I don't know if this is something that we want to add to localflavor, but in any case...

On Brazil, there are govern issued bank codes for each bank operating on the country (it's called COMPE code). These are easily available on the internet, and the list is updated every now and then, when a new bank starts to operate on the country.

We thought about adding a choices tuple (similar to br_states.STATE_CHOICES), since we'll be using this and maintaining anyway. Should I submit a PR for this?