On Thu, 29 Mar 2007 04:49:17 +0000, Dennis Lee Bieber wrote: > On 28 Mar 2007 18:16:31 -0700, [EMAIL PROTECTED] declaimed the > following in comp.lang.python: > > >> what do you mean by create new object when using list comprehensoin or >> list()? Does using slicing create a new object as well? > > If the destination is a bare name, YES. > > If the destination is a slice of a list, then one is merely > replacing the contents in that slice, but leaving the other parts of the > list in place.
Maybe so, but the slice doesn't know where it is being assigned to. It still has to generate a new list object, which is then stored in the appropriate part of the left-hand list object. I suppose a sufficiently clever optimizing compiler might not do it that way, but looking at some code with dis.dis() I'm pretty sure Python does create the new list first. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
