Pre-PEP: Dictionary accumulator methods
Kent Johnson
kent37 at tds.net
Sat Mar 19 07:19:57 EST 2005
Brian van den Broek wrote:
> Raymond Hettinger said unto the world upon 2005-03-18 20:24:
>
>> I would like to get everyone's thoughts on two new dictionary methods:
>>
>> def appendlist(self, key, *values):
>> try:
>> self[key].extend(values)
>> except KeyError:
>> self[key] = list(values)
>>
> For appendlist, I would have expected
>
> def appendlist(self, key, sequence):
> try:
> self[key].extend(sequence)
> except KeyError:
> self[key] = list(sequence)
The original proposal reads better at the point of call when values is a single item. In my
experience this will be the typical usage:
d.appendlist(key, 'some value')
as opposed to your proposal which has to be written
d.appendlist(key, ['some value'])
The original allows values to be a sequence using
d.appendlist(key, *value_list)
Kent
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