Make docstrings more readable by switching to Napoleon

.github/CONTRIBUTING.md

@@ -121,16 +121,20 @@ But it's way more comfortable to run it locally and catch avoidable errors befor
 ## Code
 
 - Obey [PEP 8](https://www.python.org/dev/peps/pep-0008/) and [PEP 257](https://www.python.org/dev/peps/pep-0257/).
-  We use the `"""`-on-separate-lines style for docstrings:
+  We use the `"""`-on-separate-lines style for docstrings with [Napoleon](https://www.sphinx-doc.org/en/master/usage/extensions/napoleon.html)-style API documentation:
 
   ```python
   def func(x: str) -> str:
       """
       Do something.
 
-      :param str x: A very important parameter.
+      Arguments:
 
-      :rtype: str
+        x: A very important parameter.
+
+      Returns:
+
+        A very important return value.
       """
   ```
 - If you add or change public APIs, tag the docstring using `..  versionadded:: 16.0.0 WHAT` or `..  versionchanged:: 16.2.0 WHAT`.

docs/api.rst

@@ -292,6 +292,7 @@ API Reference
    :members: bind, unbind, try_unbind, new, debug, info, warning, warn, error, critical, exception, log, adebug, ainfo, awarning, aerror, acritical, aexception, alog
 
 .. autoclass:: AsyncBoundLogger
+   :members: sync_bl
 
 .. autoclass:: LoggerFactory
    :members: __call__

src/structlog/_base.py

@@ -78,7 +78,9 @@ def unbind(self, *keys: str) -> BoundLoggerBase:
         """
         Return a new logger with *keys* removed from the context.
 
-        :raises KeyError: If the key is not part of the context.
+        Raises:
+
+            KeyError: If the key is not part of the context.
         """
         bl = self.bind()
         for key in keys:
@@ -121,19 +123,29 @@ def _process_event(
         Call it to combine your *event* and *context* into an event_dict and
         process using the processor chain.
 
-        :param method_name: The name of the logger method.  Is passed into
-            the processors.
-        :param event: The event -- usually the first positional argument to a
-            logger.
-        :param event_kw: Additional event keywords.  For example if someone
-            calls ``log.info("foo", bar=42)``, *event* would to be ``"foo"``
-            and *event_kw* ``{"bar": 42}``.
+        Arguments:
+
+            method_name:
+                The name of the logger method.  Is passed into the processors.
+
+            event:
+                The event -- usually the first positional argument to a logger.
+
+            event_kw:
+                Additional event keywords.  For example if someone calls
+                ``log.info("foo", bar=42)``, *event* would to be ``"foo"`` and
+                *event_kw* ``{"bar": 42}``.
+
+        Raises:
+
+            structlog.DropEvent: if log entry should be dropped.
 
-        :raises: `structlog.DropEvent` if log entry should be dropped.
-        :raises: `ValueError` if the final processor doesn't return a
-            str, bytes, bytearray, tuple, or a dict.
+            ValueError:
+                if the final processor doesn't return a str, bytes, bytearray,
+                tuple, or a dict.
 
-        :returns: `tuple` of ``(*args, **kw)``
+        Returns:
+             `tuple` of ``(*args, **kw)``
 
         .. note::
 
@@ -169,7 +181,10 @@ def _process_event(
         if isinstance(event_dict, dict):
             return (), event_dict
 
-        msg = "Last processor didn't return an appropriate value.  Valid return values are a dict, a tuple of (args, kwargs), bytes, or a str."
+        msg = (
+            "Last processor didn't return an appropriate value.  "
+            "Valid return values are a dict, a tuple of (args, kwargs), bytes, or a str."
+        )
         raise ValueError(msg)
 
     def _proxy_to_logger(
@@ -182,14 +197,20 @@ def _proxy_to_logger(
         handling :exc:`structlog.DropEvent`, and finally calls *method_name* on
         :attr:`_logger` with the result.
 
-        :param method_name: The name of the method that's going to get
-            called.  Technically it should be identical to the method the
-            user called because it also get passed into processors.
-        :param event: The event -- usually the first positional argument to a
-            logger.
-        :param event_kw: Additional event keywords.  For example if someone
-            calls ``log.info("foo", bar=42)``, *event* would to be ``"foo"``
-            and *event_kw* ``{"bar": 42}``.
+        Arguments:
+
+            method_name:
+                The name of the method that's going to get called.  Technically
+                it should be identical to the method the user called because it
+                also get passed into processors.
+
+            event:
+                The event -- usually the first positional argument to a logger.
+
+            event_kw:
+                Additional event keywords.  For example if someone calls
+                ``log.info("foo", bar=42)``, *event* would to be ``"foo"`` and
+                *event_kw* ``{"bar": 42}``.
 
         .. note::
 
@@ -211,12 +232,15 @@ def get_context(bound_logger: BindableLogger) -> Context:
     The type of *bound_logger* and the type returned depend on your
     configuration.
 
-    :param bound_logger: The bound logger whose context you want.
+    Arguments:
+
+        bound_logger: The bound logger whose context you want.
+
+    Returns:
 
-    :returns: The *actual* context from *bound_logger*. It is *not* copied
-        first.
+        The *actual* context from *bound_logger*. It is *not* copied first.
 
-    .. versionadded:: 20.2
+    .. versionadded:: 20.2.0
     """
     # This probably will get more complicated in the future.
     return bound_logger._context

src/structlog/_config.py

@@ -81,7 +81,7 @@ def is_configured() -> bool:
 
     If `False`, *structlog* is running with builtin defaults.
 
-    .. versionadded: 18.1
+    .. versionadded: 18.1.0
     """
     return _CONFIG.is_configured
 
@@ -94,7 +94,7 @@ def get_config() -> dict[str, Any]:
 
        Changes to the returned dictionary do *not* affect *structlog*.
 
-    .. versionadded: 18.1
+    .. versionadded: 18.1.0
     """
     return {
         "processors": _CONFIG.default_processors,
@@ -114,12 +114,18 @@ def get_logger(*args: Any, **initial_values: Any) -> Any:
     >>> log.info("hello", x=42)
     y=23 x=42 event='hello'
 
-    :param args: *Optional* positional arguments that are passed unmodified to
-        the logger factory.  Therefore it depends on the factory what they
-        mean.
-    :param initial_values: Values that are used to pre-populate your contexts.
+    Arguments:
 
-    :returns: A proxy that creates a correctly configured bound logger when
+        args:
+            *Optional* positional arguments that are passed unmodified to the
+            logger factory.  Therefore it depends on the factory what they
+            mean.
+
+        initial_values: Values that are used to pre-populate your contexts.
+
+    Returns:
+
+        A proxy that creates a correctly configured bound logger when
         necessary. The type of that bound logger depends on your configuration
         and is `structlog.BoundLogger` by default.
 
@@ -128,8 +134,7 @@ def get_logger(*args: Any, **initial_values: Any) -> Any:
     If you prefer CamelCase, there's an alias for your reading pleasure:
     `structlog.getLogger`.
 
-    .. versionadded:: 0.4.0
-        *args*
+    .. versionadded:: 0.4.0 *args*
     """
     return wrap_logger(None, logger_factory_args=args, **initial_values)
 
@@ -158,23 +163,28 @@ def wrap_logger(
     Default values for *processors*, *wrapper_class*, and *context_class* can
     be set using `configure`.
 
-    If you set an attribute here, `configure` calls have *no* effect for
-    the *respective* attribute.
+    If you set an attribute here, `configure` calls have *no* effect for the
+    *respective* attribute.
 
     In other words: selective overwriting of the defaults while keeping some
     *is* possible.
 
-    :param initial_values: Values that are used to pre-populate your contexts.
-    :param logger_factory_args: Values that are passed unmodified as
-        ``*logger_factory_args`` to the logger factory if not `None`.
+    Arguments:
+
+        initial_values: Values that are used to pre-populate your contexts.
 
-    :returns: A proxy that creates a correctly configured bound logger when
+        logger_factory_args:
+            Values that are passed unmodified as ``*logger_factory_args`` to
+            the logger factory if not `None`.
+
+    Returns:
+
+        A proxy that creates a correctly configured bound logger when
         necessary.
 
     See `configure` for the meaning of the rest of the arguments.
 
-    .. versionadded:: 0.4.0
-        *logger_factory_args*
+    .. versionadded:: 0.4.0 *logger_factory_args*
     """
     return BoundLoggerLazyProxy(
         logger,
@@ -207,22 +217,29 @@ def configure(
 
     Use `reset_defaults` to undo your changes.
 
-    :param processors: The processor chain. See :doc:`processors` for details.
-    :param wrapper_class: Class to use for wrapping loggers instead of
-        `structlog.BoundLogger`.  See `standard-library`, :doc:`twisted`, and
-        `custom-wrappers`.
-    :param context_class: Class to be used for internal context keeping. The
-        default is a `dict` and since dictionaries are ordered as of Python
-        3.6, there's few reasons to change this option.
-    :param logger_factory: Factory to be called to create a new logger that
-        shall be wrapped.
-    :param cache_logger_on_first_use: `wrap_logger` doesn't return an actual
-        wrapped logger but a proxy that assembles one when it's first used.  If
-        this option is set to `True`, this assembled logger is cached.  See
-        `performance`.
-
-    .. versionadded:: 0.3.0
-        *cache_logger_on_first_use*
+    Arguments:
+
+        processors: The processor chain. See :doc:`processors` for details.
+
+        wrapper_class:
+            Class to use for wrapping loggers instead of
+            `structlog.BoundLogger`.  See `standard-library`, :doc:`twisted`,
+            and `custom-wrappers`.
+
+        context_class:
+            Class to be used for internal context keeping. The default is a
+            `dict` and since dictionaries are ordered as of Python 3.6, there's
+            few reasons to change this option.
+
+        logger_factory:
+            Factory to be called to create a new logger that shall be wrapped.
+
+        cache_logger_on_first_use:
+            `wrap_logger` doesn't return an actual wrapped logger but a proxy
+            that assembles one when it's first used. If this option is set to
+            `True`, this assembled logger is cached. See `performance`.
+
+    .. versionadded:: 0.3.0 *cache_logger_on_first_use*
     """
     _CONFIG.is_configured = True
 
@@ -251,7 +268,9 @@ def configure_once(
     It does *not* matter whether it was configured using `configure` or
     `configure_once` before.
 
-    Raises a `RuntimeWarning` if repeated configuration is attempted.
+    Raises:
+
+        RuntimeWarning: if repeated configuration is attempted.
     """
     if not _CONFIG.is_configured:
         configure(
@@ -290,11 +309,10 @@ class BoundLoggerLazyProxy:
     The only points where a bound logger changes state are ``bind()``,
     ``unbind()``, and ``new()`` and that return the actual ``BoundLogger``.
 
-    If and only if configuration says so, that actual bound logger is
-    cached on first usage.
+    If and only if configuration says so, that actual bound logger is cached on
+    first usage.
 
-    .. versionchanged:: 0.4.0
-        Added support for *logger_factory_args*.
+    .. versionchanged:: 0.4.0 Added support for *logger_factory_args*.
     """
 
     def __init__(

src/structlog/_frames.py

@@ -40,10 +40,14 @@ def _find_first_app_frame_and_name(
     """
     Remove all intra-structlog calls and return the relevant app frame.
 
-    :param additional_ignores: Additional names with which the first frame must
-        not start.
+    Arguments:
 
-    :returns: tuple of (frame, name)
+        additional_ignores:
+            Additional names with which the first frame must not start.
+
+    Returns:
+
+        tuple of (frame, name)
     """
     ignores = ["structlog"] + (additional_ignores or [])
     f = sys._getframe()

src/structlog/_log_levels.py

@@ -128,11 +128,14 @@ def make_filtering_bound_logger(min_level: int) -> type[FilteringBoundLogger]:
     - You *can* have (much) more fine-grained filtering by :ref:`writing a
       simple processor <finer-filtering>`.
 
-    :param min_level: The log level as an integer. You can use the constants
-        from `logging` like ``logging.INFO`` or pass the values directly. See
-        `this table from the logging docs
-        <https://docs.python.org/3/library/logging.html#levels>`_ for possible
-        values.
+    Arguments:
+
+        min_level:
+            The log level as an integer. You can use the constants from
+            `logging` like ``logging.INFO`` or pass the values directly. See
+            `this table from the logging docs
+            <https://docs.python.org/3/library/logging.html#levels>`_ for
+            possible values.
 
     .. versionadded:: 20.2.0
     .. versionchanged:: 21.1.0 The returned loggers are now pickleable.