flask 自定义404，500页面

from flask import Flask
 from flask import abort
 from flask import render_template
app = Flask(name)
@app.errorhandler(404)
 def page_not_found(e):
 return render_template('404.html'),404
 @app.errorhandler(500)
 def page_not_found(e):
 return render_template('500.html'),500
@app.route('/')
 def index():
 abort(404)
if name == 'main':
 app.run()