if you want POSIX, import posix, not os

[Skip Montanaro]

    Michael> The better question is:
    Michael>    Why did it change from documenting these components in the OS-
    Michael>    dependant sections (specifically only posix) to documenting them
    Michael>    mostly in the module-os section in the current release?

I think it was because they were trying to steer people toward

    import os

so new users didn't know to look in the posix chapter for the docs.

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