fix restarting will not backup

bot.py

@@ -39,6 +39,7 @@ def on_chat(msg):
         if command[0] == '/restart' and str(from_id) in config.ADMIN:
             bot.sendMessage(chat_id, "即將更新並重新啟動")
             print("Restarting...")
+            backup_db()
             time.sleep(1)
             os._exit(0)
 
@@ -134,12 +135,29 @@ def on_chat(msg):
                 else:
                     user.send_answer('', msg['document']['file_id'])
 
+def backup_db():
+    users_backup = {}
+    for key in users.keys():
+        user = users[key]
+        users_backup[key] = {
+            'userid': user.userid,
+            'username': user.username,
+            'password': user.password,
+            'status': user.status,
+            'question': user.question
+        }
+    with open('users.json', 'w') as f:
+        json.dump(users_backup, f, indent='    ')
+
+def restore_db():
+    with open('users.json', 'r') as f:
+        users_restore = json.load(f)
+        for key in users_restore.keys():
+            user = users_restore[key]
+            users[key] = kuser(user['userid'], user['username'], user['password'], user['status'], user['question'])
+
 # restore
-with open('users.json', 'r') as f:
+restore_db()
-    users_restore = json.load(f)
-    for key in users_restore.keys():
-        user = users_restore[key]
-        users[key] = kuser(user['userid'], user['username'], user['password'], user['status'], user['question'])
 
 # start this bot
 MessageLoop(bot, on_chat).run_as_thread()
@@ -152,15 +170,4 @@ while True:
     bot.getMe()
 
     # backup
-    users_backup = {}
+    backup_db()
-    for key in users.keys():
-        user = users[key]
-        users_backup[key] = {
-            'userid': user.userid,
-            'username': user.username,
-            'password': user.password,
-            'status': user.status,
-            'question': user.question
-        }
-    with open('users.json', 'w') as f:
-        json.dump(users_backup, f, indent='    ')