I'm using a function (see attachment) similar to that described on Page 386 (Section 9.12) of the Python Cookbook (Second Edition) to capture the stdout and stderr streams of programs run with popen2.Popen3. This involves using select.select() to detect the availability of data on the two streams. Sometimes, what looks like a debugging message: "EXCEPTION IN SAFE SELECT 9\n" gets injected into the stdout stream. As far as I can tell this has only started occuring after updating to version 2.4.4. No exception occurs and the string just silently appears in stdout. Apart from the bogus text in stdout everything seems to be working correctly and I'm able to work around the problem by looking for the string and removing whenever it occurs. It looks to me like a debugging message that somebody forgot to remove.
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