Include python-version in pyproject.toml

[tomaszbk]

Question

Wouldn't it be cleaner to include the python version to use in the pyproject.toml file, instead of creating a separate .python-version file?

Platform

No response

Version

No response

[my1e5]

See

• why is .python-version a mandatory file? #9494
• uv python pin should support writing to a uv.toml or pyproject.toml #4970
• Support reading Python versions from tool.uv  #4359

[Gankra]

This comment by Charlie I think summarizes the situation well:

The .python-version file is not quite obsolete with requires-python -- they're subtly different. requires-python is the range of versions supported by your project. .python-version is the exact version you want to use when developing. For example, if you're working on a library, your requires-python might be >= "3.10". But when developing on your machine, you might want to use 3.12.4 by default -- so you'd set that in a .python-version.

Since these two values are different, and pyproject one should ideally be looser, I think this continues to be something we don't plan to change.