Amaury Forgeot d'Arc <amaur...@gmail.com> added the comment:

On Windows, isatty() is a cheap call: a simple lookup in the _ioinfo structure. 
 And dup2() can still change the destination of a file descriptor, so the new 
attribute can be out of sync...
I suggest to call isatty() on every write.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11395>
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