如何从字典中删除一个键值？

Question

我正在尝试使用 del 函数删除用户的特定输入，但它会删除它下面的整个键值

for account3 in accounts:
    print("\t   ", account3["Name"].ljust(25), account3["Username"].ljust(27), account3["Password"])

    userinput = input('Account Name you want to delete: ')
    for account4 in accounts:
        if userinput == account4["Name"]:
            userinput = input('Re-enter name to confirm: ')

            for account5 in accounts:
                if userinput == account5["Name"]:
                    del account5["Name"], account5["Username"], account5["Password"]
                    print('Deleted Successfully!')
                    menu()
                    break

用户确认删除后，删除字典中的所有值，并给出key error: "name"。有没有办法只删除用户提供的信息？

Answer 1

将值设置为 None 是您想要的，而不是删除条目。

用这个替换del 行。

account5["Name"], account5["Username"], account5["Password"] = None, None, None

Answer 2

为避免多次遍历列表以找到匹配的帐户，我建议构建一个将名称映射到每个帐户的字典，并使用 accounts.remove() 删除该帐户。

accounts_by_name = {account["Name"]: account for account in accounts}

for account in accounts:
    print("\t   ", account3["Name"].ljust(25), account3["Username"].ljust(27), account3["Password"])
    name = input("Account name you want to delete: ")
    if name not in accounts_by_name:
        continue
    if input("Re-enter name to confirm: ") != name:
        continue
    accounts.remove(accounts_by_name[name])
    menu()
    break