New submission from Fabian:
If I get and configure a named logger in the main module and another module
that is imported uses the root logging functions (e.g., logging.info("Hello
World!")) somehow affects the configuration of the first (named) logger.
The file m1.py defines the logger "testlogger" and then imports the module
m2.py. In m2.py the root logger is used through logging.info(...). This message
apparantly doesn't appear anywhere.
After the import in m1.py the previously defined logger is used through
logger.info(...). This message appears (formatted) in the logfile:
2013-04-16 11:23:56,231 INFO Hello from __main__
and (unformatted) at stdout:
INFO:testlogger:Hello from __main__
I did not expect this behavior, therefore I reported this bug. In my
expectation the call to logging.info() should not affect the behavior of the
named and configured logger.
Main module (m1.py):
import logging
def setup_logging():
# made this a function to avoid cluttering the global namespace
logger = logging.getLogger("testlogger")
logger.setLevel(logging.DEBUG)
formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
handler = (logging.FileHandler("testlog.log"),
logging.StreamHandler())
handler = handler[0] # 0 : write to logfile, 1 : write to stdout
handler.setFormatter(formatter)
logger.addHandler(handler)
return logger
logger = setup_logging()
import m2
logger.info("Hello from %s", __name__)
Other module (m2.py)
import logging
logging.info("Hello from %s", __name__)
I observed this behavior with Python v2.7.3
----------
components: IO
messages: 187061
nosy: fmueller
priority: normal
severity: normal
status: open
title: root logging functions break logger configuration
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue17749>
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