[Python-ideas] question - 'bag' type

[Chris Rebert]

On Wed, Apr 14, 2010 at 10:12 PM, C. Titus Brown <ctb at msu.edu> wrote:
> On Thu, Apr 15, 2010 at 12:08:26AM -0500, Daniel Stutzbach wrote:
>> On Thu, Apr 15, 2010 at 12:02 AM, C. Titus Brown <ctb at msu.edu> wrote:
>> > this seems like the right forum to ask -- is there a reason why Python
>> > doesn't have a 'bag' builtin type, e.g.
>> >
>> Python 2.7 and 3.1 have a Counter type, that is similar to (but not
>> identical to) that recipe:
>>
>> http://docs.python.org/py3k/library/collections.html#collections.Counter
>
> Huh, seems like a different use case from mine -- I just would like to be able
> to refer to dictionary keys as attributes.  So I guess the cookbook recipe
> distracted you from my real interest, which is the short notation:
>
>   b = bag(foo=bar, bif=baz)
>
>   assert b.foo == bar
>   assert b.bif == baz
>
> Still curious :)

Also, that's not a bag at all. Seems you're looking for something
similar to namedtuple:
http://docs.python.org/dev/library/collections.html#collections.namedtuple

For the record, a bag is an unordered collection that permits
duplicate elements. Sort of like an unordered, unindexable list, or a
set that allows duplicate elements.
It's got nothing whatsoever to do with being able to access elements
using attribute syntax.

Cheers,
Chris
--
http://blog.rebertia.com