mblume wrote:
2) setdefault is your friend
d = {}
d['a'] = d.setdefault('a', 1) + 1
d['a'] = d.get('a', 1) + 1
seems to me a little better, as d['a'] doesn't get set twice, right?
setdefault is pronounced "get, and set if necessary". it only updates
the dictionary if the key isn't already there:
>>> help({}.setdefault)
Help on built-in function setdefault:
setdefault(...)
D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D
(since setdefault is a method, the second argument is evaluated whether
it's used or not, but that's true for your approach as well, and isn't
much of a problem for a light-weight object like the integer 1.)
</F>
--
http://mail.python.org/mailman/listinfo/python-list
