Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

It may seem weird, but a "membership operator" is a kind of "comparison 
operator".¹  They can even participate in chaining, 'a < b in s < c` is 
equivalent to `(a < b) and (b in s) and (b < c)`. 

I'm propose this new wording to mention the concept of "membership":

"The comparison operators `in` and `not in` are membership tests that determine 
whether a value is in (or not in) a container."

¹ https://docs.python.org/3/reference/expressions.html#comparisons

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<https://bugs.python.org/issue46270>
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