in /usr/lib/python2.3/encodings/idna.py, line 175 it goes:
lables = input.split('.')
which causes the interpreter to stop executing the
program, but by changing it to
labels = dots.split(input)
everything's fine ;)

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Martin, it looks like line 174: unicode(input, "ascii")
should be input = unicode(input, "ascii").
I'm not sure what's supposed to happenning here, but it
looks like the if/else code block may be able to be
rewritten as:

if not isinstance(input, unicode):
    input = unicode(input, "ascii")
labels = dots.split(input)

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I can't see any problem in the code. The invocation of unicode() is 
correct - we just look for the exception that call may raise.

Rumpeltux, can you please report the exact input and exception you get?

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>>> unicode('xn--mller-kva.de', 'idna')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.3/encodings/idna.py", line 175, in
decode
    labels = input.split(".")
AttributeError: 'buffer' object has no attribute 'split'

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This is now fixed in idna.py 1.4 and 1.2.12.2, by converting input to a 
string object. I leave this open to find out why there is a buffer object in 
the first place.

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Found it. PyUnicode_FromEncodedObject converts the string object to 
char*/len, then calls PyUnicode_Decode. This special-cases UTF-8, Latin
-1 and ASCII, then creates a buffer object and passes it to 
PyCodec_Decode.

Even if it might be possible to pass the string directly to the codec, the 
codec still has to deal with buffer objects, for direct callers of 
PyUnicode_Decode. So I leave the fix as-is, added a test-case 
(test_codecs.py 1.10), and close this as fixed.