Fix handling of Python requests with pre-releases in ranges

crates/uv-python/src/discovery.rs

@@ -2,6 +2,7 @@ use itertools::{Either, Itertools};
 use regex::Regex;
 use rustc_hash::{FxBuildHasher, FxHashSet};
 use same_file::is_same_file;
+use std::borrow::Cow;
 use std::env::consts::EXE_SUFFIX;
 use std::fmt::{self, Debug, Formatter};
 use std::{env, io, iter};
@@ -2692,7 +2693,16 @@ impl VersionRequest {
                     && variant.matches_interpreter(interpreter)
             }
             Self::Range(specifiers, variant) => {
-                let version = interpreter.python_version().only_release();
+                // If the specifier contains pre-releases, use the full version for comparison.
+                // Otherwise, strip pre-release so that, e.g., `>=3.14` matches `3.14.0rc3`.
+                let version = if specifiers
+                    .iter()
+                    .any(uv_pep440::VersionSpecifier::any_prerelease)
+                {
+                    Cow::Borrowed(interpreter.python_version())
+                } else {
+                    Cow::Owned(interpreter.python_version().only_release())
+                };
                 specifiers.contains(&version) && variant.matches_interpreter(interpreter)
             }
             Self::MajorMinorPrerelease(major, minor, prerelease, variant) => {
@@ -2725,7 +2735,19 @@ impl VersionRequest {
                 (version.major(), version.minor(), version.patch())
                     == (*major, *minor, Some(*patch))
             }
-            Self::Range(specifiers, _) => specifiers.contains(&version.version.only_release()),
+            Self::Range(specifiers, _) => {
+                // If the specifier contains pre-releases, use the full version for comparison.
+                // Otherwise, strip pre-release so that, e.g., `>=3.14` matches `3.14.0rc3`.
+                let version = if specifiers
+                    .iter()
+                    .any(uv_pep440::VersionSpecifier::any_prerelease)
+                {
+                    Cow::Borrowed(&version.version)
+                } else {
+                    Cow::Owned(version.version.only_release())
+                };
+                specifiers.contains(&version)
+            }
             Self::MajorMinorPrerelease(major, minor, prerelease, _) => {
                 (version.major(), version.minor(), version.pre())
                     == (*major, *minor, Some(*prerelease))

crates/uv/tests/it/python_find.rs

@@ -1335,3 +1335,101 @@ fn python_find_freethreaded_314() {
     ----- stderr -----
     ");
 }
+
+#[test]
+fn python_find_prerelease_version_specifiers() {
+    let context: TestContext = TestContext::new_with_versions(&[])
+        .with_filtered_python_keys()
+        .with_filtered_python_sources()
+        .with_managed_python_dirs()
+        .with_python_download_cache()
+        .with_filtered_python_install_bin()
+        .with_filtered_python_names()
+        .with_filtered_exe_suffix();
+
+    context.python_install().arg("3.14.0rc2").assert().success();
+    context.python_install().arg("3.14.0rc3").assert().success();
+
+    // `>=3.14` should allow pre-release versions
+    uv_snapshot!(context.filters(), context.python_find().arg(">=3.14"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    [TEMP_DIR]/managed/cpython-3.14.0rc3-[PLATFORM]/[INSTALL-BIN]/[PYTHON]
+
+    ----- stderr -----
+    ");
+
+    // `>3.14rc2` should not match rc2
+    uv_snapshot!(context.filters(), context.python_find().arg(">3.14.0rc2"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    [TEMP_DIR]/managed/cpython-3.14.0rc3-[PLATFORM]/[INSTALL-BIN]/[PYTHON]
+
+    ----- stderr -----
+    ");
+
+    // `>3.14rc3` should not match rc3
+    uv_snapshot!(context.filters(), context.python_find().arg(">3.14.0rc3"), @r"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: No interpreter found for Python >3.14.0rc3 in [PYTHON SOURCES]
+    ");
+
+    // `>=3.14.0rc3` should match rc3
+    uv_snapshot!(context.filters(), context.python_find().arg(">=3.14.0rc3"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    [TEMP_DIR]/managed/cpython-3.14.0rc3-[PLATFORM]/[INSTALL-BIN]/[PYTHON]
+
+    ----- stderr -----
+    ");
+
+    // `<3.14.0rc3` should match rc2
+    uv_snapshot!(context.filters(), context.python_find().arg("<3.14.0rc3"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    [TEMP_DIR]/managed/cpython-3.14.0rc2-[PLATFORM]/[INSTALL-BIN]/[PYTHON]
+
+    ----- stderr -----
+    ");
+
+    // `<=3.14.0rc3` should match rc3
+    uv_snapshot!(context.filters(), context.python_find().arg("<=3.14.0rc3"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    [TEMP_DIR]/managed/cpython-3.14.0rc3-[PLATFORM]/[INSTALL-BIN]/[PYTHON]
+
+    ----- stderr -----
+    ");
+
+    // Install the stable version
+    context.python_install().arg("3.14.0").assert().success();
+
+    // `>=3.14` should prefer stable
+    uv_snapshot!(context.filters(), context.python_find().arg(">=3.14"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    [TEMP_DIR]/managed/cpython-3.14.0-[PLATFORM]/[INSTALL-BIN]/[PYTHON]
+
+    ----- stderr -----
+    ");
+
+    // `>3.14rc2` should prefer stable
+    uv_snapshot!(context.filters(), context.python_find().arg(">3.14.0rc2"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    [TEMP_DIR]/managed/cpython-3.14.0-[PLATFORM]/[INSTALL-BIN]/[PYTHON]
+
+    ----- stderr -----
+    ");
+}