[issue9811] strftime strips '%' from unknown format codes on OS X

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset b1873d1e24ed5ef39f37ca3090c2f0c2b34ce23f by Pablo Galindo (Miss 
Islington (bot)) in branch '3.10':
bpo-9811: [doc] strftime handling of unsupported format specifiers is platform 
dependent (GH-28264) (GH-28277)
https://github.com/python/cpython/commit/b1873d1e24ed5ef39f37ca3090c2f0c2b34ce23f


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[issue9811] strftime strips '%' from unknown format codes on OS X

[Irit Katriel]

Irit Katriel  added the comment:

No, I think we're good. Thanks.

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Łukasz Langa]

Łukasz Langa  added the comment:

Is there anything else you wanted to do here, Irit?

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Łukasz Langa]

Change by Łukasz Langa :


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status: open -> closed

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset baeaaecb8a97033bc2d07d51442cc8b1f89d410d by Miss Islington (bot) 
in branch '3.9':
bpo-9811: [doc] strftime handling of unsupported format specifiers is platform 
dependent (GH-28264) (GH-28278)
https://github.com/python/cpython/commit/baeaaecb8a97033bc2d07d51442cc8b1f89d410d


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[issue9811] strftime strips '%' from unknown format codes on OS X

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset 897e5aae748180acf8d546d14aeacaf02600fff9 by Miss Islington (bot) 
in branch '3.10':
bpo-9811: [doc] strftime handling of unsupported format specifiers is platform 
dependent (GH-28264) (GH-28277)
https://github.com/python/cpython/commit/897e5aae748180acf8d546d14aeacaf02600fff9


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[issue9811] strftime strips '%' from unknown format codes on OS X

[miss-islington]

Change by miss-islington :


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nosy: +miss-islington
nosy_count: 10.0 -> 11.0
pull_requests: +26695
pull_request: https://github.com/python/cpython/pull/28277

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset e86bcfa58080f152f242c756f625f4015671f168 by Irit Katriel in 
branch 'main':
bpo-9811: [doc] strftime handling of unsupported format specifiers is platform 
dependent (GH-28264)
https://github.com/python/cpython/commit/e86bcfa58080f152f242c756f625f4015671f168


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[issue9811] strftime strips '%' from unknown format codes on OS X

[miss-islington]

Change by miss-islington :


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pull_request: https://github.com/python/cpython/pull/28278

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Irit Katriel]

Change by Irit Katriel :


--
versions: +Python 3.10, Python 3.11, Python 3.9 -Python 2.7, Python 3.1, Python 
3.2

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Irit Katriel]

Irit Katriel  added the comment:

This issue was created 11 years ago today. Let's celebrate its anniversary by 
resolving it!

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Irit Katriel]

Change by Irit Katriel :


--
keywords: +patch
nosy: +iritkatriel
nosy_count: 8.0 -> 9.0
pull_requests: +26684
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/28264

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Marc-Andre Lemburg]

Marc-Andre Lemburg m...@egenix.com added the comment:

Santoso Wijaya wrote:
 
 Santoso Wijaya santoso.wij...@gmail.com added the comment:
 
 `strftime` does not, indeed, seem to define what behaviour it is supposed to 
 do when given non-supported format characters. Under Windows, in fact, it 
 will crash the runtime (see: issue #10762).

According to POSIX, it is defined to be undefined:


   If a conversion specification does not correspond to any of  the  above, 
 the
   behavior is undefined.


Of course, crashing the runtime is not a good way to interpret this ;-)

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Santoso Wijaya]

Santoso Wijaya santoso.wij...@gmail.com added the comment:

Yeah, I meant undefined. I looked that up when writing a patch for issue #10762.

Correction: It *used to* crash on Windows, before the patch was applied.

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Ronald Oussoren]

Ronald Oussoren ronaldousso...@mac.com added the comment:

I've filed #9451707 about this in Apple's bug tracker.

BTW. I don't think this is a platform bug, neither the manpage nor the unix 
specification at 
http://pubs.opengroup.org/onlinepubs/007908799/xsh/strftime.html specify what 
happens when you use an undocumented format specifier.

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[issue9811] strftime strips '%' from unknown format codes on OS X

[R. David Murray]

R. David Murray rdmur...@bitdance.com added the comment:

Right, that's why I said if it is a bug :)

FreeBSD has the same behavior, so I'd actually prefer that Apple not fix 
this.  It would be nice if FreeBSD did and Apple adopted it, though, since only 
dropping the % is the least intuitive approach to handling unknown codes I can 
think of.  Is Apple tracking FreeBSD development at all these days, or are they 
a true fork now?

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Ronald Oussoren]

Ronald Oussoren ronaldousso...@mac.com added the comment:

I'm not sure if Apple's tracking FreeBSD, but they at the very least heavily 
borrow code (see http://opensource.apple.com/source/Libc/Libc-594.9.4/ for 
libc)

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Santoso Wijaya]

Santoso Wijaya santoso.wij...@gmail.com added the comment:

`strftime` does not, indeed, seem to define what behaviour it is supposed to do 
when given non-supported format characters. Under Windows, in fact, it will 
crash the runtime (see: issue #10762).

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Éric Araujo]

Éric Araujo mer...@netwok.org added the comment:

I think supporting different specifiers is one thing, dropping the % character 
is another.  This is how I understand the bug report.

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[issue9811] strftime strips '%' from unknown format codes on OS X

[R. David Murray]

R. David Murray rdmur...@bitdance.com added the comment:

But if it is a bug, it is a bug in OS/X, not in Python.  Python could 
potentially fix it for python programs by providing our own strftime, but until 
someone does that the best we can do is a doc mention of this platform quirk.

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Éric Araujo]

Éric Araujo mer...@netwok.org added the comment:

Ah, I understand your first reply now.  Thanks.  Agreed on all your points.

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Sverre Johansen]

New submission from Sverre Johansen sverre.johan...@gmail.com:

There seems to be a platform difference in the way stftime handles 
unknown format codes.

In OSX Python removes the percentage sign from the returned string when the 
format code is unknown. In Linux it leaves it.

Look at the following example:

This is Python 3.1.2 in Ubuntu:

Python 3.1.2 (r312:79147, Apr 15 2010, 15:35:48) 
[GCC 4.4.3] on linux2
Type help, copyright, credits or license for more information.
 import datetime
 datetime.datetime.now().strftime(%q)
'%q'

And this is Python 3.1.2 on Max OSX:

Python 3.1.2 (r312:79147, Sep  9 2010, 11:11:24) 
[GCC 4.2.1 (Apple Inc. build 5664)] on darwin
Type help, copyright, credits or license for more information.
 import datetime
 datetime.datetime.now().strftime(%q)
'q'

I've gotten the same result in 2.5, 2.6 and 3.1.

FYI, this broke some code that parsed the same string first with strftime, and 
then used string interpolation (The mac version
deleted all percentage signs before '('):

 datetime.datetime.now().strftime(%Y - %(foobar)s) % {foobar: egg}

This does not work in OSX.

--
components: Library (Lib)
messages: 115933
nosy: sverrejoh
priority: normal
severity: normal
status: open
title: strftime strips '%' from unknown format codes on OS X
type: behavior
versions: Python 3.1

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Sverre Johansen]

Sverre Johansen sverre.johan...@gmail.com added the comment:

This is because of differences in GNU and BSD C stdlib; I get the same results 
using the BSD and GNU versions of `date`.

$ date +%q

What does Python typically do in cases like this?

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[issue9811] strftime strips '%' from unknown format codes on OS X

[R. David Murray]

R. David Murray rdmur...@bitdance.com added the comment:

Python's strftime is a thin wrapper around the system strftime.  This means, 
for example, that a slightly different set of % codes is supported on windows 
vs linux.  So, from Python's point of view this is at *most* a doc bug.

That said, I think there have been some rumblings about writing our own 
strftime, but I don't know if anyone is serious about it.

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assignee:  - d...@python
components: +Documentation -Library (Lib)
nosy: +belopolsky, d...@python, r.david.murray
versions: +Python 2.7, Python 3.2

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[issue9811] strftime strips '%' from unknown format codes on OS X

[Alexander Belopolsky]

Alexander Belopolsky belopol...@users.sourceforge.net added the comment:

 I think there have been some rumblings about writing our own strftime

Yes, see issue #3173.

Another related issue is #9650 which discusses how to properly document 
strftime codes.

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