I cannot perform an on-the-fly logging fileHandle change.
For example, I have 3 classes
one.py
import logging
class One():
def __init__(self,txt="?"):
logging.debug("Hey, I'm the class One and I say: %s" % txt)
two.py
import logging
class Two():
def __init__(self,txt="?"):
logging.debug("Hey, I'm the class Two and I say: %s" % txt)
config.py
import logging
class Config():
def __init__(self,logfile=None):
logging.debug("Reading config")
self.logfile(logfile)
myapp
from one import One
from two import Two
from config import Config
import logging
#Set default logging
logging.basicConfig(
level=logging.getLevelName(DEBUG),
format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
filename=None
)
logging.info("Starting with stdout")
o=One(txt="STDOUT")
c=Config(logfile="/tmp/logfile")
# Here must be the code that change the logging configuration and set the filehandler
t=One(txt="This must be on the file, not STDOUT")
If I try loggin.basicConfig()
again, it doesn't work.
Indeed, logging.basicConfig
does nothing if a handler has been set up already:
This function does nothing if the root logger already has handlers configured, unless the keyword argument force is set to True.
You'll need to either add force=True
(requires Python 3.8 or newer), or, alternatively, replace the current handler on the root logger:
import logging
fileh = logging.FileHandler('/tmp/logfile', 'a')
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
fileh.setFormatter(formatter)
log = logging.getLogger() # root logger
for hdlr in log.handlers[:]: # remove all old handlers
log.removeHandler(hdlr)
log.addHandler(fileh) # set the new handler
See the Configuring Logging chapter in the Python Logging HOWTO.