Eryk Sun added the comment:
It duplicates translated characters as well. For example:
>>> table = str.maketrans('mnopqrb', 'rqponm\u0100', 'a')
>>> 'aaaaaamnopqrb'.translate(table)
'rqponmrqponmĀ'
3.4 returns the correct result:
>>> table = str.maketrans('mnopqrb', 'rqponm\u0100', 'a')
>>> 'aaaaaamnopqrb'.translate(table)
'rqponmĀ'
The problem is the new fast path for one-to-one ASCII mapping
(unicode_fast_translate in Objects/unicodeobject.c) doesn't have a way to
return the current input position in order to resume processing the
translation. _PyUnicode_TranslateCharmap assumes it's the same as the current
writer position, which is wrong when input characters have been deleted.
----------
nosy: +eryksun
title: str.translate() unexpectedly duplicates untranslated characters ->
str.translate() unexpectedly duplicates characters
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26464>
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