On Sat, Jun 22, 2013 at 4:26 AM, Rick Johnson <rantingrickjohn...@gmail.com> wrote: > I could cast a "virtual net" over my poor lemmings before > they jump off the cliff by throwing an exception: > > Traceback (most recent screw-up last): > Line BLAH in SCRIPT > def f(x = [None, b, [a, [4]]]): > ArgumentError: No mutable default arguments allowed!
So tell me, oh Great and Powerful Wizard of Rick, how is the interpreter supposed to know which defaults are mutable? I mean, it's obviously some intrinsic property of the object. Somehow one thing is clearly immutable, another thing clearly isn't. Will there be a PyObject_IsImmutable() API? Oh! I know. Function argument defaults will now be restricted to int/float/tuple. That would do it, right? Nobody would be bothered by little restrictions like that, would they. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
