> a = {} > a['a'] = a[a['a']] = 'b' {'a': 'b', 'b': 'b'} What the what? I would think that should KeyError, but it runs fine. Someone splain. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/chicago/attachments/20130401/0a4bda06/attachment.html>