[issue2551269] Document python2 support plan

New submission from John Rouillard:

Figure out a plan for EOLing python2 support.

Document and publish.

I figure we have at least 3 more years before we stop supporting python2.

New features if they can be supported with both python2 and 3 easily
should be. But I have no objection to adding features that only work on python3
and return not implemented if used on python2.

Will need to figure out how to mark these python3 only features in documentation.

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components: Documentation
messages: 7741
nosy: rouilj
severity: normal
status: new
title: Document python2 support plan
type: behavior

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