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From: Mike Gilbert <floppym@gentoo.org>
Date: Mon, 23 Apr 2018 18:10:08 -0400
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Subject: Re: [gentoo-user] Re: Dependencies and PYTHON_TARGETS
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On Mon, Apr 23, 2018 at 3:15 PM, Neil Bothwick <neil@digimed.co.uk> wrote:
> On Mon, 23 Apr 2018 08:37:42 -0700, Ian Zimmerman wrote:
>
>> > > Why did portage remove my python-3.5?
>> >
>> > Because nothing that depends on it isn't also satisfied by
>> > python-3.6?
>>
>> But doesn't the PYTHON_TARGETS with which a package is built create a
>> strict dependency on those pythons?  If native code extensions are
>> present, the compiled code won't in general be compatible with other
>> versions.
>
> AIUI PYTHON_TARGETS determines which python version extension modules are
> installed for. If you don't set PYTHON_TARGETS explicitly, portage sets
> it according to the versions you have installed.
>

You are incorrect; PYTHON_TARGETS is never calculated based on the
versions of python you have installed.