stdlib: resolve absolute script paths independently of sys.path

stdlib/stdlib.go

@@ -229,6 +229,10 @@ var defaultPaths = []py.Object{
 
 func resolveRunPath(runPath string, opts py.CompileOpts, pathObjs []py.Object, tryPath func(pyPath string) (bool, error)) error {
 	runPath = strings.TrimSuffix(runPath, "/")
+	if filepath.IsAbs(runPath) {
+		// Absolute paths are independent of the configured search directories.
+		pathObjs = []py.Object{py.String("")}
+	}
 
 	var (
 		err  error

stdlib/stdlib_test.go

@@ -0,0 +1,34 @@
+// Copyright 2026 The go-python Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package stdlib
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/go-python/gpython/py"
+)
+
+func TestRunFileAbsolutePath(t *testing.T) {
+	filename := filepath.Join(t.TempDir(), "script.py")
+	if err := os.WriteFile(filename, []byte("value = 42\n"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	for _, useSysPaths := range []bool{false, true} {
+		ctx := NewContext(py.DefaultContextOpts())
+		defer ctx.Close()
+		// Absolute paths must work even without any search directories.
+		ctx.Store().MustGetModule("sys").Globals["path"] = py.NewList()
+		module, err := py.RunFile(ctx, filename, py.CompileOpts{UseSysPaths: useSysPaths}, nil)
+		if err != nil {
+			t.Errorf("UseSysPaths=%v: %v", useSysPaths, err)
+			continue
+		}
+		if module.Globals["value"] != py.Int(42) {
+			t.Errorf("UseSysPaths=%v: script was not executed", useSysPaths)
+		}
+	}
+}