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Odd truth result with in and ==

21.11.18 22:17, Cameron Simpson ????:
> Can someone show me a real world, or failing that - sane looking, 
> chained comparison using "in"?

     s[0] == s[-1] in '\'"'

Tests that string s starts and ends with a single or double quote.

It can be also used with sets:

     elem in set1 <= set2