refactor callback hell

recipe.py

@@ -5,12 +5,8 @@
 # All rights reserved
 #
 # THIS SOFTWARE IS PROVIDED AS IS WITHOUT WARRANTY
-from sqlite3 import Cursor
-from typing import Union
-
-import urwid
-from urwid import raw_display
-from app.widgets import (AutoCompleteEdit, AutoCompleteFloatEdit)
+from psycopg import Cursor
+from urwid import raw_display, WidgetPlaceholder, SolidFill, MainLoop
 from app.activities import ActivityManager, show_or_exit
 from app.activities.RecipeEditor import RecipeEditor
 from app.db_utils import QueryManager, display_mapper
@@ -36,9 +32,9 @@ except:
     exit(1)
     #from mock import *
 
-class Recipe(urwid.WidgetPlaceholder):
+class Recipe(WidgetPlaceholder):
     def __init__(self, activity_manager):
-        super().__init__(urwid.SolidFill(u'/'))
+        super().__init__(SolidFill(u'/'))
         self.activity_manager = activity_manager
         recipe = self.activity_manager.get('recipe_editor')
 
@@ -67,7 +63,7 @@ def iter_palettes():
 palettes = iter_palettes()
 
 screen = raw_display.Screen()
-loop = urwid.MainLoop(app, next(palettes), screen=screen,
+loop = MainLoop(app, next(palettes), screen=screen,
         unhandled_input=lambda k: show_or_exit(k, screen=screen, palettes=palettes),
         pop_ups=True)
 loop.run()