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Venv is great for keeping dependencies separate but if your local machine doesn’t have the same version of Python as your server then you’ll need pyenv.

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Not necessarily, you can use a CI pipeline to verify that your project can be build with many Python versions. This is the workflow I use here[0]. It makes catching and fixing breaking changes easier. Plus, I'm confident the core team is not likely to introduce a painful breaking change (think Python 2 -> 3) soon[1]

0: https://github.com/rmpr/atbswp

1: https://mobile.twitter.com/gvanrossum/status/130608247244308...

That's great for libraries but isn't it a pretty huge cost for an app you only really are going to be running on one version at a time?

Dealing with BC breaks for versions you aren't intending to run in production seems like unnecessary overhead.

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