[Python-Dev] for loop with if filter (original) (raw)

Terry Reedy tjreedy at udel.edu
Sat Nov 17 00:31:12 CET 2007

"Gustavo Carneiro" <gjcarneiro at gmail.com> wrote in message news:a467ca4f0711160617p11564c05q8b2c59e87981c028 at mail.gmail.com... |I am finding myself often doing for loops over a subset of a list, like: || for r in results: | if r.numNodes != numNodes: | continue | # do something with r

Why write it backwards?

for r in results: if r.numNodes == numNodes # do something with r

is the direct parallel with the below code.

| It would be nice if the plain for loop was as flexible as list | comprehensions and allowed an optional if clause, like this: || for r in results if r.numNodes == numNodes: | # do something with r

Same as above with ':\n' deleted. A trivial difference. An optional if clause is less flexible than an optional if statement and block.

| Has this idea come up before? Does anyone else like this idea?

Yes, and Guido rejected at that time.

tjr

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