ValueError: I/O operation on closed file. with python3

[Adam Mercer]

Hi

I'm trying to update one of my scripts so that it runs under python2
and python3, but I'm running into an issue that the following example
illustrates:

$ cat test.py
try:
  # python-2.x
  from urllib2 import urlopen
  from ConfigParser import ConfigParser
except ImportError:
  # python-3.x
  from urllib.request import urlopen
  from configparser import ConfigParser

server='http://www.lsc-group.phys.uwm.edu/~ram/files'

fp = urlopen('%s/latest.ini' % server).fp
cp = ConfigParser()
cp.readfp(fp)
print(cp.get('version', '10.8'))
$

This works as expected when using python2:

$ python2.7 test.py
5.2.10
$

but when using python3 I receive the following error:

$ python3.3 test.py
Traceback (most recent call last):
  File "test.py", line 14, in <module>
    cp.readfp(fp)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/configparser.py",
line 753, in readfp
    self.read_file(fp, source=filename)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/configparser.py",
line 708, in read_file
    self._read(f, source)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/configparser.py",
line 1010, in _read
    for lineno, line in enumerate(fp, start=1):
ValueError: I/O operation on closed file.
$

Is there a way to get this working in both python2 and python3?

This is a small script and I'm starting to have some users wanting to
use python3 and others sticking to python2 so I'd like to accommodate
them both if possible.

Cheers

Adam