【CMDB】高级配置

思路：

　　一份默认配置，一份用户自定义配置，将两者结合，自定义优先级大于默认配置

目录结构

'''
用户自定义的配置文件,settings.py
'''
USER = 'xiaoming'
PASSWORD = '123'

'''
系统默认配置文件,global_settings.py
'''

TEL = '13012312345'

'''用户自定义配置和系统默认配置文件的统一 config.py'''
import os
import importlib
from . import global_settings

class Settings(object):
    def __init__(self):
        # 默认配置文件
        for name in dir(global_settings):
            if name.isupper():
                value = getattr(global_settings,name)
                setattr(self,name,value)

        # 自定义配置文件
        settings_module = os.environ.get('USER_SETTINGS')
        if not settings_module:
            return
        # 导入模块
        m = importlib.import_module(settings_module)
        for name in dir(m):
            if name.isupper():
                value = getattr(m,name)
                setattr(self,name,value)

settings = Settings()

'''
start.py
使用变量
'''
import os
os.environ['USER_SETTINGS'] = 'config.settings'

if __name__ == '__main__':
    from lib.conf.config import settings
    print(settings.USER)