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| author | Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> | 2021-05-04 11:36:50 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-05-04 11:36:50 (GMT) |
| commit | ae4f8574993c85f9dc6fe60e6a25d65f688705e6 (patch) | |
| tree | 4cf3ded9a3dfee3ee41d7d3d48e85123eaf3f59f /Doc/reference | |
| parent | aa0ce1615f48742591535579d81c0ada1083a33e (diff) | |
| download | cpython-ae4f8574993c85f9dc6fe60e6a25d65f688705e6.zip cpython-ae4f8574993c85f9dc6fe60e6a25d65f688705e6.tar.gz cpython-ae4f8574993c85f9dc6fe60e6a25d65f688705e6.tar.bz2 | |
bpo-44025: Clarify when '_' is a keyword. (GH-25873)
In match statements, in case patterns and nowhere else.
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
(cherry picked from commit 3b200b2aa648fcc8a2673871807c1463afe00195)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
Diffstat (limited to 'Doc/reference')
| -rw-r--r-- | Doc/reference/compound_stmts.rst | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Doc/reference/compound_stmts.rst b/Doc/reference/compound_stmts.rst index 96bd9b0..77400a8 100644 --- a/Doc/reference/compound_stmts.rst +++ b/Doc/reference/compound_stmts.rst @@ -797,7 +797,7 @@ Syntax: capture_pattern: !'_' NAME A single underscore ``_`` is not a capture pattern (this is what ``!'_'`` -expresses). And is instead treated as a :token:`wildcard_pattern`. +expresses). It is instead treated as a :token:`wildcard_pattern`. In a given pattern, a given name can only be bound once. E.g. ``case x, x: ...`` is invalid while ``case [x] | x: ...`` is allowed. @@ -820,7 +820,9 @@ and binds no name. Syntax: .. productionlist:: python-grammar wildcard_pattern: '_' -``_`` is a :ref:`soft keyword <soft-keywords>`. +``_`` is a :ref:`soft keyword <soft-keywords>` within any pattern, +but only within patterns. It is an identifier, as usual, even within +``match`` headers, ``guards``, and ``case`` blocks. In simple terms, ``_`` will always succeed. |