May 25, 2016
2:40 p.m.
On Wed, May 25, 2016, at 09:11, Michael Selik wrote:
Python's iterable unpacking is what Lispers might call a destructuring bind.
py> iterable = 1, 2, 3, 4, 5 py> a, b, *rest = iterable py> a, b, rest (1, 2, (3, 4, 5))
Clojure also supports mapping destructuring. Let's add that to Python!
py> mapping = {"a": 1, "b": 2, "c": 3} py> {"a": x, "b": y, "c": z} = mapping py> x, y, z (1, 2, 3) py> {"a": x, "b": y} = mapping Traceback: ValueError: too many keys to unpack
How is this better than:
mapping = {"a": 1, "b": 2, "c": 3} x, y, z = mapping[k] for k in ("a", "b", "c")