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The logging module provides a flexible facility for applications to log events, errors, warnings, and debugging informationThis information can be collected, filtered, written to files, sent to the system log, and even sent over the network to remote machines This section covers the essential details of using this module for most common cases
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The main focus of the logging module concerns the issuing and handling of log messages Each message consists of some text along with an associated level that indicates its severity Levels have both a symbolic name and numerical value as follows:
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CRITICAL ERROR WARNING INFO DEBUG NOTSET
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Critical errors/messages Errors Warning messages Informative messages Debugging No level set
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These different levels are the basis for various functions and methods throughout the logging module For example, there are methods to issue log messages at each level as well as filters that work by blocking messages that don t meet a certain threshold value
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Before using any other functions in the logging module, you should first perform some basic configuration of a special object known as the root loggerThe root logger is responsible for managing the default behavior of log messages including the logging level, output destination, message format, and other basic detailsThe following function is used for configuration:
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basicConfig([**kwargs])
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Performs basic configuration of the root loggerThis function should be called before any other logging calls are madeThe function accepts a number of keyword arguments:
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filename filemode format datefmt level
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Appends log messages to a file with the given filename Specifies the mode used to open the file By default, mode 'a' (append) is used Format string used to produce log messages Format string used to output dates and times Sets the level of the root logger All log messages with a level equal to or above this level will be processed Lower-level messages will be silently ignored Provides an open file to which log messages are sent The default stream is sysstderr This parameter may not be used simultaneously with the filename parameter
stream
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Most of these parameters are self-explanatoryThe format argument is used to specify the format of log messages along with optional contextual information such as filenames, levels, line numbers, and so forth datefmt is a date format string compatible with the timestrftime() function If omitted, the date format is set to the ISO8601 format The following expansions are recognized in format:
Format
%(name)s %(levelno)s %(levelname)s %(pathname)s %(filename)s %(funcName)s %(module)s %(lineno)d %(created)f %(asctime)s %(msecs)s %(thread)d %(threadName)s %(process)d %(message)s
Description
Name of the logger Numeric logging level Text name of the logging level Pathname of the source file where the logging call was executed filename of the source file where the logging call was executed Function name in which the logging call was made Module name where the logging call executed Line number where the logging call executed Time when the logging call executed The value is a number as returned by timetime() ASCII-formatted date and time when the logging call was executed Millisecond portion of the time when the logging call executed Thread ID Thread name Process ID The logged message (supplied by user)
Here is an example that illustrates a single configuration where log messages with a level of INFO or higher are appended to a file:
import logging loggingbasicConfig( filename = "applog", format = "%(levelname)-10s %(asctime)s %(message)s" level = loggingINFO )
With this configuration, a CRITICAL log message of 'Hello World' will appear as follows in the log file 'applog'
CRITICAL 2005-10-25 20:46:57,126 Hello World
Logger Objects
In order to issue log messages, you have to obtain a Logger objectThis section describes the process of creating, configuring, and using these objects
Creating a Logger
To create a new Logger object, you use the following function:
getLogger([logname])
Returns a Logger instance associated with the name logname If no such object exists, a new Logger instance is created and returned logname is a string that specifies a name