Hi, everyone.

I think we've reached the point where we should start discussing
switching the defaults to Python 3.6.  I would like to gather your
opinion the following ideas.

Firstly, I'd like to do two changes simultaneously to reduce --newuse
rebuilds:

a. switching from CPython 3.5 to 3.6,

b. disabling CPython 3.4.

I'm thinking of a soft deadline on 2018-06-01, i.e. giving developers
a full month to prepare.  If things don't go well, we can always
postpone it.

According to my lists, we only have 6 packages relying on py3.4 right
now [1] and no pending stabilizations for that.  I will report bugs for
those packages today.

The list for 3.5->3.6 migration is longer [2].  However, it seems that
many of those packages are rather isolated [3] and apparently
unmaintained.  Apparently the biggest targets are OpenStack
and Flask.  It's all doable.

What do you think?

[1]:https://qa-reports.gentoo.org/output/gpyutils/34-to-35.txt
[2]:https://qa-reports.gentoo.org/output/gpyutils/35-to-36.txt
[3]:https://qa-reports.gentoo.org/output/gpyutils/35-to-36.svg

-- 
Best regards,
Michał Górny


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