Fix examples/package_embed (RustPython#5096)

Author: youknowone

examples/package_embed.rs

@@ -4,8 +4,9 @@ use vm::{builtins::PyStrRef, Interpreter};
 
 fn py_main(interp: &Interpreter) -> vm::PyResult<PyStrRef> {
     interp.enter(|vm| {
+        // Add local library path
         vm.insert_sys_path(vm.new_pyobj("examples"))
-            .expect("add path");
+            .expect("add examples to sys.path failed");
         let module = vm.import("package_embed", None, 0)?;
         let name_func = module.get_attr("context", vm)?;
         let result = name_func.call((), vm)?;
@@ -15,7 +16,10 @@ fn py_main(interp: &Interpreter) -> vm::PyResult<PyStrRef> {
 }
 
 fn main() -> ExitCode {
-    let interp = vm::Interpreter::with_init(Default::default(), |vm| {
+    // Add standard library path
+    let mut settings = vm::Settings::default();
+    settings.path_list.push("Lib".to_owned());
+    let interp = vm::Interpreter::with_init(settings, |vm| {
         vm.add_native_modules(rustpython_stdlib::get_module_inits());
     });
     let result = py_main(&interp);