In difflib, there's an example where it would be easy to run performance tests.

            match tag:
                case 'replace':
                    g = self._fancy_replace(a, alo, ahi, b, blo, bhi)
                case 'delete':
                    g = self._dump('-', a, alo, ahi)
                case 'insert':
                    g = self._dump('+', b, blo, bhi)
                case 'equal':
                    g = self._dump(' ', a, alo, ahi)
                case _:
                    raise ValueError('unknown tag %r' % (tag,))