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narrow build incorrectly translates cases for non-BMP code points #51912

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exarkun mannequin opened this issue Jan 10, 2010 · 4 comments
Closed

narrow build incorrectly translates cases for non-BMP code points #51912

exarkun mannequin opened this issue Jan 10, 2010 · 4 comments
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interpreter-core (Objects, Python, Grammar, and Parser dirs) topic-unicode type-bug An unexpected behavior, bug, or error

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@exarkun
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Mannequin

exarkun mannequin commented Jan 10, 2010

BPO 7663
Nosy @malemburg, @loewis, @amauryfa, @ezio-melotti

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = <Date 2010-01-10.18:00:12.148>
created_at = <Date 2010-01-10.05:27:27.444>
labels = ['interpreter-core', 'type-bug', 'expert-unicode']
title = 'narrow build incorrectly translates cases for non-BMP code points'
updated_at = <Date 2010-11-27.23:31:48.173>
user = 'https://bugs.python.org/exarkun'

bugs.python.org fields:

activity = <Date 2010-11-27.23:31:48.173>
actor = 'ezio.melotti'
assignee = 'none'
closed = True
closed_date = <Date 2010-01-10.18:00:12.148>
closer = 'lemburg'
components = ['Interpreter Core', 'Unicode']
creation = <Date 2010-01-10.05:27:27.444>
creator = 'exarkun'
dependencies = []
files = []
hgrepos = []
issue_num = 7663
keywords = []
message_count = 4.0
messages = ['97500', '97501', '97529', '122569']
nosy_count = 6.0
nosy_names = ['lemburg', 'loewis', 'exarkun', 'amaury.forgeotdarc', 'Rhamphoryncus', 'ezio.melotti']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'test needed'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue7663'
versions = ['Python 2.7']
@exarkun
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exarkun mannequin commented Jan 10, 2010

This issue may extend beyond just unicode.upper() and unicode.lower(), but it's very clear with these two methods, at least.

For example, consider DESERET SMALL LETTER EW. On a UTF-16 build, calling upper on a string containing this doesn't change it to the capital variation (DESERET CAPITAL LETTER EW):

>>> u'\N{DESERET SMALL LETTER EW}'.upper() == u'\N{DESERET SMALL LETTER EW}'
True

It can also be seen that this isn't even recognized as lower case:

>>> u'\N{DESERET SMALL LETTER EW}'.islower()
False

With a UTF-32 build, however, the expected behavior (ie, the behavior one would get for a code point in the BMP with small and capital variations) is provided.

@exarkun exarkun mannequin added the interpreter-core (Objects, Python, Grammar, and Parser dirs) label Jan 10, 2010
@Rhamphoryncus
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Rhamphoryncus mannequin commented Jan 10, 2010

See also bpo-5127.

@ezio-melotti ezio-melotti added topic-unicode type-bug An unexpected behavior, bug, or error labels Jan 10, 2010
@malemburg
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This is a duplicate of http://bugs.python.org/issue5127

@malemburg malemburg changed the title UTF-16 build incorrectly translates cases for non-BMP code points UCS4 build incorrectly translates cases for non-BMP code points Jan 10, 2010
@ezio-melotti
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This is not yet fixed but will be addressed in bpo-10521 and bpo-10542.

@ezio-melotti ezio-melotti changed the title UCS4 build incorrectly translates cases for non-BMP code points narrow build incorrectly translates cases for non-BMP code points Nov 27, 2010
@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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