Tim Peters <t...@python.org> added the comment:

Orion, you're using the interface as intended :-)

While it's too late to change now, if Python started over from scratch I'd 
argue to leave "in" and "not in" out of this feature - chaining them is 
_usually_ an unintended behavior.

Then again, sometimes it is slightly useful.  For example, if I want to know if 
`n` is in a set of primes, but isn't even,

if 2 != n in some_set_of_primes:

does the job succinctly.  But not really "Pythonically", since even experienced 
Python programmers may scratch their heads when reading it :-(

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39746>
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