[Python-checkins] gh-94700: Rewrite the logging.Formatter API ref in structured form (GH-94701)
vsajip
webhook-mailer at python.org
Sat Jul 9 01:04:13 EDT 2022
https://github.com/python/cpython/commit/761eeb62a9af309a0e32662882c552209ddcea1e
commit: 761eeb62a9af309a0e32662882c552209ddcea1e
branch: main
author: CAM Gerlach <CAM.Gerlach at Gerlach.CAM>
committer: vsajip <vinay_sajip at yahoo.co.uk>
date: 2022-07-09T06:03:47+01:00
summary:
gh-94700: Rewrite the logging.Formatter API ref in structured form (GH-94701)
files:
M Doc/library/logging.rst
diff --git a/Doc/library/logging.rst b/Doc/library/logging.rst
index 8716724af5625..9bfed4352a195 100644
--- a/Doc/library/logging.rst
+++ b/Doc/library/logging.rst
@@ -531,55 +531,53 @@ Formatter Objects
.. currentmodule:: logging
-:class:`Formatter` objects have the following attributes and methods. They are
-responsible for converting a :class:`LogRecord` to (usually) a string which can
-be interpreted by either a human or an external system. The base
-:class:`Formatter` allows a formatting string to be specified. If none is
-supplied, the default value of ``'%(message)s'`` is used, which just includes
-the message in the logging call. To have additional items of information in the
-formatted output (such as a timestamp), keep reading.
-
-A Formatter can be initialized with a format string which makes use of knowledge
-of the :class:`LogRecord` attributes - such as the default value mentioned above
-making use of the fact that the user's message and arguments are pre-formatted
-into a :class:`LogRecord`'s *message* attribute. This format string contains
-standard Python %-style mapping keys. See section :ref:`old-string-formatting`
-for more information on string formatting.
-
-The useful mapping keys in a :class:`LogRecord` are given in the section on
-:ref:`logrecord-attributes`.
-
-
.. class:: Formatter(fmt=None, datefmt=None, style='%', validate=True, *, defaults=None)
- Returns a new instance of the :class:`Formatter` class. The instance is
- initialized with a format string for the message as a whole, as well as a
- format string for the date/time portion of a message. If no *fmt* is
- specified, ``'%(message)s'`` is used. If no *datefmt* is specified, a format
- is used which is described in the :meth:`formatTime` documentation.
+ Responsible for converting a :class:`LogRecord` to an output string
+ to be interpreted by a human or external system.
+
+ :param fmt: A format string in the given *style* for
+ the logged output as a whole.
+ The possible mapping keys are drawn from the :class:`LogRecord` object's
+ :ref:`logrecord-attributes`.
+ If not specified, ``'%(message)s'`` is used,
+ which is just the logged message.
+ :type fmt: str
+
+ :param datefmt: A format string in the given *style* for
+ the date/time portion of the logged output.
+ If not specified, the default described in :meth:`formatTime` is used.
+ :type datefmt: str
+
+ :param style: Can be one of ``'%'``, ``'{'`` or ``'$'`` and determines
+ how the format string will be merged with its data: using one of
+ :ref:`old-string-formatting` (``%``), :meth:`str.format` (``{``)
+ or :class:`string.Template` (``$``). This only applies to
+ *fmt* and *datefmt* (e.g. ``'%(message)s'`` versus ``'{message}'``),
+ not to the actual log messages passed to the logging methods.
+ However, there are :ref:`other ways <formatting-styles>`
+ to use ``{``- and ``$``-formatting for log messages.
+ :type style: str
+
+ :param validate: If ``True`` (the default), incorrect or mismatched
+ *fmt* and *style* will raise a :exc:`ValueError`; for example,
+ ``logging.Formatter('%(asctime)s - %(message)s', style='{')``.
+ :type validate: bool
+
+ :param defaults: A dictionary with default values to use in custom fields.
+ For example,
+ ``logging.Formatter('%(ip)s %(message)s', defaults={"ip": None})``
+ :type defaults: dict[str, Any]
- The *style* parameter can be one of '%', '{' or '$' and determines how
- the format string will be merged with its data: using one of %-formatting,
- :meth:`str.format` or :class:`string.Template`. This only applies to the
- format string *fmt* (e.g. ``'%(message)s'`` or ``{message}``), not to the
- actual log messages passed to ``Logger.debug`` etc; see
- :ref:`formatting-styles` for more information on using {- and $-formatting
- for log messages.
-
- The *defaults* parameter can be a dictionary with default values to use in
- custom fields. For example:
- ``logging.Formatter('%(ip)s %(message)s', defaults={"ip": None})``
+ .. versionadded:: 3.2
+ The *style* parameter.
- .. versionchanged:: 3.2
- The *style* parameter was added.
+ .. versionadded:: 3.8
+ The *validate* parameter.
- .. versionchanged:: 3.8
- The *validate* parameter was added. Incorrect or mismatched style and fmt
- will raise a ``ValueError``.
- For example: ``logging.Formatter('%(asctime)s - %(message)s', style='{')``.
+ .. versionadded:: 3.10
+ The *defaults* parameter.
- .. versionchanged:: 3.10
- The *defaults* parameter was added.
.. method:: format(record)
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