Frog/frog.py

from flask import Flask,request,make_response,redirect,render_template,url_for,abort
app=Flask(__name__)

@app.errorhandler(404)
def page_not_found(e):
    return render_template('404.html'),404

@app.errorhandler(500)
def internal_server_error(e):
    return render_template('500.html'),500

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/post/')
def posts():
    allposts=[{'id':1,'title':'title1'},{'id':2,'title':'title2'}]
    return render_template('posts.html',posts=allposts)

@app.route('/post/<int:id>')
def post(id):
    return render_template('post.html',id=id)

@app.route('/article/')
def article():
    return redirect(url_for('posts'))

from flask import abort

@app.route('/i-love/<obj>')
def ilove(obj):
    if obj=='shit':
        abort(404)
    return '<h1>I love %s</h1>' % obj