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Fail codecs.lookup() on 'mbcs' and 'tactis' #42252

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liturgist mannequin opened this issue Aug 4, 2005 · 10 comments
Closed

Fail codecs.lookup() on 'mbcs' and 'tactis' #42252

liturgist mannequin opened this issue Aug 4, 2005 · 10 comments
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@malemburg
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docs Documentation in the Doc dir topic-unicode type-feature A feature request or enhancement

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@liturgist
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Mannequin

liturgist mannequin commented Aug 4, 2005

BPO 1251921
Nosy @malemburg, @loewis, @vstinner, @devdanzin

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 = 'https://github.com/malemburg'
closed_at = <Date 2009-02-16.20:02:29.380>
created_at = <Date 2005-08-04.14:11:16.000>
labels = ['type-feature', 'expert-unicode', 'docs']
title = "Fail codecs.lookup() on 'mbcs' and 'tactis'"
updated_at = <Date 2009-02-16.20:02:29.378>
user = 'https://bugs.python.org/liturgist'

bugs.python.org fields:

activity = <Date 2009-02-16.20:02:29.378>
actor = 'vstinner'
assignee = 'lemburg'
closed = True
closed_date = <Date 2009-02-16.20:02:29.380>
closer = 'vstinner'
components = ['Documentation', 'Unicode']
creation = <Date 2005-08-04.14:11:16.000>
creator = 'liturgist'
dependencies = []
files = []
hgrepos = []
issue_num = 1251921
keywords = []
message_count = 10.0
messages = ['25983', '25984', '25985', '25986', '25987', '25988', '25989', '25990', '82196', '82267']
nosy_count = 5.0
nosy_names = ['lemburg', 'loewis', 'liturgist', 'vstinner', 'ajaksu2']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue1251921'
versions = ['Python 2.4']
@liturgist
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liturgist mannequin commented Aug 4, 2005 

$ python
Python 2.4.1 (#1, May 16 2005, 15:19:29)
[GCC 4.0.0 20050512 (Red Hat 4.0.0-5)] on linux2
Type "help", "copyright", "credits" or "license" for
more information.
>>> import codecs
>>> codecs.lookup('ascii')
(<built-in function ascii_encode>, <built-in function
ascii_decode>, <class encodings.ascii.StreamReader at
0xb7f1302c>, <class encodings.ascii.StreamWriter at
0xb7f82fbc>)
>>> codecs.lookup('mbcs')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.4/encodings/__init__.py", line
96, in search_function
    globals(), locals(), _import_tail)
  File "/usr/lib/python2.4/encodings/mbcs.py", line 14,
in ?
    class Codec(codecs.Codec):
  File "/usr/lib/python2.4/encodings/mbcs.py", line 18,
in Codec
    encode = codecs.mbcs_encode
AttributeError: 'module' object has no attribute
'mbcs_encode'
>>> codecs.lookup('tactis')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
LookupError: unknown encoding: tactis

@liturgist liturgist mannequin assigned malemburg Aug 4, 2005
@liturgist liturgist mannequin added the topic-unicode label Aug 4, 2005
@liturgist liturgist mannequin assigned malemburg Aug 4, 2005
@liturgist liturgist mannequin added the topic-unicode label Aug 4, 2005
@malemburg
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user_id=38388

mbcs is only available on Windows.

I'm not sure what happened to the tactis codec - it's
possible that it never got checked in.

Do you have a reference for the tactis encoding ?

@liturgist
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liturgist mannequin commented Aug 4, 2005

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UTF-8 is an MBCS encoding in that is is a "multiple byte
character set", right? :-) UTF-16 is an MSCS; multiple
short character set.

There appears to have been some discussion on 'tactis' and
'tactis260' earlier in bug 854511.

http://mail.python.org/pipermail/python-bugs-list/2003-December/021394.html

@liturgist
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liturgist mannequin commented Aug 4, 2005

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If 'mbcs' is Windows-only, then why does it appear in the
list of registered codecs in encodings.aliases.aliases on
the Linux platform? Shouldn't it not be registered on other
platforms?

@loewis
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loewis mannequin commented Aug 6, 2005

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user_id=21627

Yes, UTF-8 is a multi-byte character set, but no, UTF-8 and
mbcs are not synonyms. See

http://docs.python.org/lib/standard-encodings.html

for the documentation. encodings.aliases.aliases is no
registration - it is an alias databse. So if somebody refers
to "dbcs", this will be aliased to "mbcs". That does not
mean "mbcs" needs to be supported - it only means "dbcs" is
not supported on Linux, either.

tactis was never part of a Python release, so its lack is
not a bug.

Closing this report as invalid.

@malemburg
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Reopened: this is indeed a bug - the tactis codec is
referenced in the aliases table but was never added to the
encodings package.

Either the codec will have to be added, or the alias entry
removed.

@liturgist
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liturgist mannequin commented Aug 6, 2005

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Where is bug 854511 regarding Thai encodings? The URL has
some discussion of this bug on TISI and ISO encodings.

http://mail.python.org/pipermail/python-bugs-list/2003-December/021394.html

@loewis
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loewis mannequin commented Aug 6, 2005

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It's not a bug, it's a feature request, and it's at

http://python.org/sf/854511

I have rejected the request.

@devdanzin
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devdanzin mannequin commented Feb 16, 2009

The 'tactis' codec is still missing, but it's not mentioned in docs
either: http://docs.python.org/dev/library/codecs.html#id3

I'll close this one soon unless someone voices disagreement.

@devdanzin devdanzin mannequin added docs Documentation in the Doc dir type-feature A feature request or enhancement labels Feb 16, 2009
@vstinner
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It looks like few people need this codec (no message since 2005), so I
close this feature request.

Reopen this issue if you need this codec.

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 9, 2022
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