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[Python-Dev] Confused on git commit tree about Lib/datetime.py

FWIW, it looks like this is the first (earliest) merge commit that
caused the v2.7.4 line to contain

    $ git show -q d26b658f1433a28b611906c078f47bc804a63dd1
    commit d26b658f1433a28b611906c078f47bc804a63dd1
    Merge: 2d639d5665 f8b9dfd9a1
    Author: Georg Brandl <georg at python.org>
    Date:   Sat Aug 11 11:08:04 2012 +0200

        Graft a89d654adaa2 from 3.2 branch. Fixes #15620.


On Tue, Jul 31, 2018 at 11:53 PM, Chris Angelico <rosuav at gmail.com> wrote:
> On Wed, Aug 1, 2018 at 1:16 PM, Jeffrey Zhang <zhang.lei.fly at gmail.com> wrote:
>> I found a interesting issue when checking the Lib/datetime.py implementation
>> in python3
>> This patch is introduced by cf86e368ebd17e10f68306ebad314eea31daaa1e [0].
>> But if you
>> check the github page[0], or using git tag --contains, you will find v2.7.x
>> includes this commit too.
>> $ git tag --contains cf86e368ebd17e10f68306ebad314eea31daaa1e
>> 3.2
>> v2.7.10
>> v2.7.10rc1
>> v2.7.11
>> v2.7.11rc1
>> ...
>> whereas, if you check the v2.7.x code base, nothing is found
>> $ git log v2.7.4 -- Lib/datetime.py
>> <nothing here>
>> I guess it maybe a git tool bug, or the commit tree is messed up. Is there
>> any guys could explain this
>> situation?
> I suppose you could say that the commit tree is "messed up", in a
> sense, but it's not truly messed up, just a little odd. It's a
> consequence of the way merges have been done in the CPython
> repository. Nothing is actually broken, except for the ability to
> track down a commit the way you're doing.
> ChrisA
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