I get the following result:
# emerge -pv1 olefile

These are the packages that would be merged, in order:
Calculating dependencies... done!
[ebuild   R    ] dev-python/olefile-0.46::gentoo  USE="-doc"
PYTHON_TARGETS="python2_7 python3_6 (-pypy3) (-python3_7*) (-python3_8)" 0
KiB
Total: 1 package (1 reinstall), Size of downloads: 0 KiB

It seems to be in line with the interpretation I've come up with.

Best regards
Mickaël Bucas

Le mar. 7 janv. 2020 à 16:18, Franz Fellner <alpine.art...@gmail.com> a
écrit :

> And what if you change the line to "dev-python/olefile amd64"?
>
> Am Di., 7. Jan. 2020 um 17:10 Uhr schrieb Mickaël Bucas <mbu...@gmail.com
> >:
>
>> Hi Franz
>>
>> Thanks for your reply.
>>
>> However your assumption is incorrect: these two commands are run on the
>> same machine, with only the keyword on "olefile" changed.
>> Thinking a bit more about it, Python 3.7 isn't stable yet, so I also have
>> "=dev-lang/python-3.7* ~amd64" in package.accept_keyword.
>>
>> I've been able to reproduce this behavior in a chroot based on stage 3
>> with the minimum packages installed.
>> I have in make.conf
>> PYTHON_TARGETS="python2_7 python3_6 python3_7"
>> In /var/lib/portage/world
>> dev-lang/python:3.7
>> dev-python/olefile
>> In /etc/portage/package.accept_keywords
>> dev-python/olefile ~amd64
>> =dev-lang/python-3.7* ~amd64
>> dev-python/setuptools ~amd64
>> dev-python/certifi ~amd64
>>
>> And emerge says :
>> # emerge -pv1 olefile
>> These are the packages that would be merged, in order:
>> Calculating dependencies... done!
>> [ebuild   R    ] dev-python/olefile-0.46::gentoo  USE="-doc"
>> PYTHON_TARGETS="python2_7 python3_6 python3_7 -pypy3 -python3_8" 0 KiB
>> Total: 1 package (1 reinstall), Size of downloads: 0 KiB
>>
>> When I remove " dev-python/olefile ~amd64", Python 3.7 would be disabled :
>> # emerge -pv1 olefile
>> These are the packages that would be merged, in order:
>> Calculating dependencies... done!
>> [ebuild   R    ] dev-python/olefile-0.46::gentoo  USE="-doc"
>> PYTHON_TARGETS="python2_7 python3_6 (-pypy3) (-python3_7*) (-python3_8)" 0
>> KiB
>> Total: 1 package (1 reinstall), Size of downloads: 0 KiB
>>
>> This is still puzzling me, but one interpretation may be :
>> I you enable the unstable ~amd64 keyword on a package, the stable version
>> of said package is allowed to run on the unstable version of the Python
>> interpreter.
>>
>> This seems to be the intended behavior, as I found that at least 40
>> Python packages on each of my 2 systems are stable and have Python 3.7
>> enabled (I keyworded all of them sometime in the past...)
>>
>> Thanks
>> Best regards
>> Mickaël Bucas
>>
>> Le mar. 7 janv. 2020 à 08:08, Franz Fellner <alpine.art...@gmail.com> a
>> écrit :
>>
>>> I assume those emerge commands weren't done on one machine but come from
>>> those two different machines.
>>> This change in USE Flags can't come from that line in
>>> package.accept_keywords.
>>> This is a change in PYTHON_TARGETS in make.conf, package.use or
>>> package.env.
>>> Carefully go through those config files/directories, I am sure you will
>>> find the offending line.
>>>
>>> Regards
>>> Franz
>>>
>>> Am Fr., 3. Jan. 2020 um 11:44 Uhr schrieb Mickaël Bucas <
>>> mbu...@gmail.com>:
>>>
>>>> Hello
>>>>
>>>> For some time I've been wondering why I had a difference on
>>>> dev-python/olefile-0.46 between 2 machines : one was installed with
>>>> python_targets_python3_7, the other wasn't.
>>>> And I finally pinpointed it to package.accept_keywords containing
>>>> "dev-python/olefile ~amd64" on one of the machines only
>>>>
>>>> At the time of writing, dev-python/olefile-0.46 is the stable version,
>>>> and KEYWORDS contains "amd64" (no tilde) among others.
>>>>
>>>> When package.accept_keywords doesn't contain "dev-python/olefile
>>>> ~amd64", I get :
>>>>     emerge -pv1 --verbose-conflicts olefile
>>>>     These are the packages that would be merged, in order:
>>>>     Calculating dependencies... done!
>>>>     [ebuild   R    ] dev-python/olefile-0.46::gentoo  USE="-doc"
>>>> PYTHON_TARGETS="python2_7 python3_6 (-pypy3) (-python3_7) (-python3_8)" 0
>>>> KiB
>>>>     Total: 1 package (1 reinstall), Size of downloads: 0 KiB
>>>>
>>>> => Python 3.7 is disabled
>>>>
>>>> When package.accept_keywords contains "dev-python/olefile ~amd64", I
>>>> get :
>>>>     emerge -pv1 olefile
>>>>     These are the packages that would be merged, in order:
>>>>     Calculating dependencies... done!
>>>>     [ebuild   R    ] dev-python/olefile-0.46::gentoo  USE="-doc"
>>>> PYTHON_TARGETS="python2_7 python3_6 python3_7* -pypy3 -python3_8" 0 KiB
>>>>     Total: 1 package (1 reinstall), Size of downloads: 0 KiB
>>>>
>>>> => Python 3.7 is enabled
>>>>
>>>> It seems really really strange to me for the same version of a stable
>>>> package to be "influenced" by keywording.
>>>> Is it a bug or a feature ?
>>>> Did I do something wrong ?
>>>>
>>>> Thanks
>>>> Best regards
>>>> Mickaël Bucas
>>>>
>>>

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