diff --git a/src/dinner.py b/src/dinner.py
index 170df98..1544ab8 100644
--- a/src/dinner.py
+++ b/src/dinner.py
@@ -1,5 +1,6 @@
 import json
 from re import Pattern
+from itertools import chain
 
 from session import app
 from flask import render_template, make_response, abort
@@ -32,16 +33,13 @@ def fetch_user_menu_summary() -> dict[str, float]:
     all_menu = list(fetch_all_user_today_menu())
     if len(all_menu) > 0:
         menus = list(map(lambda x: json.loads(x[1]), all_menu))
-        menu_keys = set()
-        for x in menus:
-            for k in x:
-                menu_keys.add(k)
+        menu_keys = set(chain.from_iterable(menus))
         result = {}
         for k in menu_keys:
             result[k] = 0
-        for x in menus:
-            for k in x:
-                result[k] += x[k]
+        for user_menu in menus:
+            for k in user_menu:
+                result[k] += user_menu[k]
         return result
     return {}
 
@@ -106,20 +104,18 @@ def dinner_update():
         abort(403)
     if check_roll() != 0:
         return make_response(json.dumps(dict(code=-1, data="来晚了，提交失败")))
-    value = request.args.get('value').strip()
-    if not value:
+    user_menu = request.args.get('value').strip()
+    if not user_menu:
         set_user_menu('')
         return make_response(json.dumps(dict(code=0, data="OK")))
-    value = json.loads(value)
-    summary = 0
-    for key in value:
-        summary += int(value[key])
+    user_menu = json.loads(user_menu)
+    summary = sum(abs(int(value)) for value in user_menu.values())
     if summary <= 0:
         set_user_menu('')
         return make_response(json.dumps(dict(code=0, data="OK")))
-    for key in value:
-        value[key] = int(value[key]) / summary
-    set_user_menu(json.dumps(value, ensure_ascii=False))
+    for key in user_menu:
+        user_menu[key] = abs(int(user_menu[key])) / summary
+    set_user_menu(json.dumps(user_menu, ensure_ascii=False))
     return make_response(json.dumps(dict(code=0, data="OK")))
 
 
diff --git a/src/start.py b/src/start.py
index cf3f3d6..7f335ae 100644
--- a/src/start.py
+++ b/src/start.py
@@ -1,11 +1,9 @@
 import os
 from flask import redirect, send_from_directory
-import threading
+# noinspection PyUnresolvedReferences
 from dinner import *
 from session import app
 
-lock = threading.Lock()
-
 
 @app.route('/')
 def index():