I've been trying to parse xml string using python, codes following:

    #-*- coding: utf-8 -*-
    import xml.etree.ElementTree as xmlet
    s = '<?xml version="1.0" encoding="GBK"?><info></info>'
    xmlet.fromstring(s)

Then:
    $ python2.6 test.py
or:
    $ pypy test.py

Traceback message came out like this:

    Traceback (most recent call last):
      File "test.py", line 4, in <module>
        xmlet.fromstring(s)
      File "/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/xml/etree/ElementTree.py", line 963, in XML
        parser.feed(text)
      File "/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/xml/etree/ElementTree.py", line 1245, in feed
        self._parser.Parse(data, 0)
    xml.parsers.expat.ExpatError: unknown encoding: line 1, column 30

I've seen this in following cases:

    Python2.5.6 on Mac OS X Lion
    Python2.6.5 on Ubuntu 10.04
    pypy1.7.0 on Mac OS X Lion

But not in these cases:

    Python2.6.7 on Mac OS X Lion
    Python2.7.1 on Mac OS X Lion