Chris Angelico <ros...@gmail.com>: > On Wed, Aug 9, 2017 at 7:51 PM, Marko Rauhamaa <ma...@pacujo.net> wrote: >> Mutable objects can be used as keys into a dictionary. > > Only when the objects' mutability does not affect their values.
Up to equality. The objects can carry all kinds of mutable payload as long as __hash__() and __eq__() don't change with it. And Python doesn't enforce this in any way except for lists. That's somewhat unfortunate since sometimes you really would like an immutable (or rather, no-longer-mutable) list to act as a key. Marko -- https://mail.python.org/mailman/listinfo/python-list
