[Python-ideas] fancy indexing

[Bruce Leban]

    x = a[[y]]
would be approximately equivalent to
    x = [a[i] for i in y]
and
    a[[x]] = y
would be approximately equivalent to
    for (i,j) in zip(x,y): a[i] = j
except that zip throws away excess values in the longer sequence and I think
[[..]] would throw an exception.

--- Bruce
http://www.vroospeak.com
http://google-gruyere.appspot.com



On Tue, Jul 20, 2010 at 3:51 PM, Mathias Panzenböck <
grosser.meister.morti at gmx.net> wrote:

> I'm not sure what this is about but do you mean something like this?
> >>> l=[1,2,3,4]
> >>> l[1:2] = ['a','b']
> >>> l
> [1, 'a', 'b', 3, 4]
>
>
> On 07/20/2010 09:17 PM, Bruce Leban wrote:
>
>> [changing the subject; was: 'where' statement in Python?]
>>
>> I think this is an interesting idea (whether worth adding is a different
>> question). I think it would
>> be confusing that
>>    a[x] = (y,z)
>> does something entirely different when x is 1 or (1,2). If python *were*
>> to add something like this,
>> I think perhaps a different syntax should be considered:
>>
>> a[[x]] = y
>> y = a[[x]]
>>
>> which call __setitems__ and __getitems__ respectively. This makes it clear
>> that something different
>> is going on and eliminates the ambiguity for dicts.
>>
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