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Merged
merged 56 commits into from
Jun 29, 2024
Merged

gh-120713: normalize year with century for datetime.strftime #120820

merged 56 commits into from
Jun 29, 2024

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blhsing
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@blhsing blhsing commented Jun 21, 2024 •
edited by jaraco
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On some platforms such as Linux, datetime.strftime does not 0-pad a year <= 999 when formatting with '%Y' despite the documentation claiming an example output of "0001, 0002, …". The same issue applies when formatting with "%G".

This PR fixes the issue by formatting a year with century with '%04ld' using sprintf (in C) or '{:04}' using str.format (in Python) if the platform is found to show the aforementioned behavior.

@bedevere-app bedevere-app bot mentioned this pull request Jun 21, 2024
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blurb-it bot and others added 14 commits June 21, 2024 06:37
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📜🤖 Added by blurb_it.
a1592e3
@blhsing
pythongh-120713: fixed pyconfig.h.in
48affbd
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Update 2024-06-21-06-37-46.gh-issue-120713.WBbQx4.rst
2ff6c0b
@blhsing
Update datetimetester.py
ab39dd9 
reverted unit test
@blhsing
Update datetimetester.py
b905a4e
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Update _pydatetime.py
b43858e
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pythongh-120713: format "%Y" with "%4d" using sprintf instead of repl…
6ca887e 
…acing the specifier with "%4Y"
@blhsing
pythongh-120713: test that a 0-padded year with century is guaranteed
a9623c4
@blhsing
pythongh-120713: revised detection logics in Python
2fc1c6a
@blhsing
pythongh-120713: fixed test
2c3252f
@blhsing
pythongh-120713: use "%04ld" instead of "%04d" to avoid unnecessary i…
9fd3d2d 
…nt conversion
@blhsing
pythongh-120713: fixed scope for formatted year buffer
e64780b
@blhsing
pythongh-120713: added #ifdef guard over formatted year buffer declar…
32026be 
…ation
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pythongh-120713: fixed typo
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serhiy-storchaka
serhiy-storchaka reviewed Jun 24, 2024
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Note that %G also needs a fix.

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blhsing commented Jun 25, 2024 •
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Note that %G also needs a fix.

Right. It's now accounted for. The calculation of ISO-8601 year for '%G' isn't straightforward so I'm obtaining it from the C strftime instead.

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serhiy-storchaka reviewed Jun 25, 2024
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Thank you for addressing my comments.

I think that this is the right way to fix this problem, but we should still get confirmation from other core developers.

The code is much more complicated now with the support of "%G", and the C code has some bugs.

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blhsing commented Jun 29, 2024

Thanks for enduring my nitpicking, and thanks for the PR :)

Thank you so much for taking the time to point me in the right direction!

@serhiy-storchaka serhiy-storchaka merged commit 6d34938 into python:main Jun 29, 2024
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Thanks @blhsing for the PR, and @serhiy-storchaka for merging it 🌮🎉.. I'm working now to backport this PR to: 3.12, 3.13.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Jun 29, 2024
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pythongh-120713: Normalize year with century for datetime.strftime (p…
c697743 
…ythonGH-120820)

(cherry picked from commit 6d34938)

Co-authored-by: blhsing <[email protected]>
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Sorry, @blhsing and @serhiy-storchaka, I could not cleanly backport this to 3.12 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 6d34938dc8163f4a4bcc68069a1645a7ab76e935 3.12

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bedevere-app bot commented Jun 29, 2024

GH-121144 is a backport of this pull request to the 3.13 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.13 bugs and security fixes label Jun 29, 2024
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Thank you for your work and patience @blhsing. My apologies for our too picky reviews.

serhiy-storchaka pushed a commit to serhiy-storchaka/cpython that referenced this pull request Jun 29, 2024
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[3.12] pythongh-120713: Normalize year with century for datetime.strf…
fe1645c 
…time (pythonGH-120820)

(cherry picked from commit 6d34938)

Co-authored-by: blhsing <[email protected]>
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bedevere-app bot commented Jun 29, 2024

GH-121145 is a backport of this pull request to the 3.12 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.12 only security fixes label Jun 29, 2024
serhiy-storchaka added a commit that referenced this pull request Jun 29, 2024
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[3.12] gh-120713: Normalize year with century for datetime.strftime (G…
027902b 
…H-120820) (GH-121145)

(cherry picked from commit 6d34938)

Co-authored-by: blhsing <[email protected]>
serhiy-storchaka pushed a commit that referenced this pull request Jun 29, 2024
@miss-islington @blhsing
[3.13] gh-120713: Normalize year with century for datetime.strftime (G…
009618f 
…H-120820) (GH-121144)

(cherry picked from commit 6d34938)

Co-authored-by: blhsing <[email protected]>
mrahtz pushed a commit to mrahtz/cpython that referenced this pull request Jun 30, 2024
@blhsing @mrahtz
pythongh-120713: Normalize year with century for datetime.strftime (p…
ae09fa4 
…ythonGH-120820)
noahbkim pushed a commit to hudson-trading/cpython that referenced this pull request Jul 11, 2024
@blhsing @noahbkim
pythongh-120713: Normalize year with century for datetime.strftime (p…
708fb11 
…ythonGH-120820)
@blhsing blhsing mentioned this pull request Jul 15, 2024
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estyxx pushed a commit to estyxx/cpython that referenced this pull request Jul 17, 2024
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pythongh-120713: Normalize year with century for datetime.strftime (p…
a7773c9 
…ythonGH-120820)
serhiy-storchaka added a commit to serhiy-storchaka/cpython that referenced this pull request Jul 29, 2024
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Revert "[3.13] pythongh-120713: Normalize year with century for datet…
a705c85 
…ime.strftime (pythonGH-120820) (pythonGH-121144)"

This reverts commit 009618f.
serhiy-storchaka added a commit to serhiy-storchaka/cpython that referenced this pull request Jul 29, 2024
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Revert "[3.12] pythongh-120713: Normalize year with century for datet…
533fc42 
…ime.strftime (pythonGH-120820) (pythonGH-121145)"

This reverts commit 027902b.
serhiy-storchaka added a commit that referenced this pull request Jul 29, 2024
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Revert "[3.12] gh-120713: Normalize year with century for datetime.st…
e6878fc 
…rftime (GH-120820) (GH-121145)" (GH-122409)

This reverts commit 027902b.
serhiy-storchaka added a commit that referenced this pull request Jul 29, 2024
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Revert "[3.13] gh-120713: Normalize year with century for datetime.st…
9f6f879 
…rftime (GH-120820) (GH-121144)" (GH-122408)

This reverts commit 009618f.
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⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Ubuntu NoGIL Refleaks 3.13 has failed when building commit 9f6f879.

What do you need to do:

  1. Don't panic.
  2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
  3. Go to the page of the buildbot that failed (https://buildbot.python.org/#builders/1431/builds/335) and take a look at the build logs.
  4. Check if the failure is related to this commit (9f6f879) or if it is a false positive.
  5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#builders/1431/builds/335

Failed tests:

  • test_pickle

Test leaking resources:

  • test_pickle: memory blocks
  • test_pickle: references

Summary of the results of the build (if available):

==

Click to see traceback logs 
remote: Enumerating objects: 10, done.        
remote: Counting objects:  10% (1/10)        
remote: Counting objects:  20% (2/10)        
remote: Counting objects:  30% (3/10)        
remote: Counting objects:  40% (4/10)        
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remote: Counting objects:  60% (6/10)        
remote: Counting objects:  70% (7/10)        
remote: Counting objects:  80% (8/10)        
remote: Counting objects:  90% (9/10)        
remote: Counting objects: 100% (10/10)        
remote: Counting objects: 100% (10/10), done.        
remote: Compressing objects:  12% (1/8)        
remote: Compressing objects:  25% (2/8)        
remote: Compressing objects:  37% (3/8)        
remote: Compressing objects:  50% (4/8)        
remote: Compressing objects:  62% (5/8)        
remote: Compressing objects:  75% (6/8)        
remote: Compressing objects:  87% (7/8)        
remote: Compressing objects: 100% (8/8)        
remote: Compressing objects: 100% (8/8), done.        
remote: Total 10 (delta 2), reused 5 (delta 2), pack-reused 0        
From https://github.com/python/cpython
 * branch                  3.13       -> FETCH_HEAD
Note: switching to '9f6f8790ef39fd035f6ada1a9dfcb47d58d08fea'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 9f6f8790ef Revert "[3.13] gh-120713: Normalize year with century for datetime.strftime (GH-120820) (GH-121144)" (GH-122408)
Switched to and reset branch '3.13'

configure: WARNING: no system libmpdecimal found; falling back to bundled libmpdecimal (deprecated and scheduled for removal in Python 3.15)

make: *** [Makefile:2264: buildbottest] Error 2

@serhiy-storchaka serhiy-storchaka mentioned this pull request Oct 17, 2024
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