18-08-2009 o 22:27:41 Nat Williams <nat.willi...@gmail.com> wrote:
On Tue, Aug 18, 2009 at 2:44 PM, Pavel Panchekha <pavpanche...@gmail.com>wrote:I want a dictionary that will transparently "inherit" from a parent dictionary. So, for example: """ a = InheritDict({1: "one", 2: "two", 4: "four"}) b = InheritDict({3: "three", 4: "foobar"}, inherit_from=a) a[1] # "one" a[4] # "four" b[1] # "one" b[3] # "three" b[4] # "foobar" """ I've written something like this in Python already, but I'm wondering if something like this already exists, preferably written in C, for speed.Why complicate this with a custom object? Just use regular dicts and make b a copy of a.a = {1: 'one', 2: 'two', 4: 'four'} b = dict(a) b[3] = 'three' b[4] = 'foobar'
Because, as I understand Pavel's intent, it has to work dynamically (e.g. changes in 'a' reflect in behaviour of 'b'), and obviously not only for such trivial examples like above. *j -- Jan Kaliszewski (zuo) <z...@chopin.edu.pl> -- http://mail.python.org/mailman/listinfo/python-list
