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copied!<p>The following script, <code>log1.py</code>:</p> <pre><code>import logging, sys class SingleLevelFilter(logging.Filter): def __init__(self, passlevel, reject): self.passlevel = passlevel self.reject = reject def filter(self, record): if self.reject: return (record.levelno != self.passlevel) else: return (record.levelno == self.passlevel) h1 = logging.StreamHandler(sys.stdout) f1 = SingleLevelFilter(logging.INFO, False) h1.addFilter(f1) rootLogger = logging.getLogger() rootLogger.addHandler(h1) h2 = logging.StreamHandler(sys.stderr) f2 = SingleLevelFilter(logging.INFO, True) h2.addFilter(f2) rootLogger.addHandler(h2) logger = logging.getLogger("my.logger") logger.setLevel(logging.DEBUG) logger.debug("A DEBUG message") logger.info("An INFO message") logger.warning("A WARNING message") logger.error("An ERROR message") logger.critical("A CRITICAL message") </code></pre> <p>when run, produces the following results.</p> <pre> C:\temp>log1.py A DEBUG message An INFO message A WARNING message An ERROR message A CRITICAL message </pre> <p>As you'd expect, since on a terminal <code>sys.stdout</code> and <code>sys.stderr</code> are the same. Now, let's redirect stdout to a file, <code>tmp</code>:</p> <pre> C:\temp>log1.py >tmp A DEBUG message A WARNING message An ERROR message A CRITICAL message </pre> <p>So the INFO message has not been printed to the terminal - but the messages directed to <code>sys.stderr</code> <em>have</em> been printed. Let's look at what's in <code>tmp</code>:</p> <pre> C:\temp>type tmp An INFO message </pre> <p>So that approach appears to do what you want.</p>

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