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bpo-46033: Clarify for-statement execution #30025

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Merged
merged 7 commits into from
Apr 3, 2022
Merged

bpo-46033: Clarify for-statement execution #30025

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2e92aad
Remove duplicated sentence from for statement docs
michcio1234 Dec 10, 2021
8b5eb99
Add news entry
michcio1234 Jan 3, 2022
a83fbcb
Merge branch 'main' into fix-issue-46033-for-statement-docs
terryjreedy Apr 2, 2022
8c6856b
Update 2022-01-03-18-50-39.bpo-46033.7WeF0f.rst
terryjreedy Apr 2, 2022
46037d1
Update Doc/reference/compound_stmts.rst
terryjreedy Apr 2, 2022
0fd36f8
Update Doc/reference/compound_stmts.rst
terryjreedy Apr 2, 2022
e2742b0
Incorporate remaining suggestions.
terryjreedy Apr 3, 2022
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Merge branch 'main' into fix-issue-46033-for-statement-docs
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@terryjreedy
terryjreedy authored Apr 2, 2022
commit a83fbcb46b51e20e44d39d67c48467ee4f61d5cb
8 changes: 5 additions & 3 deletions Doc/reference/compound_stmts.rst
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Expand Up @@ -157,9 +157,11 @@ The :keyword:`for` statement is used to iterate over the elements of a sequence
for_stmt: "for" `target_list` "in" `starred_list` ":" `suite`
: ["else" ":" `suite`]

The expression list is evaluated once; it should yield an iterable object. An
iterator is created for the result of the ``expression_list``. First item
provided by the iterator is then assigned to the target list using the standard
The starred list expression is evaluated once; it should yield an iterable object.
If the expression is a sequence, it can contain starred elements (``*x, *y``)
that will be unpacked, as when constructing a ``tuple`` or ``list`` literal.
An iterator is created for the resulting iterable. The first item provided
by the iterator is then assigned to the target list using the standard
rules for assignments (see :ref:`assignment`), and the suite is executed - this
repeats for each item provided by the iterator. When the items are exhausted
(which is immediately when the sequence is empty or an iterator raises
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