for statement list comprehension-like extention proposal

[Andrew Koenig]

Ryan> i thought id ask here before wirting a PEP, if people thought it
Ryan> would be a good enhancement to allow if clauses in regular
Ryan> for-statements like so:

>>>> for x in y if x < 10 :

Ryan> is semantically equivalent to

>>>> for x in [x for x in y if x < 10] :

Ryan> but is shorter and easier to read. basically, the if works as a
Ryan> filter for the values in the iterator. its not a major change,
Ryan> purely syntactic sugar.  and clearly backwards-compatible.

Ryan> seem reasonable?

Dunno -- is it really better than writing

        for x in y:
            if x < 10:

as is already possible?  If you could write it in one line, would
you ever do so?


-- 
Andrew Koenig, ark at acm.org