Python套接字连接超时问题
我正在尝试编写一个简单的脚本，连接到 freenode IRC 网络（端口 6667 上的 irc.freenode.net），以定期在频道上发布信息。为此，我使用 Python 套接字。这在过去工作得很好，但是现在我遇到了一个奇怪的问题：套接字需要非常长的时间才能连接（如果它确实连接的话）（偶尔会超时）。但是，只有当脚本从文件运行时才会发生这种情况。当直接输入解释器时，它工作正常：
>>> import socket
>>> def f():
>>> s = socket.socket()
>>> print("Connecting")
>>> s.connect(('irc.freenode.net', 6667))
>>> print("Connected")
>>> s.close()
>>> f()
套接字在大约一秒钟内连接，一切都很好。但是，如果我将以下代码放入文件中并运行 python test.py，它会挂在 s.connect 上并且偶尔会超时：
import socket
s = socket.socket()
print("Connecting")
s.connect(('irc.freenode.net', 6667))
print("Connected")
s.close()
我以前从未遇到过此问题。我网络上的其他计算机上也会出现这种情况（也许是网络问题？）。我正在使用Python 3.2。谢谢。
I'm trying to write a simple script that connects to the freenode IRC network (irc.freenode.net on port 6667) to periodically post information on a channel. To do this, I am employing Python sockets. This has worked fine in the past, however now I am experiencing a strange problem: the socket takes an incredibly long time to connect if it does at all (it occasionally times out). However, this only happens when the script is run from a file. When typed into the interpretor directly it works fine:
>>> import socket
>>> def f():
>>> s = socket.socket()
>>> print("Connecting")
>>> s.connect(('irc.freenode.net', 6667))
>>> print("Connected")
>>> s.close()
>>> f()
The socket connects in about a second and everything is fine. However, if I put the following code in a file and run python test.py, it hangs on s.connect and occasionally times out:
import socket
s = socket.socket()
print("Connecting")
s.connect(('irc.freenode.net', 6667))
print("Connected")
s.close()
I have never had this problem before. This also occurs on other computers on my network (maybe it's network problem?). I'm using Python 3.2. Thanks.
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网络总是会出现间歇性问题，您的代码需要处理这些问题。我建议采取两个层面的行动。首先，在
socket.create_connection上使用timeout=参数，在放弃之前等待一段时间。然后将套接字打开放入tryexcept socket.timeout对中并重试几次，可能在重试之间休眠一两秒。Networks always have intermittent problems and your code will need to deal with them. I suggest two levels of action. First, use the
timeout=argument onsocket.create_connectionto wait a bit longer before giving up. Then put the socket opening inside atryexcept socket.timeoutpair and retry a couple of times, maybe sleeping a second or two between retries.