On 2/20/06, Guido van Rossum <[EMAIL PROTECTED]> wrote: > [stuff with typos]
Here's the proofread version: I have a patch ready that implements this. I've assigned it to Raymond for review. I'm just reusing the same SF patch as before: http://python.org/sf/1433928 . One subtlety: for maximal flexibility and speed, the standard dict type now defines an on_missing(key) method; however this version *just* raises KeyError and the implementation actually doesn't call it unless the class is a subtype (with the possibility of overriding on_missing()). collections.defaultdict overrides on_missing(key) to insert and return self.default_factory() if it is not None; otherwise it raises KeyError. (It should really call the base class on_missing() but I figured I'd just in-line it which is easier to code in C than a super-call.) The defaultdict signature takes an optional positional argument which is the default_factory, defaulting to None. The remaining positional and all keyword arguments are passed to the dict constructor. IOW: d = defaultdict(list, [(1, 2)]) is equivalent to: d = defaultdict() d.default_factory = list d.update([(1, 2)]) At this point, repr(d) will be: defaultdict(<type 'list'>, {1: 2}) Once Raymond approves the patch I'll check it in. -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
