New submission from Владимир Тырин: This behavior seems to be very strange.
>>> l = [1, 2, 3] >>> t = ('a', l) >>> t ('a', [1, 2, 3]) >>> t[1] += [4] Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'tuple' object does not support item assignment >>> t ('a', [1, 2, 3, 4]) ---------- messages: 227451 nosy: Владимир.Тырин priority: normal severity: normal status: open title: Lists within tuples mutability issue type: behavior versions: Python 2.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue22481> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com