Michele Orrù added the comment: What do you mean by "does not preserve set identity"? Because I see:
$ ./python.exe Python 3.3.0rc2+ (default:178f9042af81+, Sep 24 2012, 18:54:31) [GCC 4.2.1 Compatible Apple Clang 2.1 (tags/Apple/clang-163.7.1)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> a = set(range(1)) [65967 refs] >>> b = set(range(20)) [65989 refs] >>> id(a) 4540421032 [65992 refs] >>> a -= b [65991 refs] >>> id(a) 4540421032 ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue8425> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com