[Python-ideas] Re: `is in`/`not is in` operators

[Jeremiah Vivian]

It should make sense that if an operation is grammatically correct in a 
programming language, there's something wrong there. There could be alternative 
syntax,
> 'is `object` in `iterable`'
or
> 'is `object` not in `iterable`'
but I feel like there's some disadvantage to this alternative syntax.
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