Streamline documentation style (redis#3232)

Adopt the Google docstrings style as the preferred way to document code.
Update one of the existing docstrings to the new format, to showcase how
it would look like.

Enable the `napoleon` preprocessor in Sphinx, to be able to process
Google style docstrings.

Take the opportunity to make the copyright year dynamic, so we don't
have to manually keep it up to date.

Add a section about documentation to the contributors guide.

---------

Co-authored-by: Gabriel Erzse <[email protected]>

Author: gerzse

.github/wordlist.txt

@@ -74,6 +74,8 @@ bysource
 charset
 del
 dev
+docstring
+docstrings
 eg
 exc
 firsttimersonly

CONTRIBUTING.md

@@ -81,6 +81,19 @@ using `invoke standalone-tests`; similarly, RedisCluster tests can be run by usi
 Each run of tests starts and stops the various dockers required. Sometimes
 things get stuck, an `invoke clean` can help.
 
+## Documentation
+
+If relevant, update the code documentation, via docstrings, or in `/docs`.
+
+You can check how the documentation looks locally by running `invoke build-docs`
+and loading the generated HTML files in a browser.
+
+Historically there is a mix of styles in the docstrings, but the preferred way
+of documenting code is by applying the
+[Google style](https://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html).
+Type hints should be added according to PEP484, and should not be repeated in
+the docstrings.
+
 ### Docker Tips
 
 Following are a few tips that can help you work with the Docker-based

docs/conf.py

@@ -10,6 +10,7 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
+import datetime
 import os
 import sys
 
@@ -30,19 +31,23 @@
     "nbsphinx",
     "sphinx_gallery.load_style",
     "sphinx.ext.autodoc",
-    "sphinx_autodoc_typehints",
-    "sphinx.ext.doctest",
     "sphinx.ext.viewcode",
     "sphinx.ext.autosectionlabel",
+    "sphinx.ext.napoleon",
 ]
 
+# Napoleon settings. We only accept Google-style docstrings.
+napoleon_google_docstring = True
+napoleon_numpy_docstring = False
+
 # AutosectionLabel settings.
 # Uses a <page>:<label> schema which doesn't work for duplicate sub-section
 # labels, so set max depth.
 autosectionlabel_prefix_document = True
 autosectionlabel_maxdepth = 2
 
 # AutodocTypehints settings.
+autodoc_typehints = 'description'
 always_document_param_types = True
 typehints_defaults = "comma"
 
@@ -60,7 +65,8 @@
 
 # General information about the project.
 project = "redis-py"
-copyright = "2023, Redis Inc"
+current_year = datetime.datetime.now().year
+copyright = f"{current_year}, Redis Inc"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the

redis/commands/core.py

@@ -199,69 +199,58 @@ def acl_setuser(
         """
         Create or update an ACL user.
 
-        Create or update the ACL for ``username``. If the user already exists,
+        Create or update the ACL for `username`. If the user already exists,
         the existing ACL is completely overwritten and replaced with the
         specified values.
 
-        ``enabled`` is a boolean indicating whether the user should be allowed
-        to authenticate or not. Defaults to ``False``.
-
-        ``nopass`` is a boolean indicating whether the can authenticate without
-        a password. This cannot be True if ``passwords`` are also specified.
-
-        ``passwords`` if specified is a list of plain text passwords
-        to add to or remove from the user. Each password must be prefixed with
-        a '+' to add or a '-' to remove. For convenience, the value of
-        ``passwords`` can be a simple prefixed string when adding or
-        removing a single password.
-
-        ``hashed_passwords`` if specified is a list of SHA-256 hashed passwords
-        to add to or remove from the user. Each hashed password must be
-        prefixed with a '+' to add or a '-' to remove. For convenience,
-        the value of ``hashed_passwords`` can be a simple prefixed string when
-        adding or removing a single password.
-
-        ``categories`` if specified is a list of strings representing category
-        permissions. Each string must be prefixed with either a '+' to add the
-        category permission or a '-' to remove the category permission.
-
-        ``commands`` if specified is a list of strings representing command
-        permissions. Each string must be prefixed with either a '+' to add the
-        command permission or a '-' to remove the command permission.
-
-        ``keys`` if specified is a list of key patterns to grant the user
-        access to. Keys patterns allow '*' to support wildcard matching. For
-        example, '*' grants access to all keys while 'cache:*' grants access
-        to all keys that are prefixed with 'cache:'. ``keys`` should not be
-        prefixed with a '~'.
-
-        ``reset`` is a boolean indicating whether the user should be fully
-        reset prior to applying the new ACL. Setting this to True will
-        remove all existing passwords, flags and privileges from the user and
-        then apply the specified rules. If this is False, the user's existing
-        passwords, flags and privileges will be kept and any new specified
-        rules will be applied on top.
-
-        ``reset_keys`` is a boolean indicating whether the user's key
-        permissions should be reset prior to applying any new key permissions
-        specified in ``keys``. If this is False, the user's existing
-        key permissions will be kept and any new specified key permissions
-        will be applied on top.
-
-        ``reset_channels`` is a boolean indicating whether the user's channel
-        permissions should be reset prior to applying any new channel permissions
-        specified in ``channels``.If this is False, the user's existing
-        channel permissions will be kept and any new specified channel permissions
-        will be applied on top.
-
-        ``reset_passwords`` is a boolean indicating whether to remove all
-        existing passwords and the 'nopass' flag from the user prior to
-        applying any new passwords specified in 'passwords' or
-        'hashed_passwords'. If this is False, the user's existing passwords
-        and 'nopass' status will be kept and any new specified passwords
-        or hashed_passwords will be applied on top.
-
-        For more information see https://redis.io/commands/acl-setuser
+        For more information, see https://redis.io/commands/acl-setuser
+
+        Args:
+            username: The name of the user whose ACL is to be created or updated.
+            enabled: Indicates whether the user should be allowed to authenticate.
+                     Defaults to `False`.
+            nopass: Indicates whether the user can authenticate without a password.
+                    This cannot be `True` if `passwords` are also specified.
+            passwords: A list of plain text passwords to add to or remove from the user.
+                       Each password must be prefixed with a '+' to add or a '-' to
+                       remove. For convenience, a single prefixed string can be used
+                       when adding or removing a single password.
+            hashed_passwords: A list of SHA-256 hashed passwords to add to or remove
+                              from the user. Each hashed password must be prefixed with
+                              a '+' to add or a '-' to remove. For convenience, a single
+                              prefixed string can be used when adding or removing a
+                              single password.
+            categories: A list of strings representing category permissions. Each string
+                        must be prefixed with either a '+' to add the category
+                        permission or a '-' to remove the category permission.
+            commands: A list of strings representing command permissions. Each string
+                      must be prefixed with either a '+' to add the command permission
+                      or a '-' to remove the command permission.
+            keys: A list of key patterns to grant the user access to. Key patterns allow
+                  '*' to support wildcard matching. For example, '*' grants access to
+                  all keys while 'cache:*' grants access to all keys that are prefixed
+                  with 'cache:'. `keys` should not be prefixed with a '~'.
+            reset: Indicates whether the user should be fully reset prior to applying
+                   the new ACL. Setting this to `True` will remove all existing
+                   passwords, flags, and privileges from the user and then apply the
+                   specified rules. If `False`, the user's existing passwords, flags,
+                   and privileges will be kept and any new specified rules will be
+                   applied on top.
+            reset_keys: Indicates whether the user's key permissions should be reset
+                        prior to applying any new key permissions specified in `keys`.
+                        If `False`, the user's existing key permissions will be kept and
+                        any new specified key permissions will be applied on top.
+            reset_channels: Indicates whether the user's channel permissions should be
+                            reset prior to applying any new channel permissions
+                            specified in `channels`. If `False`, the user's existing
+                            channel permissions will be kept and any new specified
+                            channel permissions will be applied on top.
+            reset_passwords: Indicates whether to remove all existing passwords and the
+                             `nopass` flag from the user prior to applying any new
+                             passwords specified in `passwords` or `hashed_passwords`.
+                             If `False`, the user's existing passwords and `nopass`
+                             status will be kept and any new specified passwords or
+                             hashed passwords will be applied on top.
         """
         encoder = self.get_encoder()
         pieces: List[EncodableT] = [username]