更好的利用配置文件和importlib

需求：做不同的操作时只需修改配置文件即可完成

# message/email.py

from .base import Base  # 子类必须实现send方法，否则抛出异常

class Email(Base):
    """
    发送邮件提醒相关
    """
    def __init__(self):
        """
        邮箱相关数据初始化
        """
        self.username = 'zhou'
        self.pwd = '123'

    def send(self,msg):
        pass

#message/msg.py

from .base import Base

class Msg(Base):
    """
    发送短信提醒相关
    """

    def __init__(self):
        """
        短信相关数据初始化
        """
        self.username = 'asdf'
        self.pwd = 'asdf'

    def send(self, msg):
        pass

# settings.py

MSG_LIST = [
    "utils.message.email.Email",
    "utils.message.msg.Msg",
    "utils.message.wechat.WeChat",
]

# message/init.py

import settings
import importlib

def send_msgs(msg):

    for path in settings.MSG_LIST:
        m,c = path.rsplit('.',maxsplit=1)
        md = importlib.import_module(m) #导入模块
        obj = getattr(md,c)() # 利用反射找到方法
        obj.send(msg)  # 执行方法

#使用

from message import send_msgs

send_msgs("xxxxx")