Special-case == Python version request ranges (#9697)

Related to #9695

Doesn't solve the reported issue with `requires-python` because that
doesn't go through the parser


https://github.com/astral-sh/uv/blob/6ed6fc108e95e742075cf1eddb09ec86c04f632e/crates/uv/src/commands/project/mod.rs#L518-L526

Author: zanieb

crates/uv-python/src/discovery.rs

@@ -3324,6 +3324,11 @@ fn parse_version_specifiers_request(
     if specifiers.is_empty() {
         return Err(Error::InvalidVersionRequest(s.to_string()));
     }
+    if let [specifier] = specifiers.iter().as_slice() {
+        if specifier.operator() == &uv_pep440::Operator::Equal {
+            return VersionRequest::from_str(&specifier.version().to_string());
+        }
+    }
     Ok(VersionRequest::Range(specifiers, variant))
 }
 

crates/uv/tests/it/python_find.rs

@@ -1513,3 +1513,26 @@ fn python_find_prerelease_with_patch_request() {
     ----- stderr -----
     ");
 }
+
+#[test]
+fn python_find_equal() {
+    let context = uv_test::test_context_with_versions!(&["3.11", "3.12"]);
+
+    uv_snapshot!(context.filters(), context.python_find().arg("==3.11"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    [PYTHON-3.11]
+
+    ----- stderr -----
+    "###);
+
+    uv_snapshot!(context.filters(), context.python_find().arg("==3.12"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    [PYTHON-3.12]
+
+    ----- stderr -----
+    "###);
+}