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bpo-46270: Describe the in and not in operators as membership tests. (GH-30504)

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Raymond Hettinger 2022-01-09 20:02:06 -06:00 • committed by GitHub
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@ -659,10 +659,12 @@ More on Conditions
The conditions used in ``while`` and ``if`` statements can contain any The conditions used in ``while`` and ``if`` statements can contain any
operators, not just comparisons. operators, not just comparisons.
The comparison operators ``in`` and ``not in`` check whether a value occurs
(does not occur) in a sequence. The operators ``is`` and ``is not`` compare The comparison operators ``in`` and ``not in`` are membership tests that
whether two objects are really the same object. All comparison operators have determine whether a value is in (or not in) a container. The operators ``is``
the same priority, which is lower than that of all numerical operators. and ``is not`` compare whether two objects are really the same object. All
comparison operators have the same priority, which is lower than that of all
numerical operators.
Comparisons can be chained. For example, ``a < b == c`` tests whether ``a`` is Comparisons can be chained. For example, ``a < b == c`` tests whether ``a`` is
less than ``b`` and moreover ``b`` equals ``c``. less than ``b`` and moreover ``b`` equals ``c``.