db变量定义位置问题

来源：4-9 打造高可用flask mvc框架

合法俊哥

2019-09-19

# -*- coding: utf-8 -*-
from flask import Flask
from flask_script import Manager
from flask_sqlalchemy import SQLAlchemy
import os
class Application( Flask ):
    def __init__(self,import_name):
        super( Application,self ).__init__( import_name )
        self.config.from_pyfile( 'config/base_setting.py' )
        if "ops_config" in os.environ:
            self.config.from_pyfile( 'config/%s_setting.py'%os.environ['ops_config'] )

        db.init_app( self )

db = SQLAlchemy()
app = Application( __name__ )
manager = Manager( app )

请问下，这里的db变量为什么不放到Application类里面初始化的时候定义呢，这么写感觉有点不符合阅读习惯，定义Application类的时候，db变量会报错

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