用户配置了使用用户的 , 用户没配置使用默认的

文件目录

mysetting
|
|--conf  
|    |
|    ---__init__.py
|    |
|    ---globalsetting.py (系统默认配置)
|
---usersetting
|   |
|   ---setting.py(用户的配置)
|
---- test.py

init.py ,实现功能的代码

# init.py ,
import os
import importlib
from conf import globalsetting

class Setting:
    def __init__(self):
        user_setting = os.environ.get('user_setting')
        for setting in dir(globalsetting):
            if setting.isupper():
                setattr(self, setting, getattr(globalsetting, setting))
        mod = importlib.import_module(user_setting)
        for setting in dir(mod):
            if setting.isupper():
                setattr(self, setting, getattr(mod, setting))

settings = Setting()

globalsetting.py与setting.py存放配置信息, 如DEBUG=True

test.py为程序的入口

# test.py
import os

#为环境变量添加一个user_setting:'usersetting.setting' ,
os.environ.setdefault('user_setting', 'usersetting.setting')
from conf import settings

print(settings.DEBUG)