On 10 September 2013 13:00, Nick Coghlan <ncogh...@gmail.com> wrote: > Is this just syntactic sugar for recursive lookup of a transformed version > in __missing__? Or a way of supplying a custom "key" function to a > dictionary?
Not quite, because the dict should preserve the originally entered key. >>> td['FOO'] = 42 >>> td['bar'] = 1 >>> td['foo'] 42 >>> td['BAR'] 1 >>> list(td.keys()) ['FOO', 'bar'] This actually prompts the question, what should the following produce: >>> td['FOO'] = 42 >>> td['foo'] = 32 >>> list(td.keys()) ['FOO'] or ['foo']? Both answers are justifiable. Both are possibly even useful depending on context... Paul _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
