Raymond Hettinger added the comment:
Python core containers support the invariant:
assert all(x in c for x in c)
See also:
http://bertrandmeyer.com/2010/02/06/reflexivity-and-other-pillars-of-civilization/
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assignee: -> rhettinger
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21873>
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