Martin Panter added the comment:

I wouldn’t expect to see a message for stderr because there is nowhere else to 
send the message. However with my patch for Issue 5319, at least we get a 
non-zero exit status.

Brandon: I agree this should be under sys.stdin/out/err; I wasn’t saying to put 
it under the io.TextIOBase documentation. What I meant was one option would be 
to refer to that class as a duck-typing API. Say something like: “sys.stdout 
[etc] may be replaced with other objects, as long as they implement [the 
write-only parts, etc of] the TextIOBase API [optionally ‘buffer’ etc]”. Exact 
details to be determined.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12020>
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