Test specific error number from a Python socket exception

Question

I have some python code that binds to a socket. I catch any exception so that I can handle it. Depending on the error, I want to do different things. How do I know what an error number means?

For example, I want to do something like:

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
   s.bind(('', 80))
except socket.error, ex
   (error_number, error_message) = ex
   if error_number==EADDRINUSE:
      print "You can't bind to that port -- someone else is using it"
   else:
      print "Unknown socket error"

except that I don't know what error number corresponds to EADDRINUSE. On my Ubuntu box it is 98, on a Mac running OS X 10.5 it is 48, and on a Windows XP box it is 10048. Is there some place where these are included in a python library?

I realize that the numbers are different because of differences in errno.h in the C layer, but I do not know where they are exposed in python. Similarly, I assume that I can't rely on the error message being a specific string.

Also, I'm not just concerned about EADDRINUSE -- I'd like to cover other errors, too.

Wooble · Accepted Answer · 2011-04-14 18:24:00Z

2

These errors are all defined in the errno module in the standard library.

answered Apr 14, 2011 at 18:24

Wooble

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