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Hello !
while parsing a HTML code i got an decode Error :
but this issue can be fixed by replacing the last string by s.decode() like in
the diff file.
I also tried to execute my script under python3.2 and it does not parsing any thing 
 File "/usr/lib/python2.7/HTMLParser.py", line 111, in feed
 self.goahead(0)
 File "/usr/lib/python2.7/HTMLParser.py", line 155, in goahead
 k = self.parse_starttag(i)
 File "/usr/lib/python2.7/HTMLParser.py", line 260, in parse_starttag
 attrvalue = self.unescape(attrvalue)
 File "/usr/lib/python2.7/HTMLParser.py", line 410, in unescape
 return re.sub(r"&(#?[xX]?(?:[0-9a-fA-F]+|\w{1,8}));", replaceEntities, s)
 File "/usr/lib/python2.7/re.py", line 151, in sub
 return _compile(pattern, flags).sub(repl, string, count)
UnicodeDecodeError: 'ascii' codec can't decode byte 0x97 in position 1: ordinal
not in range(128)

Can you provide a minimal example to reproduce this error?
On Python 2 it's always better to decode the HTML first and then pass unicode to the parser. Even though on Python 2 the parser accepts bytes string too, there are a few corner cases where it fails.
On Python 3 the parser only accepts unicode, and it should work fine with it (especially if you have an updated clone of cpython). Can you show what failure you get with Python 3? Also, can you reproduce the error if you use strict=False?

See also #3932.

So we cant make decode by default ? !
Concerning python 3, it seems that it's not reading tags and attributes, i didn't get any error, but i don't have any result 
the example i used is there : http://docs.python.org/library/htmlparser.html#module-HTMLParser 
Of course, I replaced HTMLParser by html.parser

I don't think the patch can be applied as is -- in order to work s should be an ascii-only str. I will look at this again as soon as I have some time and see if something can be done.
FTR the Python 3 doc for html.parser can be found here: http://docs.python.org/py3k/library/html.parser.html#example-html-parser-application 

thank you for giving me a little of your time !
Yes that's what i've tested, i used the html.parser module and and I have no result!

I test this again and indeed a bare s.decode() is not enough to fix the problem. The attribute might contain non-ascii characters, and that will result in an error (see for example the "test.py" script attached to #3932). The correct solution is to decode the page before passing it to the parser.