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Hm not exactly what I tried to convey. I guess I would love if python stopped trying to add new syntax so often.

Walrus operator, fstring, etc. should happen maybe once every two years ideally? Did we really need the walrus operator? The cost of adding it is making any library using it in python 3.8+ incompatible with runtimes of python3.8<.

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In the ideal world, library developers would properly use the python_requires[1] option and dependency resolvers would correctly identify the latest version of a library that works with the installed version of Python. Unfortunately I have found that is not always the case.

When I make public modules, I personally weigh whether using a new feature is worth losing users stuck on an older version. That sweet spot for me right now is targeting Python 3.6 and using backported modules where necessary (e.g. mypy-extensions). I'm a big type hint fan and type hinting became much more usable in >= 3.6.

[1] https://packaging.python.org/guides/distributing-packages-us...

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