构建一个目录结构

user_oper.py

from flask import Blueprint, request, session, redirect, render_template
import functools
# 创建蓝图
user = Blueprint('xkj', __name__)DATA_DICT = {1: {"name": "张三", "age": 22, "gender": "男"},2: {"name": "小红", "age": 18, "gender": "女"}
}@user.route("/f1")
def f1():return 'xkj1'# 使用装饰器来统一验证用户是否登录
def outer(func):# 保证被装饰器装饰的函数的__name__值为原函数名称@functools.wraps(func)def inner(*args, **kwargs):# 验证用户是否登录if not session.get('xx'):return redirect("/web/login")# 这里的return一定不能少，否则# TypeError: The view function for 'index' did not return a valid response.return func(*args, **kwargs)return inner@user.route("/login", methods=["GET", "POST"])
def login():error = Nonemethod = request.methodif method == "POST":username = request.form.get('username')password = request.form.get('password')if username == 'admin' and password == '123':# 将用户信息存入session中session['xx'] = usernamereturn redirect("/web/index")else:error = "用户名或密码错误"return render_template("login.html", error=error)@user.route("/index")
@outer
def index():return render_template("index.html", DATA_DICT=DATA_DICT)@user.route("/edit", methods=['POST', 'GET'])
@outer
def edit():method = request.methodnid = int(request.args.get("nid"))if method == 'POST':DATA_DICT[nid]['name'] = request.form.get('name')DATA_DICT[nid]['age'] = request.form.get('age')DATA_DICT[nid]['gender'] = request.form.get('gender')return redirect("/web/index")user_data = DATA_DICT.get(nid)return render_template("edit.html", info=user_data)# <int:nid>中间一定不能有空格
@user.route("/del/<int:nid>")
@outer
def delete(nid):del DATA_DICT[nid]return redirect("/web/index")

middle_aware.py 

from flask import Flask
from demo.user_oper import userdef create_app():app = Flask(__name__)# 使用session，就必须设置app.secret_key的值app.secret_key = "1"app.register_blueprint(user, url_prefix="/web")return app

start.py

from middle_aware import create_appapp = create_app()if __name__ == '__main__':app.run(host="0.0.0.0", port=8080)