Emanuele D'Arrigo wrote: > On Aug 27, 2:01 am, a...@pythoncraft.com (Aahz) wrote: >> Well, I'm not sure about exceptions, but you almost certainly won't get >> the results you want. > > What I'd like in this context is to iterate through the items in the > list without processing the same item twice and without skipping item > that are in front of the current iterator position. Somehow I can't > quite prove to myself if this is possible or not over multiple > threads. I.e. a dictionary will throw an exception about the object > changing size while iterating through it. A list doesn't, hence the > question.
This is not even possible in a single thread: >>> items = [1, 2, 3] >>> for i in items: ... print i ... if 1 in items: items.remove(1) ... 1 3 Basically a list iterator is just a list reference and an index into that list. No effort is made to keep track of added or removed items. Peter -- http://mail.python.org/mailman/listinfo/python-list
