[portland] Still Having List/Tuple Problems

[Rich Shepard]

On Wed, 16 Apr 2008, kirby urner wrote:

> You could use list comprensions:

>>>> astuff = [j for (i,j) in mydata if i == 'A']

Kirby,

   I thought of trying this, but I want to make it general rather than
explicit ...

> If you don't know what all the keys are gonna be you could build a list of
> unique ones:

   ... as you show here.

>>>> thekeys = set([i for (i,j) in mydata])
>
>>>> thekeys
> set(['A', 'C', 'B'])
>
>>>> for thekey in thekeys:
> 	print thekey
> 	print [j for (i,j) in mydata if i == thekey]

   I need to read and learn about sets in python.

   Now I have two approaches as solutions when I again run into the same
need.

Thank you very much,

Rich

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