[portland] Still Having List/Tuple Problems

[Rich Shepard]

On Wed, 16 Apr 2008, Dylan Reinhardt wrote:

> Another approach to add to the pile:
>
>>>> my_tuples = [('A',1),('A',2), ('A',3), ('A',4), ('B',1), ('B',2),
> ('B',3), ('B',4)]
>>>> grouper = {}
>>>> for left, right in my_tuples:
> ...         grouper.setdefault(left, []).append(right)
> ...
>
> now you have a dict with values groped by keys, as shown below...
>
>>>> for key in grouper.keys():
> ...        print key
> ...        for value in grouper[key]:
> ...             print '\t%s' % value
> ...
> A
> 	1
> 	2
> 	3
> 	4
> B
> 	1
> 	2
> 	3
> 	4

Dylan,

   Thank you for expanding my horizons. While all the examples print the
right side item of each tuple, I need to interate through those for each
left side item. It's fighting me, but that's my lack of python experience
showing up. I'll get there.

Much appreciated,

Rich

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