text: from flask import Flask
  from flask_sqlalchemy import SQLAlchemy
  from flask_session import Session
  import logging
  from logging.handlers import RotatingFileHandler
  from config import config,Config
  from redis import StrictRedis
  from flask_wtf import  CSRFProtect,csrf
  
  db = SQLAlchemy()
  redis_store = StrictRedis(host=Config.REDIS_HOST, port=Config.REDIS_PORT, decode_responses=True)
  
  # 集成项目日志
  # 设置日志的记录等级
  logging.basicConfig(level=logging.DEBUG) # 调试debug级
  # 创建日志记录器，指明日志保存的路径、每个日志文件的最大大小、保存的日志文件个数上限
  file_log_handler = RotatingFileHandler("logs/log", maxBytes=1024*1024*100, backupCount=10)
  # 创建日志记录的格式 日志等级 输入日志信息的文件名 行数 日志信息
  formatter = logging.Formatter('%(levelname)s %(filename)s:%(lineno)d %(message)s')
  # 为刚创建的日志记录器设置日志记录格式
  file_log_handler.setFormatter(formatter)
  # 为全局的日志工具对象（flask app使用的）添加日志记录器,current_app
  logging.getLogger().addHandler(file_log_handler)
  
  
  
  def create_app(config_name):
      app = Flask(__name__)
      app.config.from_object(config[config_name])
      db.init_app(app)
      Session(app)
      CSRFProtect(app)
  
      # 导入过滤器
      from info.utils.commons import index_class
      app.add_template_filter(index_class, 'index_class')
  
      # 蓝图
  
      from  info.modules.news import new_blue
      app.register_blueprint(new_blue)
      from info.modules.passport import passport_blue
      app.register_blueprint(passport_blue)
      from info.modules.profile import profile_blue
      app.register_blueprint(profile_blue)
      from info.modules.admin import  admin_blue
      app.register_blueprint(admin_blue)
  
  
      @app.after_request
      def after_request(response):
          csrf_token = csrf.generate_csrf()
          response.set_cookie('csrf_token', csrf_token)
          return response
  
  
  
      return app
  
  