Python flask 500错误表示什么?Internal Server Error，pythonflask,在跟着《Flask We

Python flask 500错误表示什么?Internal Server Error，pythonflask,在跟着《Flask We

在跟着《Flask Web开发：基于Python的Web应用开发实战》这本书中的例子写程序。
有两个页面，一个是主页面index，一个是user页面
打开主页会出现Internal Server Error，/user/xxx页面显示正常
hello.py

from flask import Flask, render_templatefrom flask.ext.script import Managerfrom flask.ext.bootstrap import Bootstrapfrom flask.ext.moment import Momentfrom flask.ext.wtf import Formfrom wtforms import StringField, SubmitFieldfrom wtforms.validators import Requiredfrom datetime import datetimeapp = Flask(__name__)app.config['SECRET_KEY'] = 'hack me'manager = Manager(app)bootstrap = Bootstrap(app)moment = Moment(app)class NameForm(Form):    name = StringField('What is your name?', validators=[Required()])    submit = SubmitField('Submit')@app.errorhandler(404)def page_note_found(e):    return render_template('404.html'), 404@app.errorhandler(500)def internal_server_error(e):    return render_template('500.html'), 500@app.route('/', methods=['GET', 'POST'])def index():    name = None    form = NameForm()    if form.validate_on_submit():        name = form.name.data        form.name.data = ''    return render_template('index.html', form=form, name=name, current_time=datetime.utcnow())@app.route('/user/<name>')def user(name):    return render_template('user.html', name=name)if __name__ == '__main__':    manager.run()

index.html

{% extends "base.html" %}{% import "bootstrap/wtf.html" as wtf %}{% block title %}Flasky{% endblock %}{% block page_content %}<div class="page-header">        <h1>Hello ,{% if name %}{{ name }}{% else %}Stranger{% endif %}!</h1>    </div>    {{ wtf.quick_form(form) }}    <p>the local time is {{ moment(current_time).format('LLL') }}</p>    <p>that was {{ moment(current_time).fromnow(refresh=True) }}</p>{% endblock %}

base.html

{% extends "bootstrap/base.html" %}{% block title %}Flasky{% endblock %}<!--引用moment.js-->{% block scripts %}    {{ super() }}    {{ moment.include_moment() }}{% endblock %}{% block head %}{{ super() }}<link rel="shortcut icon" href="{{ url_for('static', filename='favicon.ico') }}" type="image/x-icon"><link rel="icon" href="{{ url_for('static', filename='favicon.ico') }}" type="image/x-icon">{% endblock %}{% block navbar %}<div class="navbar navbar-inverse" role="navigation">    <div class="container">        <div class="navbar-header">            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">                <span class="sr-only">Toggle navigation</span>                <span class="icon-bar"></span>                <span class="icon-bar"></span>                <span class="icon-bar"></span>            </button>            <a class="navbar-brand" href="/">Flasky</a>        </div>        <div class="navbar-collapse collapse">            <ul class="nav navbar-nav">                <li><a href="/">Home</a></li>            </ul>        </div>    </div></div>{% endblock %}{% block content %}<div class="container">    {% block page_content %}{% endblock %}</div>{% endblock %}

吐槽一下segmentfault的编辑器：在编辑模式下排版正常，可是实际显示的样式和编辑模式下的排版不一样。

pythonapp.run(debug=True)#orapp.debug = True

编橙之家文章，