Python logging.Filter()
logging.Filter()
Description:
-logging.Filter(name) method returns an instance of Filter class. if the name is specified, its names logger which, together with its children, will have its events allowed through the filter.
- if we want to allow only specific logger messages then we can apply a filter.
- if the name is the empty string, allows every event.it is better to declare a filter when a need.
Signature:
Filter(name)
where,
name - logger name hierarchy.
Program:
The Engineering package contains a computer package that contains pythondev and javadev as two modules. In MBBS package contain a doctor module.
1.pythondev
import logging
logger = logging.getLogger(__name__)
def getLogMessage():
logger.info('message from Engineering-->computer-->pythondev')
2.javadev
import logging
logger = logging.getLogger(__name__)
def getLogMessage():
logger.info('work from home')
logger.info('message from Engineering-->computer-->javadev')
doctor.py
import logging
logger = logging.getLogger(__name__)
def getLogMessage():
logger.warning('Be safe from corono')
Now consider the University module
University.py
import logging
import sys
from Engineering.computer import pythondev
from Engineering.computer import javadev
from MBBS import doctor
#create logger
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
# create stream handle
streamhdlr = logging.StreamHandler(sys.stdout)
filehdlr = logging.FileHandler('filter.txt',mode='w')
# set level
streamhdlr.setLevel(logging.INFO)
filehdlr.setLevel(logging.INFO)
# add handler
logger.addHandler(streamhdlr)
logger.addHandler(filehdlr)
#create filter
fltr = logging.Filter('Engineering')
# add filter to handler
streamhdlr.addFilter(fltr)
filehdlr.addFilter(fltr)
pythondev.getLogMessage()
javadev.getLogMessage()
doctor.getLogMessage()
output:
message from Engineering-->computer-->pythondev
work from home
message from Engineering-->computer-->javadev
work from home
message from Engineering-->computer-->javadev
filter.txt:
message from Engineering-->computer-->pythondev
work from home
message from Engineering-->computer-->javadev
we can add a filter handler and logger.
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