nt, then it is
assumed to be a directory, and will be the parent directory of the result.
On POSIX, and on Windows if LOCALAPPDATA is not defined, the user's home
directory - using os.expanduser('~') - will be the parent directory of
the result.

The result is just the directory '.distlib' in the parent directory as
determined above, or with the name specified with ``suffix``.
z.distlib