比较 Python 3 中字典中的值不起作用？

Question

我一直在努力弄清楚如何在我的 Python 课程的作业中访问（和比较）字典中的值。

我认为我对键和值的理解足够好，但出于某种原因，无论我尝试比较值，我的程序似乎永远不会看到重复值。

为什么这不起作用？

  if new_value in b_dict.values():
    print("Password already exists...\n")
  else:
    add_to_dict(b_dict, new_key, new_value)
    print("\nPassword added successfully.\n")

完整节目：

def add_to_dict(dict, key, value):
  if key in dict:
    dict[key].append(value)
  else:
    dict[key] = [value]

if __name__ == "__main__":
  b_dict = {"att": ["12345"]}

  new_key = input("Please enter an organization ID to add: ")

  if new_key in b_dict:
    print("Organization exists, adding to this organization...")
  if new_key not in b_dict:
    print("Organization does not exist, adding it...")

  new_value = input("Please input a password: ")

  print("Adding password...")
  if new_value in b_dict.values():
    print("Password already exists...\n")
  else:
    add_to_dict(b_dict, new_key, new_value)
    print("\nPassword added successfully.\n")

  print(b_dict)

我希望当用户输入 att，然后输入 12345 时，程序会通知他们密码已经存在，然后打印原始字典。相反，它总是打印具有重复 12345 值的字典。

Answer 1

b_dict.values() 将包含 b_dict 所有键的所有值 - 这意味着它将包含 ['12345'] 但不包含 '12345' - 我认为你需要什么检查是

if [new_value] in b_dict.values()

但这适用于这种特殊情况，并且当您附加新值时，您可能需要分别遍历所有键或展平值

Answer 2

这段代码是否解决了您的问题？

  if key in dict:
    dict[key].append(value)
  else:
    dict[key] = [value]

def check_values(value,key) :
    if key in b_dict :
        return value in b_dict[key]
    else : 
        return False
if __name__ == "__main__":
  b_dict = {"att": ["12345"]}

  new_key = input("Please enter an organization ID to add: ")


  new_value = input("Please input a password: ")

  
  
  if check_values(new_value,new_key) == True :

      print("They already exist..")
  elif check_values(new_value,new_key) == False :
        print("They are not exits.. adding it")
        if new_key in b_dict :


            print("this Organization's password already exist")

        else :
            print("adding new organization and password")
            add_to_dict(b_dict, new_key, new_value)

  
print(b_dict)

比较 Python 3 中字典中的值不起作用？

Comparing values in dictionary in Python 3 not working?

dictionary

key

key-value

python-3.x