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copied!<p>Best practice is, in each module, to have a logger defined like this:</p> <pre><code>import logging logger = logging.getLogger(__name__) </code></pre> <p>near the top of the module, and then in other code in the module do e.g.</p> <pre><code>logger.debug('My message with %s', 'variable data') </code></pre> <p>If you need to subdivide logging activity inside a module, use e.g.</p> <pre><code>loggerA = logging.getLogger(__name__ + '.A') loggerB = logging.getLogger(__name__ + '.B') </code></pre> <p>and log to <code>loggerA</code> and <code>loggerB</code> as appropriate.</p> <p>In your main program or programs, do e.g.:</p> <pre><code>def main(): "your program code" if __name__ == '__main__': import logging.config logging.config.fileConfig('/path/to/logging.conf') main() </code></pre> <p>or </p> <pre><code>def main(): import logging.config logging.config.fileConfig('/path/to/logging.conf') # your program code if __name__ == '__main__': main() </code></pre> <p>See <a href="http://docs.python.org/howto/logging.html#logging-from-multiple-modules">here</a> for logging from multiple modules, and <a href="http://docs.python.org/howto/logging.html#configuring-logging-for-a-library">here</a> for logging configuration for code which will be used as a library module by other code.</p> <p><strong>Update:</strong> When calling <code>fileConfig()</code>, you may want to specify <code>disable_existing_loggers=False</code> if you're using Python 2.6 or later (see <a href="http://docs.python.org/2/library/logging.config.html#logging.config.fileConfig">the docs</a> for more information). The default value is <code>True</code> for backward compatibility, which causes all existing loggers to be disabled by <code>fileConfig()</code> unless they or their ancestor are explicitly named in the configuration. With the value set to <code>False</code>, existing loggers are left alone. If using Python 2.7/Python 3.2 or later, you may wish to consider the <code>dictConfig()</code> API which is better than <code>fileConfig()</code> as it gives more control over the configuration.</p>

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