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Add docs for `.python-version` file discovery (#8898)

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Zanie Blue 2024-11-07 14:10:36 -06:00
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docs/concepts/python-versions.md
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@ -49,6 +49,17 @@ By default, uv will automatically download Python versions if they cannot be fou
This behavior can be
[disabled with the `python-downloads` option](#disabling-automatic-python-downloads).
### Python version files
The `.python-version` file can be used to create a default Python version request. uv searches for a
`.python-version` file in the working directory and each of its parents. Any of the request formats
described above can be used, though use of a version number is recommended for interopability with
other tools.
A `.python-version` file can be created in the current directory with the `uv python pin` command.
Discovery of `.python-version` files can be disabled with `--no-config`.
## Installing a Python version
uv bundles a list of downloadable CPython and PyPy distributions for macOS, Linux, and Windows.
@ -91,20 +102,17 @@ $ uv python install pypy
All of the [Python version request](#requesting-a-version) formats are supported except those that
are used for requesting local interpreters such as a file path.
By default `uv python install` will verify that a managed Python version is installed or install the
latest version. If a `.python-version` file is present, uv will install the Python version listed in
the file. A project that requires multiple Python versions may define a `.python-versions` file. If
present, uv will install all of the Python versions listed in the file.
## Project Python versions
By default `uv python install` will verify that a managed Python version is installed or install the
latest version.
However, a project may include a `.python-version` file specifying a default Python version. If
present, uv will install the Python version listed in the file.
Alternatively, a project that requires multiple Python versions may also define a `.python-versions`
file. If present, uv will install all of the Python versions listed in the file. This file takes
precedence over the `.python-version` file.
uv will also respect Python requirements defined in a `pyproject.toml` file during project command
invocations.
uv will respect Python requirements defined in `requires-python` in the `pyproject.toml` file during
project command invocations. The first Python version that is compatible with the requirement will
be used, unless a version is otherwise requested, e.g., via a `.python-version` file or the
`--python` flag.
## Viewing available Python versions