[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Yes please.

I have one exception. I f we manage to get the new parser (pegen) in, we have to remove the old parser module.

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nosy: +gvanrossum

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<https://bugs.python.org/issue39674>
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