Add __file__ for imported modules

tests/snippets/builtin_file.py

@@ -0,0 +1,3 @@
+from import_file import import_file
+
+import_file()

tests/snippets/import_file.py

@@ -0,0 +1,4 @@
+import os
+
+def import_file():
+	assert os.path.basename(__file__) == "import_file.py"

vm/src/import.rs

@@ -48,12 +48,13 @@ pub fn import_file(
     content: String,
 ) -> PyResult {
     let sys_modules = vm.get_attribute(vm.sys_module.clone(), "modules").unwrap();
-    let code_obj = compile::compile(vm, &content, &compile::Mode::Exec, file_path)
+    let code_obj = compile::compile(vm, &content, &compile::Mode::Exec, file_path.clone())
         .map_err(|err| vm.new_syntax_error(&err))?;
     // trace!("Code object: {:?}", code_obj);
 
     let attrs = vm.ctx.new_dict();
     attrs.set_item("__name__", vm.new_str(module_name.to_string()), vm)?;
+    attrs.set_item("__file__", vm.new_str(file_path), vm)?;
     let module = vm.ctx.new_module(module_name, attrs.clone());
 
     // Store module in cache to prevent infinite loop with mutual importing libs: