Re: [Python-ideas] for-loop-if like list comps have?
On 03/30/2014 05:44 AM, Liam Marsh wrote:
hello, is it possible to accept this syntax? it is about the same subject, but an other proposition... so, here it is:
for x in xs , y in ys: ... � �***instructions*** thank you!
I think you meant to send this to the list, instead of my personal email. I use thunderbird and news.gmane.org to send things to python-ideas, but I think you can just send a mail to: Python-ideas@python.org with 'Re: <the original subject line>' such as: Re: [Python-ideas] for-loop-if like list comps have? -- Christopher Welborn (cj) cjwelborn at live.com http://welbornprod.com
From: Christopher Welborn
On 03/30/2014 05:44 AM, Liam Marsh wrote:
hello, is it possible to accept this syntax? it is about the same subject, but an other proposition... so, here it is:
>>>for x in xs , y in ys: ... � �***instructions*** thank you!
(This is obviously a reply to Liam, not Christopher.) It's not clear which of these you want that to mean: for x, y in zip(xs, ys): do_stuff(x, y) for x, y in product(xs, ys): do_stuff(x, y) And the existing versions are already pretty clear and readable. In a listcomp, it's often clearer to use two for clauses than product… but usually in that case you write them on separate lines, and in a statement, it would be even clearer to use nested statements. Compare this somewhat realistic use case: transformed_values = (long expression with value and sublist for sublist in long_function_that_returns_a_list(various, arguments) for value in sublist) for sublist in long_function_that_returns_a_list(various, arguments): for value in sublist: yield long expression with value and sublist Would you really want to write the second one on one line, even if you could? for sublist in long_function_that_returns_a_list(various, arguments), value in sublist: yield long expression with value and sublist
participants (2)
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Andrew Barnert -
Christopher Welborn