understanding list scope

[Tino Wildenhain]

Hi,


Alex wrote:
> Hi all!
> 
> I have a problem understanding the behaviour of this snippet:
> 
> data_set = ({"param":"a"},{"param":"b"},{"param":"c"})
> 
> for i in range(len(data_set)):
>     ds = data_set[:]
>     data = ds[i]
>     if i == 1: data['param'] = "y"
>     if i == 2: data['param'] = "x"

> 
> print data_set

Beside the data copy which is explained in the other posts,
what is the problem you want to solve? Would

data_set[1]['param']="x"
data_set[2]['param']="y"

not doing the same?

or more to your point:

ds=data_set[:1]+[dict(param="x"),dict(param="y")]+data_set[2:]

HTH
Tino
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