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

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Are there tests for this?

Not sure what you mean: there are several tests using isatty() in test suite.

Regardless, there is no #ifdef around the isatty() definition in posixmodule.c, so I can only assume it exists on all platforms.

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nosy: +pitrou

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