On Sun, May 20, 2012 at 8:09 PM, Antoine Pitrou <solip...@pitrou.net> wrote: > On Sun, 20 May 2012 10:31:01 +0200 > nick.coghlan <python-check...@python.org> wrote: >> + >> + .. impl-detail:: >> + >> + CPython uses ``hash(id(x))`` as the default hash for class instances. > > This isn't true: > >>>> class C: pass > ... >>>> c = C() >>>> hash(c) > 619973 >>>> id(c) > 9919568 >>>> hash(id(c)) > 9919568 > id(...) always has the lower bits clear, so it was decided to shift it > to the right by a number of bits.
Ah, you're right - I misread my own experiment. Regardless, the hash(c) == id(c) that *was* there was also wrong. I'll just drop the implementation detail entirely and leave the new wording on its own. Cheers, Nick. -- Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
