The following patch adds the ability for: for in if : to the Python core. This unifies the syntax of list/generator comprehensions and the for statement somewhat, because both now accept conditions which produce an immediate continue. I've posted a PEP to python-dev, which details the changes this patch makes (which are all backwards-compatible). The patch doesn't try to address more than the actual code required to make this feature work yet (except for changes to Modules/parsermodule.c and Doc/ref/ref7.tex, which details the for statement). If there's consensus on this feature, I'll gladly produce more documentation.
Logged In: YES user_id=764593 I'm not loving the interaction with conditional expressions. for x in (1,2,3) if test else (3,2,1): I suppose this techically isn't ambiguous because else is a keyword. On the other hand, you could do it now using he if-else for x in real_seq if test else ():
Logged In: YES user_id=764593 It seems I misread what the intent was -- I was thinking of the if as guarding the entire for loop, not just a single iteration. Because of this confusion, I have to be -1. Is there a reason you can't just wrap your iterable sequence with another iterator? for x in (candidate for candidate in fullseq if test):
Logged In: YES user_id=791932 Sure, you can wrap the iterable, or you can even do: if x in y: if not x: continue ... or if x in y: if x: ... without using any form of "iterator magic". Read my PEP-xxx on py-dev, and my explanation there of why I think this is a "good thing"(TM), but I won't go explain it here again, because generally people have told be to drop it.
