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[3.10] bpo-46270: Describe the in and not in operators as membership tests. (GH-30504) #30509

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rhettinger merged 1 commit into from
Jan 10, 2022
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[3.10] bpo-46270: Describe the in and not in operators as membership tests. (GH-30504) #30509

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10 changes: 6 additions & 4 deletions Doc/tutorial/datastructures.rst
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Expand Up @@ -659,10 +659,12 @@ More on Conditions
The conditions used in ``while`` and ``if`` statements can contain any
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
whether two objects are really the same object. All comparison operators have
the same priority, which is lower than that of all numerical operators.

The comparison operators ``in`` and ``not in`` are membership tests that
determine whether a value is in (or not in) a container. The operators ``is``
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
less than ``b`` and moreover ``b`` equals ``c``.
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