在GAE中导入模型文件中的类时出现问题

Question

我刚接触Python，最近学习了一些关于Python和Google App Engine的知识，现在开始做一个试点项目。我已经把两个实体UserDetails和PhoneBook的数据批量上传到应用引擎上。现在在我的用户界面中，我首先想输入用户名，然后查询UserDetails来获取用户ID，再用这个用户ID去查询PhoneBook，获取他的电话簿条目。以下是我用户界面的代码：

#!/usr/bin/env python

import wsgiref.handlers
from google.appengine.ext import db
from google.appengine.ext import webapp
from google.appengine.ext.webapp import template
from models import UserDetails,PhoneBook
#import models

class showPhoneBook(db.Model):
    """ class to store the user_name to db """
    user_name = db.StringProperty(required=True)

class MyHandler(webapp.RequestHandler):
    def get(self):
        """ Query type 1 """
        #p = db.GqlQuery('SELECT * FROM UserDetails WHERE user_name = :1', user_name)

        """ Query type 2 """
        #p = UserDetails.gql('WHERE user_name = :1', user_name)

        """ Query type 3 """
        p = UserDetails.all().filter('user_name = ', user_name)
        result1 = p.get()
        for itr1 in result1:
            userId = itr.user_id

        """ Query type 1 """    
        #q = db.GqlQuery('SELECT * FROM PhoneBook WHERE user_id = :1', userId)

        """ Query type 2 """
        #q = PhoneBook.gql('WHERE user_id = :1', userId)

        """ Query type 3 """
        q = PhoneBook.all().filter('user_id = ', userId)
        values = {
            'phoneBookValues': q
        }
        self.response.out.write(
            template.render('phonebook.html', values))
    def post(self):
        phoneBookuserID = showPhoneBook(
            user_name = self.request.get('username'))
        phonebookuserID.put()
        self.redirect('/')

def main():
    app = webapp.WSGIApplication([
        (r'.*',MyHandler)], debug=True)
    wsgiref.handlers.CGIHandler().run(app)

if __name__ == "__main__":
    main()

问题是，我在日志中看到一个错误，GAE无法从模型中导入UserDetails和PhoneBook类。

<type 'exceptions.ImportError'>: cannot import name UserDetails
Traceback (most recent call last):
  File "/base/data/home/apps/bulkloader160by2/1-4.337299749289926105/main.py", line 7, in <module>
    from models import UserDetails,PhoneBook

当我把from models import UserDetails, PhoneBook这行去掉，改成import models时，我又遇到了另一个问题：

global name 'UserDetails' is not defined
Traceback (most recent call last):
  File "/base/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 507, in __call__
    handler.get(*groups)
  File "/base/data/home/apps/bulkloader160by2/1-4.337300095868541686/main.py", line 19, in get
    p = UserDetails.all().filter('user_name = ', user_name)
NameError: global name 'UserDetails' is not defined

这是我的models.py文件，在这里我定义了UserDetails和PhoneBook类。我把这个文件放在了根目录下。

#!/usr/bin/env python

from google.appengine.ext import db

#Table structure of User Details table
class UserDetails(db.Model):
  user_id = db.IntegerProperty(required = True)
  user_name = db.StringProperty(required = True)
  mobile_number = db.PhoneNumberProperty(required = True)

#Table structure of Phone Book table
class PhoneBook(db.Model):
  contact_id = db.IntegerProperty(required=True)
  user_id = db.IntegerProperty(required=True)
  contact_name = db.StringProperty(required=True)
  contact_number = db.PhoneNumberProperty(required=True)

因为我对Python还很陌生，所以我搞不清楚为什么无法从models.py文件中导入我的类，以及如何在post(self)和get(self)之间设置或获取用户名。

如果我说得不对，请多多包涵，但如果你能帮我解决这个问题，我会非常感激。

谢谢！

错误处理 gae 用户界面 google app engine 模型类数据导入 userdetails phonebook

在GAE中导入模型文件中的类时出现问题

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