On 04/27/10 12:19, Dave Angel wrote: > Note also that if you insert or delete from the list while you're > looping, you can get undefined results. That's one reason it's common > to build a new loop, and just assign it back when done. Example would > be the list comprehension you showed earlier.
I have to add to Dave's statement, if you "modify the list's content" while looping there is no undefined behavior; you get undefined behavior if you "modify the list's structure". Operations that modify a list's structure includes insertion, delete, append, etc; those operations which can modify the len() of list. Modifying the content, however, is perfectly safe. However, even when just modifying list's content, I personally still prefer list/generator comprehension. They're fast and simple. _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
