新手请教，抄 BeProud 的教程实例的，运行 load_data 却没有数据也没报错，什么情况 在 Ubuntu 上的 python2.7.3 和 windows 的 python3.6.32 环境中都不行，代码如下：

[code] #coding:utf-8 import shelve

from flask import Flask, request, render_template, redirect, escape, Markup from datetime import datetime

application = Flask(name)

DATA_FILE = 'guestbook.dat'

def save_data(name,comment,create_at): """ Save the comment data """ #open the shelve module database File

database = shelve.open(DATA_FILE)
#if there is no greeting list in database, create it.
if 'greeting_list' not in database:
	greeting_list = []
else:
	#get the greeting_list from database
	greeting_list = database['greeting_list']

	#append the data into the list top
	greeting_list.insert(0, {
	'name':name,
	'comment':comment,
	'create_at':create_at,
	})

	# update the database
	database['greeting_list'] = greeting_list

	#close the database file
	database.close()

def load_data(): """ Return the comment data saved before """ #open the shelve module database file database = shelve.open(DATA_FILE)

#get the greeting_list. if not ,just return empty list.
greeting_list = database.get('greeting_list',[])

database.close()
return greeting_list

@application.route('/') def index(): """ Top page Use template to show the page """ greeting_list=load_data() return render_template('index.html',greeting_list=greeting_list)

@application.route('/post',methods=['POST']) def post(): """ Comment's target url """ # get the comment data name = request.form.get('name') comment = request.form.get('comments') create_at = datetime.now() save_data(name, comment, create_at) #rediret to the top page return redirect('/')

if name== 'main': #Run the application when the IP address is 0.0.0.0 and the port is 8000

application.run('0.0.0.0',8000,debug=True)

[/code]