24.01.20 13:57, Chris Angelico пише:
Are there any non-container uses where this comes up? Can the rule be
codified simply as that container membership, in all core/stdlib
types, is defined by "x is y or x == y"?

Also a membership test for iterators (which is already explicitly documented).

   >>> math.nan in (math.nan for i in [1])
   True
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