[ python-Bugs-1683316 ] select.select() injecting spurious text in stdout

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Bugs item #1683316, was opened at 2007-03-18 17:34
Message generated for change (Comment added) made by sf-robot
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Category: Python Library
Group: Python 2.4
>Status: Closed
Resolution: Invalid
Priority: 5
Private: No
Submitted By: Peter Williams (peter_ono)
Assigned to: Nobody/Anonymous (nobody)
Summary: select.select() injecting spurious text in stdout

Initial Comment:
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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>Comment By: SourceForge Robot (sf-robot)
Date: 2007-04-02 19:20

Message:
Logged In: YES 
user_id=1312539
Originator: NO

This Tracker item was closed automatically by the system. It was
previously set to a Pending status, and the original submitter
did not respond within 14 days (the time period specified by
the administrator of this Tracker).

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Comment By: Georg Brandl (gbrandl)
Date: 2007-03-19 02:12

Message:
Logged In: YES 
user_id=849994
Originator: NO

I can find no occurrence of the message or parts of it in the current 2.5
or 2.6 branches.

Please make sure that it is Python that emits that message.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1683316&group_id=5470