             print(str(exc))
             print('Server closing')
             s.close()
             break
    else:
        print('Connection from', addr)
except KeyboardInterrupt:
    print('Server closing')
    s.close()