Bugs item #1164953, was opened at 2005-03-16 20:38
Message generated for change (Tracker Item Submitted) made by Item Submitter
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Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: logistix (logistix)
Assigned to: Nobody/Anonymous (nobody)
Summary: logging.basicConfig creates phantom handler
Initial Comment:
calling logging.basicConfig() creates a phantom handler
that doesn't operate in an intuitive way. A reproducable
follows.
My actual use case: I started off using the logging
module on a project with the builting logging.info(),
logging.debug(), logging.error() functions. As my needs
got more sophisticated, I started creating some loggers
via logging.getLogger('a.b.c') I setup a custom handler
to do formatting without printing "INFO:a.b.c" headers.
One of my import statements triggered a call to
logging.basicConfig. Halfway through the running
program, my logging messages started showing up
twice. Once without the header and once with. I
eventually tracked this down to usage of a logging.info()
statement. I tried explicitly calling logging.basicConfig
(level=logging.ERROR) to disable the duplicate errors,
but that didn't work.
A trivial patch is attached. It fixes the problem if you
explicitly call logging.basicConfig. I don't know if it will
fix the implicit calls by logging.info(), etc.
C:\Python24>python
Python 2.4 (#60, Nov 30 2004, 11:49:19) [MSC v.1310
32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more
information.
>>> import logging
>>>
>>> logger = logging.getLogger('foo')
>>> logger.setLevel(logging.INFO)
>>> logger.info('bar') # no output yet
No handlers could be found for logger "foo"
>>>
>>> console = logging.StreamHandler()
>>> console.setLevel(logging.INFO)
>>> console.setFormatter(logging.Formatter("%
(message)s")
... )
>>> logger.addHandler(console)
>>>
>>> logger.info('foo')
foo
>>>
>>> logger.warning('foo')
foo
>>>
>>> logger.debug('foo')
>>>
>>> logger.info('foo')
foo
>>>
>>> logging.basicConfig(level=logging.ERROR)
>>>
>>> logger.info('foo')
foo
INFO:foo:foo
>>> ^Z
C:\Python24>
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