[uryga]

what do you mean by pattern matching in python 3? the only thing that sounds similar is (nested) iterable unpacking:

  (a, (b, c)) = foo()
  (fst, *middle, last) = foo()

which is nice but i wouldn't really call it pattern matching because i can't do something like

  match xs:
    when (): ...
    when (x, *rest): ...

i.e. do different things based on the shape of the data.