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[3.8] bpo-25866: Minor cleanups to "sequence" in docs (GH-17177) #17208

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Nov 17, 2019
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[3.8] bpo-25866: Minor cleanups to "sequence" in docs (GH-17177) #17208

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14 changes: 9 additions & 5 deletions Doc/reference/datamodel.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1566,7 +1566,7 @@ not found on a module object through the normal lookup, i.e.
the module ``__dict__`` before raising an :exc:`AttributeError`. If found,
it is called with the attribute name and the result is returned.

The ``__dir__`` function should accept no arguments, and return a list of
The ``__dir__`` function should accept no arguments, and return a sequence of
strings that represents the names accessible on module. If present, this
function overrides the standard :func:`dir` search on a module.

Expand Down Expand Up @@ -1797,6 +1797,10 @@ Notes on using *__slots__*
(the other bases must have empty slot layouts) - violations raise
:exc:`TypeError`.

* If an iterator is used for *__slots__* then a descriptor is created for each
of the iterator's values. However, the *__slots__* attribute will be an empty
iterator.

.. _class-customization:

Customizing class creation
Expand Down Expand Up @@ -2128,8 +2132,8 @@ operators. It is recommended that both mappings and sequences implement the
mappings, ``in`` should search the mapping's keys; for sequences, it should
search through the values. It is further recommended that both mappings and
sequences implement the :meth:`__iter__` method to allow efficient iteration
through the container; for mappings, :meth:`__iter__` should be the same as
:meth:`keys`; for sequences, it should iterate through the values.
through the container; for mappings, :meth:`__iter__` should iterate
through the object's keys; for sequences, it should iterate through the values.

.. method:: object.__len__(self)

Expand Down Expand Up @@ -2243,9 +2247,9 @@ through the container; for mappings, :meth:`__iter__` should be the same as


The membership test operators (:keyword:`in` and :keyword:`not in`) are normally
implemented as an iteration through a sequence. However, container objects can
implemented as an iteration through a container. However, container objects can
supply the following special method with a more efficient implementation, which
also does not require the object be a sequence.
also does not require the object be iterable.

.. method:: object.__contains__(self, item)

Expand Down