制作首页的显示列表。

{% extends ‘base.html‘ %}
{% block title %}
首页*
{% endblock %}
{% block head %}
<link rel="stylesheet" type="text/css" href="{{ url_for(‘static‘,filename=‘css/first.css‘) }}">
{% endblock %}

{% block main %}
<p>{{username}}</p>

<ul class="list-group">
    <li class="1">
        <span class="1-1" aria-hidden="true"></span>
        <a href="#">username</a>
        <br>
        <a href="#">title</a>
        <span class="1-2">creat_time</span>
        <p>detail {{questions}}</p>
    </li>
</ul>

{% endblock %}

import config
from flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
from functools import wraps
from datetime import datetime

app = Flask(__name__)
app.config.from_object(config)
db = SQLAlchemy(app)

#创建用户模型
class User(db.Model):
    __tablename__ = ‘user‘
    id = db.Column(db.Integer,primary_key=True,autoincrement=True)
    username = db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20),nullable=False)

class Question(db.Model):
    __tablename__ = ‘question‘
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    question = db.Column(db.String(100), nullable=False)
    questionDetail = db.Column(db.Text, nullable=False)
    creat_time = db.Column(db.DateTime, default=datetime.now)
    author_id = db.Column(db.Integer, db.ForeignKey(‘user.id‘))
    author = db.relationship(‘User‘, backref=db.backref(‘question‘))

#db.create_all()


@app.route(‘/‘)
def first():
    context = {
        ‘questions‘:‘python20171201‘
    }
    return render_template(‘first.html‘,**context)

@app.route(‘/sign_up/‘,methods=[‘GET‘,‘POST‘])#登录
def sign_up():
    if request.method == "GET":
        return render_template("sign_up.html")
    else:
        username = request.form.get("username")
        password = request.form.get("password")
        user = User.query.filter(User.username == username).first()
        if user:
            if user.password == password:
                session[‘user‘] = username
                sessionpermanent = True
                return redirect(url_for(‘first‘))
            else:
                return ‘password error‘
        else:
           return ‘username is not existed‘


@app.route(‘/sign_in/‘,methods=[‘GET‘,‘POST‘])#注册
def sign_in():
    if request.method == "GET":
        return render_template("sign_in.html")
    else:
        username = request.form.get("username")
        password = request.form.get("password")
        user = User.query.filter(User.username == username).first()
        if user:
            return ‘username existed.‘
        else:
            user = User(username=username, password=password)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for(‘first‘))

@app.context_processor
def mycontext():
    usern=session.get(‘user‘)
    if usern:
        return {‘username‘:usern}
    else:
        return {}

@app.route(‘/logout/‘)
def logout():
    session.clear()
    return render_template("first.html")

def log(func): #参数是函数
    @wraps(func)
    def wrapper(*args, **kwargs): #定义个函数将其返回
        if session.get(‘user‘):
            return func(*args, **kwargs)
        else:
            return redirect(url_for(‘sign_up‘))
    return wrapper #返回一个函数

@app.route(‘/question/‘, methods=[‘GET‘ , ‘POST‘])
@log
def question():
    if request.method == ‘GET‘:
        return render_template(‘question.html‘)
    else:
        question = request.form.get(‘question‘)
        questionDetail = request.form.get(‘questionDetail‘)
        author_id = User.query.filter(User.username == session.get(‘user‘)).first().id
        question = Question(question = question, questionDetail = questionDetail, author_id = author_id)
        db.session.add(question)
        db.session.commit()
        return redirect(url_for(‘first‘))


if __name__ == ‘__main__‘:
    app.run(debug=True)

*{
   color:silver;

}
.list-group{
    border: solid 2px silver;
    font-size:30px
}