Confused on git commit tree about Lib/datetime.py

[Jeffrey Zhang]

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?

[0]
https://github.com/python/cpython/commit/cf86e368ebd17e10f68306ebad314eea31daaa1e

-- 
Regards,
Jeffrey Zhang
Blog: http://xcodest.me