init

app/__init__.py

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
+from flask_login import LoginManager
+from flask_session import Session
+from config import config
+from flask_bootstrap import Bootstrap
+
+# 初始化扩展，但此时不传入 app
+db = SQLAlchemy()
+migrate = Migrate()
+login_manager = LoginManager()
+sess = Session()
+bootstrap = Bootstrap()
+# login_manager 的基本配置
+login_manager.login_view = 'auth.login' # 后面我们会创建一个叫 'auth' 的蓝图
+
+def create_app(config_name='default'):
+    """
+    应用工厂函数
+    :param config_name: 配置名称 ('development', 'production')
+    :return: Flask app instance
+    """
+    app = Flask(__name__)
+    
+    # 1. 加载配置
+    app.config.from_object(config[config_name])
+    config[config_name].init_app(app)
+    # 2. 初始化扩展
+    db.init_app(app)
+    migrate.init_app(app, db)
+    login_manager.init_app(app)
+    sess.init_app(app)
+    bootstrap.init_app(app)
+    
+    # 3. 注册蓝图 (Blueprint)
+    # 后面我们会在这里添加蓝图
+    from .routes import main as main_blueprint
+    app.register_blueprint(main_blueprint)
+    
+    from .auth import auth as auth_blueprint
+    app.register_blueprint(auth_blueprint, url_prefix='/auth')
+    
+    return app