[Tutor] list issue.. i think

[Rich Lovely]

On 23 December 2011 02:11, bruce <badouglas at gmail.com> wrote:
> hi.
>
> got a test where i have multiple lists with key/values. trying to figure out
> how to do a join/multiply, or whatever python calls it, where i have a
> series of resulting lists/dicts that look like the following..
>
> the number of lists/rows is dynamic..
> the size of the list/rows will also be dynamic as well.
>
> i've looked over the py docs, as well as different potential solns..
>
> psuedo code, or pointers would be helpful.
>
> thanks...
>
> test data
> a['a1']=['a1','a2','a3']
> a['a2']=['b1','b2','b3']
> a['a3']=['c1','c2','c3']
>
> end test result::
> a1:a1,a2:b1,a3:c1
> a1:a2,a2:b1,a3:c1
> a1:a3,a2:b1,a3:c1
>
> a1:a1,a2:b2,a3:c1
> a1:a2,a2:b2,a3:c1
> a1:a3,a2:b2,a3:c1
>
> a1:a1,a2:b3,a3:c1
> a1:a2,a2:b3,a3:c1
> a1:a3,a2:b3,a3:c1
>
> a1:a1,a2:b1,a3:c2
> a1:a2,a2:b1,a3:c2
> a1:a3,a2:b1,a3:c2
>
> a1:a1,a2:b2,a3:c2
> a1:a2,a2:b2,a3:c2
> a1:a3,a2:b2,a3:c2
>
> a1:a1,a2:b3,a3:c2
> a1:a2,a2:b3,a3:c2
> a1:a3,a2:b3,a3:c2
>
> a1:a1,a2:b1,a3:c3
> a1:a2,a2:b1,a3:c3
> a1:a3,a2:b1,a3:c3
>
> a1:a1,a2:b2,a3:c3
> a1:a2,a2:b2,a3:c3
> a1:a3,a2:b2,a3:c3
>
> a1:a1,a2:b3,a3:c3
> a1:a2,a2:b3,a3:c3
> a1:a3,a2:b3,a3:c3
>
>
>
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I think you want to take a look at the itertools module
(http://docs.python.org/library/itertools.html), probably
itertools.product, although I can't see exactly what you want as a
final result.
The process will be something like:

turn a into list of lists of key:value pairs
call itertools.product() using star notation
(http://docs.python.org/tutorial/controlflow.html#unpacking-argument-lists)
to turn the list into sequential arguments
-- 
Rich "Roadie Rich" Lovely

Just because you CAN do something, doesn't necessarily mean you SHOULD.
In fact, more often than not, you probably SHOULDN'T.  Especially if I
suggested it.

10 re-discover BASIC
20 ???
30 PRINT "Profit"
40 GOTO 10