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| -rw-r--r-- | Doc/whatsnew/3.2.rst | 43 |
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diff --git a/Doc/whatsnew/3.2.rst b/Doc/whatsnew/3.2.rst index 7e77dcc..9e1b26a 100644 --- a/Doc/whatsnew/3.2.rst +++ b/Doc/whatsnew/3.2.rst @@ -51,6 +51,49 @@ This article explains the new features in Python 3.2, compared to 3.1. +PEP 391: Dictionary Based Configuration for Logging +=================================================== + +The :mod:`logging` module had two ways of configuring the module, either +calling functions for each option or by reading an external file saved +in a ConfigParser format. Those options did not provide the flexibility +to create configurations from JSON or YAML files and they did not support +incremental configuration which is needed for specifying logger options +from a command line. + +To support a more flexible style, the module now offers +:func:`logging.config.dictConfig` to use dictionaries to specify logger +configurations (including formatters, handlers, filters, and loggers). +For example:: + + >>> import logging.config + >>> logging.config.dictConfig(json.load(open('log.cfg', 'rb'))) + +The above fragment configures logging from a JSON encoded dictionary stored in +file called "log.cfg". Here's a working example of a configuration dictionary:: + + {"version": 1, + "formatters": {"brief": {"format": "%(levelname)-8s: %(name)-15s: %(message)s"}, + "full": {"format": "%(asctime)s %(name)-15s %(levelname)-8s %(message)s"}, + }, + "handlers": {"console": { + "class": "logging.StreamHandler", + "formatter": "brief", + "level": "INFO", + "stream": "ext://sys.stdout"}, + "console_priority": { + "class": "logging.StreamHandler", + "formatter": "full", + "level": "ERROR", + "stream": "ext://sys.stderr"}, + }, + "root": {"level": "DEBUG", "handlers": ["console", "console_priority"]}} + +.. seealso:: + + :pep:`391` - Dictionary Based Configuration for Logging + PEP written by Vinay Sajip. + PEP 3147: PYC Repository Directories ===================================== |