Python找不到我的值

我有一个python脚本从我的MySQL数据库中取出我的数据并将其转换为python字典。我试图使用in关键字在python字典中找到我的会话令牌，但由于某种原因它不起作用。
我试着用这个python函数来看看是否有不同的字符串在结尾处有一个奇怪的格式或字符，但这不起作用：
功能：

def difference(string1, string2):
      # Split both strings into list items
  string1 = string1.split()
  string2 = string2.split()

  A = set(string1) # Store all string1 list items in set A
  B = set(string2) # Store all string2 list items in set B
 
  str_diff = A.symmetric_difference(B)
  isEmpty = (len(str_diff) == 0)
 
  if isEmpty:
    print("No Difference. Both Strings Are Same")
  else:
    print("The Difference Between Two Strings: ")
    print(str_diff)
  
  print('The programs runs successfully.')

代码

下面是代码。（这只是一个片段，加密密钥将在启动时更改。）

try:
            import Debug
            Debug.difference(token, USERS['danielcaminero@plairstudio.com']['session'])
            print(token)
            print(USERS['danielcaminero@plairstudio.com']['session'])
            print(USERS)
            # check if user exists
            if token not in USERS:
                print("Doesnt work :(")
                raise Exception('Invalid token')

        except:
            
            return {'message': 'Invalid token'}, 401

输出

No Difference. Both Strings Are Same
The programs runs successfully.
2681bd95970590adcd5950a3f7c90ef7
2681bd95970590adcd5950a3f7c90ef7
{'danielcaminero@plairstudio.com': {'password': '44b4cedfad79d8e47d1430b4da4198f72162dbc0d49452d8dc968546e1b48f14', 'role': '1', 'id': 1, 'session': '2681bd95970590adcd5950a3f7c90ef7'}}
Doesnt work :(
127.0.0.1 - - [09/Apr/2023 14:00:52] "GET /protected HTTP/1.1" 401 -

我需要什么

请告诉我什么可能是错误的，或者我如何使这段代码与我的字典结构一起工作，因为我的程序的某些部分依赖于它。