import importlib

import os

from conf import gsettings

class Settings(object):

    def __init__(self):

        #先加载全局配置

        for item in dir(gsettings):

            if item.isupper():

                k=item

                v=getattr(gsettings,k)

                #给对象设置键值对

                setattr(self,k,v)

        #加载用户settings

        setting_path=os.environ.get("SETTING")

        settings_module=importlib.import_module(setting_path)

        for s in dir(settings_module):

            if s.isupper():

                k=s

                v=getattr(settings_module,k)

                #给对象设置键值对

                setattr(self,k,v)

settings=Settings()

NAME='from system settings'

NAME="from customer settings"

import os,sys

BASE_DIR=os.path.dirname(__file__)

sys.path.append(BASE_DIR)

# 设置一个全局的键值对

os.environ.setdefault('SETTING','lib.settings')

from  conf import settings

print(settings.NAME)