On Thu, Apr 26, 2012 at 3:51 PM, Chris Angelico <ros...@gmail.com> wrote: > On Fri, Apr 27, 2012 at 7:39 AM, Ian Kelly <ian.g.ke...@gmail.com> wrote: >> I'm not sure precisely what you mean by "temporary object", so I am >> taking it to mean an object that is referenced only by the VM stack >> (or something equivalent for other implementations). >> >> In that case: no, you can't. Take "f() is g()", where the code >> objects of f and g are supplied at runtime. Are the objects returned >> by either of those expressions "temporary"? Without being able to do >> static analysis of the code of f and g, there is no way to know. > > The expression itself will have references to all its operands (at > least conceptually).
Yes, the references on the VM stack. > If their refcounts are precisely 1, then the > objects are temporaries and will be disposable as soon as the > expression's fully evaluated. You can't check ref counts at parse time. -- http://mail.python.org/mailman/listinfo/python-list
