#__init__.py里面創(chuàng)建實(shí)例,應(yīng)用實(shí)例對象創(chuàng)建完再引入視圖函數(shù)的模塊,因?yàn)檫@時候視圖函數(shù)上的@app.route()才有效
from flask import Flask
from myapp.admin import admin
import config
app = Flask(__name__)
app.config.from_object('config')
app.register_blueprint(admin)
from myapp import views

#run.py里面我們來啟動剛才創(chuàng)建的應(yīng)用實(shí)例
from myapp import app
app.run(host='0.0.0.0')

#__init__.py 改變創(chuàng)建app實(shí)例的方式,不之間創(chuàng)建app,而是通過create_app函數(shù)里面創(chuàng)建,再返回app對象,這樣的好處就是調(diào)用的時候才創(chuàng)建,想創(chuàng)建多少就調(diào)用多少,而且每次調(diào)用都能應(yīng)用不同的配置參數(shù),這里面這個create_app()就是應(yīng)用的工廠方法!在工廠方法里面我們分別加載了配置擴(kuò)展和藍(lán)圖!敲黑板!!!
from flask import Flask
from flask.ext.mail import Mail
from flask.ext.sqlalchemy import SQLAlchemy
from werkzeug.utils import import_string
mail = Mail()
db = SQLAlchemy()
blueprints = [
  'myapp.main:main',
  'myapp.admin:admin',
]
def create_app(config):
  app = Flask(__name__)
  app.config.from_object(config)
  # Load extensions
  mail.init_app(app)
  db.init_app(app)
  # Load blueprints
  for bp_name in blueprints:
    bp = import_string(bp_name)
    app.register_blueprint(bp)
  return app

#敲黑板!!!需要注意,用了工廠方法之后,就不像在單一文件中一樣有全局的app應(yīng)用實(shí)例對象了,那怎么辦呢,沒有app就不能用裝飾器給視圖函數(shù)路由了,這里面我們要畫重點(diǎn)了:Flask的藍(lán)圖功能,我們剛才工廠函數(shù)里面已經(jīng)注冊了藍(lán)圖了,我們要用藍(lán)圖對象路由
from flask import Blueprint
main = Blueprint('main', __name__)
from myapp.main import views

from myapp.main import main
@main.route('/')
def index():
  return '<h1>Hello World from app factory!</h1>'

from myapp import create_app
import config
app = create_app('config')
app.run(host='0.0.0.0', debug=True)