[Python-ideas] list / array comprehensions extension

[Michael Foord]

On 15 December 2011 17:41, Alexander Heger <python at 2sn.net> wrote:

> Dear Oleg,
>
> OK, these work for the examples I listed, I had not tried that. Thanks!
>
> I still think the element extraction would be nice, though.
> what does not work your way is
> x = [1,2,3]
> y = (0,) + x
>
> but
> y = (0,*x)
> could do ... ?
>


In fact there's already an issue for this, with patch:

http://bugs.python.org/issue2292

Actually it goes a lot further than just the syntax you suggest... It
extends tuple unpacking into a few more places as well.

All the best,

Michael Foord


>
> -Alexander
>
>
> On 12/15/2011 11:33 AM, Oleg Broytman wrote:
>
>> On Thu, Dec 15, 2011 at 10:26:50AM -0600, Alexander Heger wrote:
>>
>>> x = [1,2,3]
>>> y = [0,*x]
>>> to obtain [0,1,2,3]
>>>
>>
>> y = [0] + x
>>
>>  or similar for lists
>>> x = (1,2,3)
>>> y = (0,*x)
>>> to obtain (0,1,2,3)
>>>
>>
>> y = (0,) + x
>>
>> Oleg.
>>
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