I also (with others) prefer `else:` or perhaps `case else:` to using the`_` variable. The latter is obscure, and woudn't sit well with code that already uses that variable for its own purposes.
I think that's done for consistency. '_' is a wildcard and you can have:
case (_, _):
to match any 2-tuple, so:
would match any value, and can thus already serve as the default.
Consistency with what? Where else is `_` currently used as a wildcard?