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Hopefully it will not be a repeat of Python 2 to 3 migration. I hope Python community can find an intelligent utility which can automatically convert deprecated calls to new format transparently.

Personally I had issues with pycrypto module when upgraded one of my micro-service to use Python 3.8, it was frustrating experience. Hope it does not happen again with 3.9.

Guido already mentioned in his email not to do it [1], Python community suffered enough from 2 to 3 transition.

[1] https://mail.python.org/archives/list/python-dev@python.org/...