TIL: Single source version package builds with uv

Tired of updating the version in multiple places before publishing a package update? Leery of using inspect.metadata to fetch the package? Here's how to have a single source of version using UV's build subcommand.

2025-07-23T01:59:20.353392

Remove version in pyproject.toml and replace with dynamic = ["version"]
Add [tool.setuptools.dynamic] and specify the location of the version using this dialogue: version = { attr = "mypackage.__version__" }
In your project's root __init__.py, add a __version__ attribute.

Example:

# pyproject.toml
[project]
name = "mypackage"
dynamic = ["version"]
# version = "0.1.0" # Don't set version here

[tool.setuptools.dynamic]
version = { attr = "mypackage.__version__" } # Set version here

Don't forget to specify the version in Python:

# mypackage/__init__.py
__version__ = "0.1.0"

Thanks to Audrey Roy Greenfeld for pairing with me on getting this to work.

Tags: TIL python

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