[Python-ideas] fancy indexing (original) (raw)

Bruce Leban bruce at leapyear.org
Wed Jul 21 01:43:13 CEST 2010 

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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