Re: Pre-PEP: Dictionary accumulator methods

[Evan Simpson]

Raymond Hettinger wrote:
I would like to get everyone's thoughts on two new dictionary methods:
        def count(self, value, qty=1):
        def appendlist(self, key, *values):
-1.0
When I need these, I just use subtype recipes.  They seem way too 
special-purpose for the base dict type.

class Counter(dict):
    def __iadd__(self, other):
        if other in self:
            self[other] += 1
        else:
            self[other] = 1
        return self
c = Counter()
for item in items:
    c += item
class Collector(dict):
    def add(self, key, value):
        if key in self:
            self[key].append(value)
        else:
            self[key] = [value]
c = Collector()
for k,v in items:
    c.add(k, v)
Cheers,
Evan @ 4-am
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