I have two enums NAME and ALIAS which are guaranteed to have the same number of constants, and I need a way to convert each constant from NAME to its corresponding one from ALIAS, and vice-versa. For example:

def name_to_alias(name):
    if name == Name.PAUL:
        return Alias.STARCHILD
    elif name == Name.GENE:
        return Alias.DEMON
    ...

def alias_to_name(alias):
    if alias == Alias.STARCHILD:
        return Name.PAUL
    elif alias == Alias.DEMON:
        return Name.GENE
    ...

I don’t wish to maintain two functions (or dicts) like these. Ideally, I’d have the enum mappings in a single data structure which I can access from both conversion functions.

I’m thinking of something like:

mappings = {
    Name.PAUL: Alias.STARCHILD
    Name.GENE: Alias.DEMON
    ...
}

This would work for converting from Name to Alias, but the opposite may have issues (what happens if I accidentally have two dict keys with the same value?). Is there an easy and safe way to achieve this?