Deduplicate marker-specific dependencies in `uv pip tree` output #16078

terror · 2025-09-30T18:59:52Z

Resolves #16067

When we build the dependency graph we add an edge per Requires-Dist. If a package publishes multiple marker-guarded requirements (like pylint’s dill>=… for different Python versions), more than one marker can evaluate to true at runtime, which gives us several edges pointing to the same installed package node.

To avoid printing the package multiple times, we gather all edges targeting that node, pass them through a Cursor, and aggregate their requirement details before we print the dependency line. That aggregation does two things:

If any edge carries a URL, we return that URL immediately.
Otherwise we merge all version specifiers into one canonical PEP 440 string.

I've added an integration test, namely cargo test -p uv --test it --features pypi -- no_duplicate_dependencies_with_markers exercises the new snapshot that installs pylint (with the real dill duplication scenario present in the original issue) and asserts the tree output, both with and without --show-version-specifiers, now shows a single dill entry with the merged constraint.

zanieb · 2025-09-30T19:48:51Z

Thanks for the pull request! Let me double check what we actually do at resolution-time, I'm not sure if we actually merge the specifiers as done here and I want to make sure we're doing the same thing.

crates/uv/tests/it/pip_tree.rs

zanieb · 2025-09-30T20:11:48Z

crates/uv/src/commands/pip/tree.rs

+        let (lower, upper, others) = specifiers.into_iter().fold(
+            (None, None, Vec::new()),
+            |(lower, upper, mut rest), spec| match *spec.operator() {
+                Operator::GreaterThan | Operator::GreaterThanEqual => {
+                    (Some(Self::prefer_lower(lower, spec)), upper, rest)
+                }
+                Operator::LessThan | Operator::LessThanEqual => {
+                    (lower, Some(Self::prefer_upper(upper, spec)), rest)
+                }
+                _ => {
+                    rest.push(spec);
+                    (lower, upper, rest)
+                }
+            },
+        );
+
+        let mut merged = lower
+            .into_iter()
+            .chain(upper)
+            .chain(others)
+            .collect::<Vec<_>>();
+
+        let mut seen = FxHashSet::default();
+
+        merged.retain(|spec| seen.insert(spec.to_string()));
+
+        VersionSpecifiers::from_iter(merged)


I'm a little wary of this. We almost certainly already have logic for combining version specifiers, though I'm not sure we can use it here, e.g.

uv/crates/uv-pep440/src/version_ranges.rs

Lines 13 to 22 in 3f83390

impl From<VersionSpecifiers> for Ranges<Version> {

/// Convert [`VersionSpecifiers`] to a PubGrub-compatible version range, using PEP 440

/// semantics.

fn from(specifiers: VersionSpecifiers) -> Self {

let mut range = Self::full();

for specifier in specifiers {

range = range.intersection(&Self::from(specifier));

}

range

}

It does look pretty clean though and is nicer than emitting redundant ranges, e.g., >=3.6, >=3.7.

@konstin might have some thoughts.

From what I understand, this is a lossy conversion, e.g. once we intersect the specifiers into intervals for PubGrub we lose the exact shape of the original constraints, and there isn’t a reliable way to turn an arbitrary range back into a finite set of PEP 440 specifiers.

We could instead move the specifier-level deduplication that tightens bounds into the PEP 440 crate, exposing it for other potential use-cases and decluttering the pip tree implementation. What do you think?

Yeah it makes sense that the PubGrub range would lose the original constraints.

I think I'll want to hear from @konsti, but either having it here until we have another use-case or moving it to the PEP 440 crate seems reasonable.

Ideally we'd be using Ranges<Version>, which gives us a canonical representation. The problem is that iirc we don't have a function yet for that conversion that handles prereleases correctly. There's another catch to this that while >=2.0.0 is technically larger than >=2.0.0a1, the latter allows prereleases while the former doesn't.

I wouldn't put too much effort into making simplifications on VersionSpecifiers work, Ranges is a much better representation to work with.

I think the amount of effort here for simplifying version specifiers seems pretty reasonable for user display if the only alternative is Ranges<Version>

Ideally we'd be using Ranges<Version>, which gives us a canonical representation. The problem is that iirc we don't have a function yet for that conversion that handles prereleases correctly. There's another catch to this that while >=2.0.0 is technically larger than >=2.0.0a1, the latter allows prereleases while the former doesn't.

I wouldn't put too much effort into making simplifications on VersionSpecifiers work, Ranges is a much better representation to work with.

Can we track this in a separate issue? It seems like a bigger lift, and I wouldn't mind looking into it as a follow up.

scripts/packages/dup-target/src/dup_target.egg-info/dependency_links.txt

konstin · 2025-10-01T09:24:27Z

crates/uv/src/commands/pip/tree.rs

+        let (lower, upper, others) = specifiers.into_iter().fold(
+            (None, None, Vec::new()),
+            |(lower, upper, mut rest), spec| match *spec.operator() {
+                Operator::GreaterThan | Operator::GreaterThanEqual => {
+                    (Some(Self::prefer_lower(lower, spec)), upper, rest)
+                }
+                Operator::LessThan | Operator::LessThanEqual => {
+                    (lower, Some(Self::prefer_upper(upper, spec)), rest)
+                }
+                _ => {
+                    rest.push(spec);
+                    (lower, upper, rest)
+                }
+            },
+        );
+
+        let mut merged = lower
+            .into_iter()
+            .chain(upper)
+            .chain(others)
+            .collect::<Vec<_>>();
+
+        let mut seen = FxHashSet::default();
+
+        merged.retain(|spec| seen.insert(spec.to_string()));
+
+        VersionSpecifiers::from_iter(merged)


Ideally we'd be using Ranges<Version>, which gives us a canonical representation. The problem is that iirc we don't have a function yet for that conversion that handles prereleases correctly. There's another catch to this that while >=2.0.0 is technically larger than >=2.0.0a1, the latter allows prereleases while the former doesn't.

I wouldn't put too much effort into making simplifications on VersionSpecifiers work, Ranges is a much better representation to work with.

crates/uv/tests/it/pip_tree.rs

crates/uv/src/commands/pip/tree.rs

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[checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-aarch64-pc-windows-msvc.zip.sha256) | | [uv-i686-pc-windows-msvc.zip](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-i686-pc-windows-msvc.zip.sha256) | | [uv-x86\_64-pc-windows-msvc.zip](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-x86_64-pc-windows-msvc.zip.sha256) | | [uv-aarch64-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-aarch64-unknown-linux-gnu.tar.gz) | ARM64 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-aarch64-unknown-linux-gnu.tar.gz.sha256) | | [uv-i686-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-i686-unknown-linux-gnu.tar.gz) | x86 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-i686-unknown-linux-gnu.tar.gz.sha256) | | [uv-powerpc64-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-powerpc64-unknown-linux-gnu.tar.gz) | PPC64 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-powerpc64-unknown-linux-gnu.tar.gz.sha256) | | [uv-powerpc64le-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-powerpc64le-unknown-linux-gnu.tar.gz) | PPC64LE Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-powerpc64le-unknown-linux-gnu.tar.gz.sha256) | | [uv-riscv64gc-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-riscv64gc-unknown-linux-gnu.tar.gz) | RISCV Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-riscv64gc-unknown-linux-gnu.tar.gz.sha256) | | [uv-s390x-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-s390x-unknown-linux-gnu.tar.gz) | S390x Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-s390x-unknown-linux-gnu.tar.gz.sha256) | | [uv-x86\_64-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-x86_64-unknown-linux-gnu.tar.gz) | x64 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-x86_64-unknown-linux-gnu.tar.gz.sha256) | | [uv-armv7-unknown-linux-gnueabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-armv7-unknown-linux-gnueabihf.tar.gz) | ARMv7 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-armv7-unknown-linux-gnueabihf.tar.gz.sha256) | | [uv-aarch64-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-aarch64-unknown-linux-musl.tar.gz) | ARM64 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-aarch64-unknown-linux-musl.tar.gz.sha256) | | [uv-i686-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-i686-unknown-linux-musl.tar.gz) | x86 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-i686-unknown-linux-musl.tar.gz.sha256) | | [uv-x86\_64-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-x86_64-unknown-linux-musl.tar.gz) | x64 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-x86_64-unknown-linux-musl.tar.gz.sha256) | | [uv-arm-unknown-linux-musleabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-arm-unknown-linux-musleabihf.tar.gz) | ARMv6 MUSL Linux (Hardfloat) | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-arm-unknown-linux-musleabihf.tar.gz.sha256) | | [uv-armv7-unknown-linux-musleabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-armv7-unknown-linux-musleabihf.tar.gz) | ARMv7 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.8.23/uv-armv7-unknown-linux-musleabihf.tar.gz.sha256) | </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. 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terror added 5 commits September 30, 2025 14:55

Add initial work

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Appease clippy

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Add unit tests

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terror marked this pull request as ready for review September 30, 2025 19:38

terror mentioned this pull request Sep 30, 2025

uv pip tree lists pylint's dep dill twice #16067

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terror added 4 commits October 1, 2025 10:32

Replace fold with imperative flow

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zanieb approved these changes Oct 1, 2025

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zanieb merged commit d51a1e7 into astral-sh:main Oct 1, 2025
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uv 0.8.23 Homebrew/homebrew-core#246898

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Deduplicate marker-specific dependencies in `uv pip tree` output #16078

Deduplicate marker-specific dependencies in `uv pip tree` output #16078

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	impl From<VersionSpecifiers> for Ranges<Version> {
	/// Convert [`VersionSpecifiers`] to a PubGrub-compatible version range, using PEP 440
	/// semantics.
	fn from(specifiers: VersionSpecifiers) -> Self {
	let mut range = Self::full();
	for specifier in specifiers {
	range = range.intersection(&Self::from(specifier));
	}
	range
	}

Deduplicate marker-specific dependencies in uv pip tree output #16078

Deduplicate marker-specific dependencies in uv pip tree output #16078

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Deduplicate marker-specific dependencies in `uv pip tree` output #16078

Deduplicate marker-specific dependencies in `uv pip tree` output #16078

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