[Python-ideas] More power in list comprehensions with the 'as' keyword

[Chris Rebert]

On Wed, Aug 27, 2008 at 4:17 PM, Terry Reedy <tjreedy at udel.edu> wrote:
>
>
> Tarek Ziadé wrote:
>
>>   [transform(e) as transformed for e in seq if some_test(transformed)]
>>
>> In my use case I would simply have to write;:
>>
>>  [l.strip() as stripped for l in text.split('\n') if stripped != '']
>>
>> Which seems to me clear and concise.
>
> -1 For me it is backward and confusing, whereas
>
> lines = []
> for l in test:
>  l = l.strip()
>  if l: lines.append(l)
>
> is clear as could be.
>
> To me, the drive to replace all for loops with list comps is mis-directed.
>  There is no end to the clauses people could propose to add: while, when,
> whatever, until, unless. mapped_to, transformed_by, and so on.  The result
> would soon by something quite different from Python as we know it.

Indeed, probably something approaching Common Lisp's overcomplicated
"loop" macro:
http://www.unixuser.org/~euske/doc/cl/loop.html

- Chris
========
Follow the path of the Iguana...
Rebertia: http://rebertia.com
Blog: http://blog.rebertia.com

>
> tjr
>
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