Ignore pre-release versions in uv init --script

.python-versions

@@ -10,3 +10,5 @@
 3.9.12
 # The following is needed for `==3.13` request tests
 3.13.0
+# A pre-release version required for testing
+3.14.0rc2

crates/uv-python/src/discovery.rs

@@ -727,7 +727,7 @@ fn python_interpreters<'a>(
     cache: &'a Cache,
     preview: Preview,
 ) -> impl Iterator<Item = Result<(PythonSource, Interpreter), Error>> + 'a {
-    python_interpreters_from_executables(
+    let interpreters = python_interpreters_from_executables(
         // Perform filtering on the discovered executables based on their source. This avoids
         // unnecessary interpreter queries, which are generally expensive. We'll filter again
         // with `interpreter_satisfies_environment_preference` after querying.
@@ -761,7 +761,21 @@ fn python_interpreters<'a>(
     })
     .filter_ok(move |(source, interpreter)| {
         satisfies_python_preference(*source, interpreter, preference)
-    })
+    });
+
+    if std::env::var(uv_static::EnvVars::UV_INTERNAL__TEST_PYTHON_MANAGED).is_ok() {
+        Either::Left(interpreters.map_ok(|(source, interpreter)| {
+            // In test mode, change the source to `Managed` if a version was marked as such via
+            // `TestContext::with_versions_as_managed`.
+            if interpreter.is_managed() {
+                (PythonSource::Managed, interpreter)
+            } else {
+                (source, interpreter)
+            }
+        }))
+    } else {
+        Either::Right(interpreters)
+    }
 }
 
 /// Lazily convert Python executables into interpreters.

crates/uv/src/commands/project/mod.rs

@@ -2434,7 +2434,7 @@ pub(crate) async fn init_script_python_requirement(
 ) -> anyhow::Result<RequiresPython> {
     let python_request = if let Some(request) = python {
         // (1) Explicit request from user
-        PythonRequest::parse(request)
+        Some(PythonRequest::parse(request))
     } else if let (false, Some(request)) = (
         no_pin_python,
         PythonVersionFile::discover(
@@ -2445,14 +2445,14 @@ pub(crate) async fn init_script_python_requirement(
         .and_then(PythonVersionFile::into_version),
     ) {
         // (2) Request from `.python-version`
-        request
+        Some(request)
     } else {
-        // (3) Assume any Python version
-        PythonRequest::Any
+        // (3) No explicit request
+        None
     };
 
     let interpreter = PythonInstallation::find_or_download(
-        Some(&python_request),
+        python_request.as_ref(),
         EnvironmentPreference::Any,
         python_preference,
         python_downloads,

crates/uv/tests/it/init.rs

@@ -901,6 +901,49 @@ fn init_script_shebang() -> Result<()> {
     Ok(())
 }
 
+// Make sure that `uv init --script` picks the latest non-pre-release version of Python
+// for the `requires-python` constraint.
+#[cfg(feature = "python-patch")]
+#[test]
+fn init_script_picks_latest_stable_version() -> Result<()> {
+    let managed_versions = &["3.14.0rc2", "3.13", "3.12"];
+    // If we do not mark these versions as managed, they would have `PythonSource::SearchPath(First)`, which
+    // would mean that pre-releases would be preferred without opt-in (see `PythonSource::allows_prereleases`).
+    let context =
+        TestContext::new_with_versions(managed_versions).with_versions_as_managed(managed_versions);
+
+    let script_path = context.temp_dir.join("main.py");
+
+    uv_snapshot!(context.filters(), context.init().arg("--script").arg("main.py"), @r#"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Initialized script at `main.py`
+    "#);
+
+    let resulting_script = fs_err::read_to_string(&script_path)?;
+    assert_snapshot!(
+        resulting_script, @r#"
+        # /// script
+        # requires-python = ">=3.13"
+        # dependencies = []
+        # ///
+
+
+        def main() -> None:
+            print("Hello from main.py!")
+
+
+        if __name__ == "__main__":
+            main()
+        "#
+    );
+
+    Ok(())
+}
+
 /// Run `uv init --lib` with an existing py.typed file
 #[test]
 fn init_py_typed_exists() -> Result<()> {

crates/uv/tests/it/pip_install.rs

@@ -12035,7 +12035,7 @@ fn install_python_preference() {
     ----- stdout -----
 
     ----- stderr -----
-    Using CPython 3.12.[X] interpreter at: [PYTHON-3.12]
+    Using CPython 3.12.[X]
     Creating virtual environment at: .venv
     Activate with: source .venv/[BIN]/activate
     ");

crates/uv/tests/it/sync.rs

@@ -12644,7 +12644,7 @@ fn sync_python_preference() -> Result<()> {
     ----- stdout -----
 
     ----- stderr -----
-    Using CPython 3.12.[X] interpreter at: [PYTHON-3.12]
+    Using CPython 3.12.[X]
     Removed virtual environment at: .venv
     Creating virtual environment at: .venv
     Resolved 1 package in [TIME]
@@ -12698,7 +12698,7 @@ fn sync_python_preference() -> Result<()> {
     ----- stdout -----
 
     ----- stderr -----
-    Using CPython 3.12.[X] interpreter at: [PYTHON-3.12]
+    Using CPython 3.12.[X]
     Removed virtual environment at: .venv
     Creating virtual environment at: .venv
     Resolved 1 package in [TIME]

crates/uv/tests/it/venv.rs

@@ -1359,7 +1359,7 @@ fn venv_python_preference() {
     ----- stdout -----
 
     ----- stderr -----
-    Using CPython 3.12.[X] interpreter at: [PYTHON-3.12]
+    Using CPython 3.12.[X]
     Creating virtual environment at: .venv
     Activate with: source .venv/[BIN]/activate
     ");
@@ -1394,7 +1394,7 @@ fn venv_python_preference() {
     ----- stdout -----
 
     ----- stderr -----
-    Using CPython 3.12.[X] interpreter at: [PYTHON-3.12]
+    Using CPython 3.12.[X]
     Creating virtual environment at: .venv
     warning: A virtual environment already exists at `.venv`. In the future, uv will require `--clear` to replace it
     Activate with: source .venv/[BIN]/activate
@@ -1406,7 +1406,7 @@ fn venv_python_preference() {
     ----- stdout -----
 
     ----- stderr -----
-    Using CPython 3.12.[X] interpreter at: [PYTHON-3.12]
+    Using CPython 3.12.[X]
     Creating virtual environment at: .venv
     warning: A virtual environment already exists at `.venv`. In the future, uv will require `--clear` to replace it
     Activate with: source .venv/[BIN]/activate