Lukasz, pleased consider seriously to move to a 3rd party package. Even
pgen2.

On Mon, Apr 23, 2018, 21:12 Benjamin Peterson <report@bugs.python.org>
wrote:

>
> Benjamin Peterson <benjamin@python.org> added the comment:
>
> The stdlib is a bad place for anything that needs to evolve at a
> non-glacial place. For example, even when 2to3 had not yet fallen out of
> favor, there were effectively 3 versions of it: one 2.7 and two in
> maintained 3.x branches. That was a large pain. 2to3 also could only be
> updated as quickly as Python is released.
>
> ----------
> stage: patch review ->
>
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> Python tracker <report@bugs.python.org>
> <https://bugs.python.org/issue33337>
> _______________________________________
>