Support uvx python and uvx python@<version>

[zanieb]

To improve the experience of spawning an interactive REPL

Related

• Clarify that uv run python gets you a REPL #6548

[Aditya-PS-05]

@zanieb,
According to question -> support uvx python
Internally it will be work as uv run python.

Am I corrected? Is there something else?

[zanieb]

uvx python is an alias for uv tool run python which would create an isolated empty environment. uv run python will use existing environments if it can find it — it's a bit different in that sense.

[mikeleppane]

@zanieb If it's okay, I would be interested in taking a look at this 🕵‍♂️. If possible, could you give some hints on where to start with this?

[zanieb]

@mikeleppane sweet! Probably around

uv/crates/uv/src/commands/tool/run.rs

Line 96 in 4f23491

let target = Target::parse(target, from.as_deref());

I'm not sure what the best way to refactor it is. Maybe we want a new Target variant Python which we then special-case?

[zanieb]

Then we'd have to introduce more variants for python@latest and such though, so maybe we just want to special case the "python" name around

uv/crates/uv/src/commands/tool/run.rs

Lines 352 to 404 in 4f23491

	// Resolve the `--from` requirement.
	let from = match target {
	// Ex) `ruff`
	Target::Unspecified(name) => Requirement {
	name: PackageName::from_str(name)?,
	extras: vec![],
	marker: MarkerTree::default(),
	source: RequirementSource::Registry {
	specifier: VersionSpecifiers::empty(),
	index: None,
	},
	origin: None,
	},
	// Ex) `ruff@0.6.0`
	Target::Version(name, version) | Target::FromVersion(_, name, version) => Requirement {
	name: PackageName::from_str(name)?,
	extras: vec![],
	marker: MarkerTree::default(),
	source: RequirementSource::Registry {
	specifier: VersionSpecifiers::from(VersionSpecifier::equals_version(
	version.clone(),
	)),
	index: None,
	},
	origin: None,
	},
	// Ex) `ruff@latest`
	Target::Latest(name) | Target::FromLatest(_, name) => Requirement {
	name: PackageName::from_str(name)?,
	extras: vec![],
	marker: MarkerTree::default(),
	source: RequirementSource::Registry {
	specifier: VersionSpecifiers::empty(),
	index: None,
	},
	origin: None,
	},
	// Ex) `ruff>=0.6.0`
	Target::From(_, from) => resolve_names(
	vec![RequirementsSpecification::parse_package(from)?],
	&interpreter,
	settings,
	&state,
	connectivity,
	concurrency,
	native_tls,
	cache,
	printer,
	)
	.await?
	.pop()
	.unwrap(),
	};