diff --git a/lib/assets/libs/_sys.js b/lib/assets/libs/_sys.js
new file mode 100644
--- /dev/null
+++ b/lib/assets/libs/_sys.js
@@ -0,0 +1,44 @@
+var $module=(function($B){
+    var _b_=$B.builtins
+    return {
+        // Called "Getframe" because "_getframe" wouldn't be imported in 
+        // sys.py with "from _sys import *"
+        Getframe : function(depth){
+            return $B._frame($B.frames_stack, depth)
+        },
+        argv:
+            {'__get__':function(){return 'essai'}
+            },
+        modules :
+            {'__get__':function(){return $B.obj_dict($B.imported)},
+             '__set__':function(self, obj, value){ throw _b_.TypeError("Read only property 'sys.modules'") }
+            },
+        path: 
+            {'__get__':function(){return $B.path},
+             '__set__':function(self, obj, value){ $B.path = value }
+            },
+        meta_path: 
+            {'__get__':function(){return $B.meta_path},
+             '__set__':function(self, obj, value){ $B.meta_path = value }
+            },
+        path_hooks: 
+            {'__get__':function(){return $B.path_hooks},
+             '__set__':function(self, obj, value){ $B.path_hooks = value }
+            },
+        path_importer_cache: 
+            {'__get__':function(){return _b_.dict($B.JSObject($B.path_importer_cache))},
+             '__set__':function(self, obj, value){ throw _b_.TypeError("Read only property 'sys.path_importer_cache'") }
+            },
+        stderr : {
+            __get__:function(){return $B.stderr},
+            __set__:function(self, obj, value){$B.stderr = value},
+            write:function(data){_b_.getattr($B.stderr,"write")(data)}
+            },
+        stdout : {
+            __get__:function(){return $B.stdout},
+            __set__:function(self, obj, value){$B.stdout = value},
+            write:function(data){_b_.getattr($B.stdout,"write")(data)}
+            },
+        stdin : $B.stdin
+    }
+})(__BRYTHON__)