[Typing-sig] Re: Any way to express that a dict is expected to have a key(s) but don't care about other keys?

def transpose(p: P) -> P:      return {         **p,         "x": p['y'], "y": p['x'],     }

There's also the older way, which should work even on Python 2:     def transpose(p: P) -> P:         return dict(p, x=p['y'], y=p['x'])