def namespace_directories(self, depth=None):
        """return list of directories where the namespace should be created /
        can be found
        """
        res = []
        for index, d in enumerate(self.split[:depth]):
            # toplevel gets a dot
            if index > 0:
                d = os.path.join(*d.split('.'))
            res.append('.' + d)
        return res
return list of directories where the namespace should be created /
        can be found
        
dynaconf/vendor/ruamel/yaml/setup.py