Nested List Question

[Chris McCoy]

Thank you!  I've been banging my head against the wall!

Chris M.

"Alex Martelli" <aleax at mail.comcast.net> wrote in message 
news:1h5f4t2.1yv785h120xalfN%aleax at mail.comcast.net...
> Newsfeeds <chris.mccoy at spirentcom.com> wrote:
>
>> Hello All,
>>
>>   Could anyone tell me why this code produces the output it does?
>   ...
>> gridSystemId = [[None]*columns]*rows
>
> You've made gridSystemID a list of `rows` references to the SAME "inner"
> list, so the behavior you observe is the only possible one.
>
> If you want copies instead, ASK for copies...:
>
> gridSystemId = [ [None]*columns for x in xrange(rows) ]
>
>
> Alex
> 



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