gh-115528: Update language reference for PEP 646 (GH-121181)
To recap: the objective is to make starred expressions valid in `subscription`,
which is used for generics: `Generic[...]`, `list[...]`, etc.
What _is_ gramatically valid in such contexts? Seemingly any of the following.
(At least, none of the following throw `SyntaxError` in a 3.12.3 REPL.)
Generic[x]
Generic[*x]
Generic[*x, y]
Generic[y, *x]
Generic[x := 1]
Generic[x := 1, y := 2]
So introducting
flexible_expression: expression | assignment_expression | starred_item
end then switching `subscription` to use `flexible_expression` sorts that.
But then we need to field `yield` - for which any of the following are
apparently valid:
yield x
yield x,
yield x, y
yield *x,
yield *x, *y
Introducing a separate `yield_list` is the simplest way I've been figure out to
do this - separating out the special case of `starred_item ,`.
(cherry picked from commit 7d3497f617)
Co-authored-by: Matthew Rahtz <matthew.rahtz@gmail.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
gh-114104: clarify asynchronous comprehension docs to match runtime behavior (GH-121175)
(cherry picked from commit 91313afdb3)
Co-authored-by: Danny Yang <yangdanny97@users.noreply.github.com>
doc: Mention the missing reflected special methods for all binary operations (GH-119931)
(cherry picked from commit bf5e1065f4)
Co-authored-by: Paulo Freitas <me@paulofreitas.me>
A 'single tuple' means 'one tuple, of whatever length.
Remove the unneeded and slightly distracting parenthetical 'singleton' comment.
(cherry picked from commit a1332a99cf)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
Augment the list of places where parentheses are
required around assignnment statements. In particular,
'a := 0' and 'a = b := 1' are syntax errors.
(cherry picked from commit 9a2f25d374)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
gh-110631: Fix reST indentation in `Doc/reference` (GH-110708)
Fix wrong indentation in the Doc/reference dir.
(cherry picked from commit 41d8ec5a1b)
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Replace the esoteric term 'datum' when describing dict comprehensions (GH-106119)
(cherry picked from commit 987b712b4a)
Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>
* Uncomment object removal in pairindextypes
* Use new-style index directive ('object') - C API
* Use new-style index directive ('object') - Library
* Use new-style index directive ('object') - Reference
* Use new-style index directive ('object') - Tutorial
* Add walrus operator to the index
* Add named expression to the index
Co-authored-by: Mariatta Wijaya <Mariatta@users.noreply.github.com>
* Fix indentation and add missing newline
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Co-authored-by: Mariatta Wijaya <Mariatta@users.noreply.github.com>
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Keep track of whether unsafe_tuple_compare() calls are resolved by the very
first tuple elements, and adjust strategy accordingly. This can significantly
cut the number of calls made to the full-blown PyObject_RichCompareBool(),
and especially when duplicates are rare.
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
Follow up to 7cdf30fff3 and 4173320920. This addresses the point "1. Update links in typing, subscription and union to point to GenericAlias." in the bpo for this PR.
