Raymond Hettinger added the comment: I like the idea of adding a mapping example but don't want to encourage use of defaultdict in contexts like this one. A defaultdict usefully specifies a default but has the unpleasant side-effect of altering the dictionary (adding new keys) during the look-up phase. This has bitten a lot of people (including famous ones like Peter Norvig).
---------- nosy: +rhettinger _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue28612> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
