'create & return the directory joined with args.
pass a \'msg\' keyword argument to set the commit message.'

def mkdir(self, *args, **kwargs):

    commit_msg = kwargs.get('msg', 'mkdir    by    py    lib    invocation')
    createpath = self.join(*args)
    createpath._svnwrite('mkdir', '-m', commit_msg)
    self._norev_delentry(createpath.dirpath())
    return createpath
