Chris Angelico wrote: > On Fri, Sep 19, 2014 at 8:59 PM, Steven D'Aprano > <steve+comp.lang.pyt...@pearwood.info> wrote: >> Here's a proof of concept of what would be allowed: [...] > Also, this can't possibly offer the same guarantee. Watch: > > d = MyDict(some_lot_of_items) > d.values(); d.items() > # mutate the dict in whatever way you like > pairs = zip(d.keys(), d.values()) > > This might well create mismatched pairs, because after generating the > keys() return value, the list gets shuffled, prior to generating > values() in the same expression. This would not be allowed.
That would be a bug, and an easy one to fix. Every mutation of the dict would have to reset the internal flags back to the starting state. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
