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我正在通过 GAE 教程工作，但出现以下错误。

文件“/Users/cparrish/bin/guestbook/guestbook.py”，第 62 行，在问候中获取问候：NameError：未定义全局名称“问候”

所以我认为问题出在某个地方。

 greetings_query = Greeting.query(
                     ancestor = guestbook_key(guestbook_name)).order(-Greeting.date)

    greeetings = greetings_query.fetch(10)

    for greeting in greetings:
        if greeting.author:
            self.response.write(
                    '<b>%s</b> wrote:' % greeting.author.nickname())

这是第 58 - 66 行所以我想知道是否有其他人可以看到我在这里显然缺少的内容。

完整的代码库如下。

import cgi 
import urllib


from google.appengine.api import users
from google.appengine.ext import ndb

import webapp2

MAIN_PAGE_FOOTER_TEMPLATE = """\
    <form action="/sign?%s" method="post">
        <div><textarea name="content" rows="3" cols="60"></textarea></div>
        <div><input type="submit" value="Sign Guestbook"></div>
    </form>

    <hr>

    <form>Guestbook name:
        <input value="%s" name="guestbook_name">
        <input type="submit" value="switch">
    </from>

    <a href="%s">%s</a>


    </body>
</html>
"""

DEFAULT_GUESTBOOK_NAME = 'default_guestbook'

# We set a parent key on the 'Greetings' to ensure that they are all in the same
# entity group. Queries across the signle entity group will be consistent. 
# However, the write rate should be limited to -1/second. 

def guestbook_key(guestbook_name="DEFAULT_GUESTBOOK_NAME"):
    """ Constructs a Datastore key for a Guestbook entity with guestbook_name. """
    return ndb.Key('Guestbook', guestbook_name)


class Greeting(ndb.Model):
    """Models an individual Guestbook entry with author, content, and date. """
    author  = ndb.UserProperty()
    content = ndb.StringProperty( indexed = False )
    date    = ndb.DateTimeProperty( auto_now_add = True )

class MainPage(webapp2.RequestHandler):

    def get(self):
        self.response.write('<html><body>')
        guestbook_name = self.request.get('guestbook_name', DEFAULT_GUESTBOOK_NAME)

        # Ancestor Queries, as shown here, are strongly consisten with the High
        # Replication Datastore. Queries that span entity groups are eventually
        # consisten. If we omitted the ancestor from this query there would be
        # a slight chance that Greetings that had just been written would not
        # show up in a query. 
        greetings_query = Greeting.query(
                         ancestor = guestbook_key(guestbook_name)).order(-Greeting.date)

        greeetings = greetings_query.fetch(10)

        for greeting in greetings:
            if greeting.author:
                self.response.write(
                        '<b>%s</b> wrote:' % greeting.author.nickname())
            else:
                self.response.write('An anonymous person wrote:')
            self.response.write('<blockquote>%s</blockquote' %
                                cgi.escape(greeting.content))

            if users.get_current_user():
                url = users.create_logout_url(self.request.uri)
                url_linktext = 'Logout'
            else:
                url = users.create_login_url(self.request.uri)
                url_linktext = 'Login'

            # Write the submission form and the footer of the page
            sign_query_parms = urllib.urlencode({'guestbook_name': guestbook_name})
            self.response.write(MAIN_PAGE_FOOTER_TEMPLATE % (sign_query_parms, cgi.escape(guestbook_name), url, url_linktext))

class Guestbook(webapp2.RequestHandler):

        def post(self):
            # We set the same parent key on the 'Greeting' to ensure each getting
            # is in the same entity group. Queries across the single entity group
            # will be consistent. However, the write reate to a sing entity groupo
            # should be limited to ~1/second.     
            guestbook_name  = self.request.get('guestbook_name',
                                                 DEFAULT_GUESTBOOK_NAME)
            greeting        = Greeting(parent=guestbook_key(guestbook_name))

            if users.get_current_user():
                greeting.author = users.get_current_user()

            greeting.content = self.request.get('content')
            greeting.put()

            query_params = {'guestbook_name': guestbook_name}
            self.redirect('/?' + urllib.urlencode(query_params))


application = webapp2.WSGIApplication([
    ('/', MainPage),
    ('/sign', Guestbook),
], debug=True)
4

1 回答 1

3

e你的作业中有 3个greeetings。

greeetings = greetings_query.fetch(10)

for greeting in greetings:

这些es 中的一个与其他 s 不同，其中一个e不属于...

于 2013-05-22T04:40:49.503 回答