undocumented functions in pkgutil

[Michele Simionato]

I see that the pkgutil module has many useful functions which are
however undocumented.
Does anybody know why it is so? In particolar, can I safely use
pkg.walk_packages
without risking a change of interface in the future? I looks unlikely,
since pkgutil is
used in setuptools, but I want to be sure before relying on it.

    Michele Simionato