[New-bugs-announce] [issue32437] UnicodeError: 'IDNA does not round-trip'

[Марк Коренберг]

New submission from Марк Коренберг <socketpair at gmail.com>:

First: This is the bug:

In [1]: 'großhandel-shop'.encode('idna')
Out[1]: b'grosshandel-shop'

This lead to this:

'xn--einla-pqa'.decode('idna')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.6/encodings/idna.py", line 214, in decode
    result.append(ToUnicode(label))
  File "/usr/lib/python3.6/encodings/idna.py", line 139, in ToUnicode
    raise UnicodeError("IDNA does not round-trip", label, label2)
UnicodeError: ('IDNA does not round-trip', b'xn--einla-pqa', b'einlass')


https://stackoverflow.com/questions/9806036/idna-does-not-round-trip


xn--grohandel-shop-2fb has been correctly encoded by IDNA 2008 (which is correct in Germany/DENIC since a while). Your Python very likely tries to decode it using the old IDNA 2003, which doesn't know 'ß'. see denic.de/en/know-how/idn-domains

----------
components: Unicode
messages: 309117
nosy: ezio.melotti, socketpair, vstinner
priority: normal
severity: normal
status: open
title: UnicodeError: 'IDNA does not round-trip'
type: behavior
versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32437>
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