Corections after review

gui/widgets/label.py

@@ -3,12 +3,13 @@
 # Released under the MIT License (MIT). See LICENSE.
 # Copyright (c) 2018-2020 Peter Hinch
 
+from micropython import const
 from gui.core.nanogui import DObject
 from gui.core.writer import Writer
 
-ALIGN_LEFT = 0
-ALIGN_RIGHT = 1
-ALIGN_CENTER = 2
+ALIGN_LEFT = const(0)
+ALIGN_RIGHT = const(1)
+ALIGN_CENTER = const(2)
 
 # text: str display string int save width
 class Label(DObject):