destructuring tuple and list
Hans Nowak
hans at zephyrfalcon.org
Wed Mar 17 15:03:59 EST 2004
Diez B. Roggisch wrote:
> I've also thought about that. s/t like real pattern matching might be cool,
> but is probably too much of a paradigm shift.
>
> What I do is this:
>
> l = (5,6,3,4)
> x,y,tail = l[0:2], l[:2]
This does not seem to work, though:
>>> l = (5, 6, 3, 4)
>>> x, y, tail = l[0:2], l[:2]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
ValueError: unpack tuple of wrong size
What does work is:
>>> (x, y), tail = l[0:2], l[2:]
>>> print x, y, tail
5 6 (3, 4)
>>>
Or maybe:
>>> x, y, tail = l[0], l[1], l[2:]
Cheers,
--
Hans (hans at zephyrfalcon.org)
http://zephyrfalcon.org/
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