New submission from Anthony Sottile <asott...@umich.edu>:
This is a regression from python2.x behaviour: $ python2 Python 2.7.15rc1 (default, Nov 12 2018, 14:31:15) [GCC 7.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> x = set() >>> x.difference(123) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'int' object is not iterable $ python3.8 Python 3.8.0b1 (default, Jun 6 2019, 03:44:52) [GCC 7.4.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> x = set() >>> x.difference(123) set() The regression appears to be introduced in this patch: 4103e4dfbce https://github.com/python/cpython/commit/4103e4dfbce ---------- components: Library (Lib) messages: 345147 nosy: Anthony Sottile, rhettinger priority: normal severity: normal status: open title: empty set difference does not check types of values versions: Python 3.7, Python 3.8, Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue37219> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
