[issue18553] os.isatty() is not Unix only

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


----------
stage:  -> needs patch
type:  -> behavior
versions:  -Python 3.1, Python 3.2, Python 3.5

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18553>
_______________________________________