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[3.6] bpo-18558: Clarify glossary entry for "Iterable" (GH-3732) (#3741)

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(cherry picked from commit 0bf287b6e0)
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Miss Islington (bot) 2017-09-25 00:57:24 -07:00 • committed by Raymond Hettinger
parent d38caf68bb
commit 01438ed4c2
2 changed files with 10 additions and 2 deletions
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5
Doc/glossary.rst
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@ -535,7 +535,10 @@ Glossary
iterables include all sequence types (such as :class:`list`, :class:`str`, iterables include all sequence types (such as :class:`list`, :class:`str`,
and :class:`tuple`) and some non-sequence types like :class:`dict`, and :class:`tuple`) and some non-sequence types like :class:`dict`,
:term:`file objects <file object>`, and objects of any classes you define :term:`file objects <file object>`, and objects of any classes you define
with an :meth:`__iter__` or :meth:`__getitem__` method. Iterables can be with an :meth:`__iter__` method or with a :meth:`__getitem__` method
that implements :term:`Sequence` semantics.
Iterables can be
used in a :keyword:`for` loop and in many other places where a sequence is used in a :keyword:`for` loop and in many other places where a sequence is
needed (:func:`zip`, :func:`map`, ...). When an iterable object is passed needed (:func:`zip`, :func:`map`, ...). When an iterable object is passed
as an argument to the built-in function :func:`iter`, it returns an as an argument to the built-in function :func:`iter`, it returns an

7
Doc/library/collections.abc.rst
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@ -107,7 +107,12 @@ ABC Inherits from Abstract Methods Mixin
.. class:: Iterable .. class:: Iterable
ABC for classes that provide the :meth:`__iter__` method. ABC for classes that provide the :meth:`__iter__` method.
See also the definition of :term:`iterable`.
Checking ``isinstance(obj, Iterable)`` detects classes that are registered
as :class:`Iterable` or that have an :meth:`__iter__` method, but it does
not detect classes that iterate with the :meth:`__getitem__` method.
The only reliable way to determine whether an object is :term:`iterable`
is to call ``iter(obj)``.
.. class:: Collection .. class:: Collection