I need to save a dataclasses object by one of its attributes user_id, and frequently query the user_id and delete it if the key exists. The UserInfo class is defined below:

@dataclass(frozen=True)
class UserInfo:
    user_id: int
    book: str
    bookshelf_color: str
    money: int
    size: int

# operation for this data structure D
if user_id in D:
   del D[user_id]

So far I can only think of using the built-in dict()(Or the Dict from typing in Python3) to store it: user_id as key, and UserInfo object as value. So deletion uses del keyword(Or pop? not sure which is better/Pythonic). But I was wondering if there's a more efficient solution?

CodePudding user response：

When you need to have a collection and query it by a key there isn't really a way to go about it that will be better than using a dict

Regarding del vs pop, since you say that the key will not always exist I would go with pop, but you can always use del and wrap it in try/except