__init__.py

from . import default
import importlib


class CFG:
    def __init__(self):
        self.__dict__['cfg'] = None
    
    def __getattr__(self, name):
        return getattr(self.__dict__['cfg'], name)
    
    def __setattr__(self, name, val):
        setattr(self.__dict__['cfg'], name, val)


cfg = CFG()
cfg.__dict__['cfg'] = default


def setup_config(cfg_name):
    global cfg
    module_name = 'libs.configs.' + cfg_name
    cfg_module = importlib.import_module(module_name)
    cfg.__dict__['cfg'] = cfg_module