快速玩Flask框架，为微博做些准备
part 1 python程序 from flask importFlask, render_template, session, redirect, url_for, flashfrom flask_bootstrap importBootstrapfrom flask_moment importMomentfrom datetime import datetimefrom flask_wtf importFormfrom wtforms importStringField,SubmitFieldfrom wtforms.validators importRequiredfrom flask_sqlalchemy importSQLAlchemyfrom flask_script importManagerimport osbasedir = os.path.abspath(os.path.dirname(__file__))app =Flask(__name__)#wtf表单验证app.config['SECRET_KEY']='hard to guess string'#数据库URLapp.config['SQLALCHEMY_DATABASE_URI']= \'sqlite:///'+ os.path.join(basedir,'data.sqlite')#每次请求结束后自动提交数据变动app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN']=Truebootstrap =Bootstrap(app)moment =Moment(app)db =SQLAlchemy(app)manager =Manager(app)#wtf表单类classNameForm(Form): name =StringField('What is your name?', validators=[Required()]) submit =SubmitField('Submit')#数据库中的table类classRole(db.Model): __tablename__ ='roles' id = db.Column(db.Integer, primary_key=True) name = db.Column(db.String(64), unique=True) users = db.relationship('User', backref='role', lazy='dynamic')def __repr__(self):return'<Role %r>'% self.nameclassUser(db.Model): __tablename__ ='users' id = db.Column(db.Integer, primary_key=True) username = db.Column(db.String(64), unique=True, index=True) role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))def __repr__(self):return'<User %r>'% self.username#主页@app.route('/', methods=['GET','POST'])def index(): form =NameForm()if form.validate_on_submit(): user =User.query.filter_by(username=form.name.data).first()if user isNone: user =User(username=form.name.data) db.session.add(user) session['known']=Falseelse: session['known']=True session['name']= form.name.data form.name.data =''return redirect(url_for('index'))return render_template('user.html', form=form, name=session.get('name'), known=session.get('known',False), current_time=datetime.utcnow())#404页@app.errorhandler(404)def page_not_found(e):return render_template('404.html'),404#500页@app.errorhandler(500)def internal_server_error(e):return render_template('500.html'),500#manager.run() 用于是服务器在命令行运行if __name__ =='__main__': app.run(debug=True)# manager.run() part 2 基模板 主页面： <!-- 基于bootstrap/base.html的基模板 默认有导航栏 page——content可重写-->{% extends "bootstrap/base.html" %}<!-- 导入moment.js -->{% block scripts %} {{ super() }} {{ moment.include_moment() }}{% endblock %}{% block title %}Flasky{% endblock %}{% block head %} {{ super() }}<linkrel="shortcut icon"href="{{ url_for('static', filename = 'favicon.ico') }}"type="image/x-icon"><linkrel="icon"href="{{ url_for('static', filename = 'favicon.ico') }}"type="image/x-icon">{% endblock %}{% block navbar %}<divclass="navbar navbar-inverse"role="navigation"><divclass="container"><divclass="navbar-header"><buttontype="button"class="navbar-toggle"data-toggle="collapse"data-target=".navbar-collapse"><spanclass="sr-only">Toggle navigation</span><spanclass="icon-bar"></span><spanclass="icon-bar"></span><spanclass="icon-bar"></span></button><aclass="navbar-brand"href="/">Flasky</a></div><divclass="navbar-collapse collapse"><ulclass="nav navbar-nav"><li><ahref="/">Home</a></li></ul></div></div></div>{% endblock %}{% block content %}<!-- 弹出警告信息--><divclass="container"> {% for message in get_flashed_messages() %}<divclass="alert alert-warning"><buttontype="button"class="close"data-dismiss="alert">×</button> {{ message }}</div> {% endfor %} {% block page_content %}{% endblock %}</div>{% endblock %} 自定义错误页面： <!DOCTYPE html>{% extends "base.html" %}{% block title %}Flasky - Page Not Found{% endblock %}{% block page_content %}<divclass="page-header"><h1>Not Found</h1></div>{% endblock %} 来自为知笔记(Wiz)