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Filtering Log Messages
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Each Logger object log has an internal level and filtering mechanism that determines which log messages get handledThe following two methods are used to perform simple filtering based on the numeric level of log messages:
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logsetLevel(level)
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Sets the level of log Only logging messages with a level greater than or equal to level will be handled All other messages are simply ignored By default, the level is loggingNOTSET which processes all log messages
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logisEnabledFor(level)
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Returns True if a logging message at level level would be processed Logging messages can also be filtered based on information associated with the message itself for example, the filename, the line number, and other detailsThe following methods are used for this:
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logaddFilter(filt)
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Adds a filter object, filt, to the logger
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logremoveFilter(filt)
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Removes a filter object, filt, from the logger In both methods, filt is an instance of a Filter object
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Filter(logname)
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Creates a filter that only allows log messages from logname or its children to pass through For example, if logname is 'app', then messages from loggers such as 'app', 'appnet', or 'appuser' will pass, but messages from a logger such as 'spam' will not Custom filters can be created by subclassing Filter and implementing the method filter(record) that receives as input a record containing information about a logging message As output, True or False is returned depending on whether or not the message should be handledThe record object passed to this method typically has the following attributes:
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Attribute
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recordname recordlevelname recordlevelno recordpathname recordfilename recordmodule recordexc_info recordlineno recordfuncName recordcreated recordthread recordthreadName recordprocess
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Logger name Level name Level number Pathname of the module Base filename Module name Exception information Line number where log message was issued Function name where log message was issued Time at which issued Thread identifier Thread name PID of currently executing process
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The following example illustrates how you create a custom filter:
class FilterFunc(loggingFilter): def _ _init_ _(self,name): selffuncName = name def filter(self, record): if recordfuncName == selffuncName: return False else: return True logaddFilter(FilterFunc('foo')) logaddFilter(FilterFunc('bar')) # Ignore all messages originating from foo() # Ignore all messages originating from bar()
Message Propagation and Hierarchical Loggers
In advanced logging applications, Logger objects can be organized into a hierarchyThis is done by giving a logger object a name such as 'appnetclient' Here, there are actually three different Logger objects called 'app', 'appnet', and 'appnetclient'When a message is issued on any of the loggers and it successfully passes that logger s filter, it propagates to and is handled by all of the parents For example, a message successfully issued on 'appnetclient' also propagates to 'appnet', 'app' and the root logger The following attributes and methods of a Logger object log control this propagation
logpropagate
A Boolean flag that indicates whether or not messages propagate to the parent logger By default, this is set to True
loggetEffectiveLevel()
Returns the effective level of the logger If a level has been set using setLevel(), that level is returned If no level has been explicitly set (the level is loggingNOTSET in this case), this function returns the effective level of the parent logger instead If none of the parent loggers have a level set, the effective level of the root logger will be returned The primary purpose of hierarchical logging is to be able to more easily filter log messages originating from different parts of a large application For example, if you wanted to shut down log messages from the 'appnetclient' part of an application, you might add configuration code such as the following:
import logging logginggetLogger('appnetclient')propagate = False
Or, in this code, we re ignoring all but the most severe messages from a program module:
import logging logginggetLogger('appnetclient')setLevel(loggingCRITICAL)
A subtle aspect of hierarchical loggers is that the decision to handle a log message is made entirely by the level and filters on the Logger object on which the message was issued, not by the filters on any of the parentsThus, if a message passes the first set of filters, it is propagated to and handled by all the parent loggers regardless of their own filter and level settings even if these filters would have rejected the message At first glance, the behavior is counterintuitive and might even seem like a bug However, setting the level of a child logger to a value that is lower than its parent is one way to