Logging module: problem with some mapping keys

[Tekkaman]

I'm getting a strange behaviour from the "pathname" and "lineno"
formatter mapping keys. Instead of my file and my line number I get:

/usr/lib/python2.4/logging/__init__.py

as the file, and 1072 as the line number. I set up my config as
follows:

logBaseConf = {
        'level'   : logging.DEBUG,
        'format'  : "%(levelname)-8s|%(asctime)s|%(pathname)s,
%(name)s, line %(lineno)s|%(message)s",
        'datefmt ': '%d %b %Y, %H:%M:%S',
        'filename': 'logtest.log',
        'filemode': 'a'
        }
logging.basicConfig(**logBaseConf)

I'm not using any executable-generating tools such as cx_Freeze or
Psyco. In fact, I'm getting this error on a very basic script with the
specific purpose of testing the logging module capabilities.

Thanks in advance for any contribution.

T.