[Python-ideas] Dict with inverse form

[João Bernardo]

On Fri, Feb 12, 2016 at 2:07 AM, Andrew Barnert <abarnert at yahoo.com> wrote:
>
> For example, when I've built something like this, sometimes I want errors
> on duplicate values, sometimes just pick one arbitrarily, sometimes I want
> the inverse dict to store sets of values, and sometimes I even want _both_
> to store sets of values. Do you want to do just one of those, or two or
> more? Controlled by flags? Or different attribute names? Or different
> classes?
>

My use case is quite simple. I believe I always used this pattern on a
one-to-one mapping, so allowing repeated values to overwrite or throwing an
error is not exactly important to me, but it may be to someone else.

Someone suggested a MultiDict sort of thing, but I don't think I need that
amount of complexity here.

I will write a concrete class and post on PyPI then.

João Bernardo
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