python之网站需要在 python 中更新

我正在大修的网站目前使用的是 python 2.3.7，并且使用 Google App Engine 进行管理，它必须更新到 2.7，并且由于新版本的功能，模板部分已贬值。需要对此进行哪些必要的更改？仅供引用，我是一名为聊天室网站做这件事的高中生。当我重写 app.yaml 的更改时，更改 .py 中的代码(然后我将文件重命名为 .app)，它会抛出此回溯错误。帮助？

File "/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 196, in Handle 
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler()) 
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 255, in _LoadHandler 
    handler = __import__(path[0]) 
ImportError: No module named devchat 

我的导入是

import cgi 
import os 
import urllib 
import logging 
 
from google.appengine.api import users 
from google.appengine.ext import webapp 
from google.appengine.ext.webapp.util import run_wsgi_app 
from google.appengine.ext import db 
from google.appengine.ext.webapp import template 
from google.appengine.api import memcache 

关于模板的部分代码在这里

class BaseRequestHandler(webapp.RequestHandler): 
 
  def generate(self, template_name, template_values={}):  
    # We check if there is a current user and generate a login or logout URL 
    user = users.get_current_user() 
 
    if user: 
      log_in_out_url = users.create_logout_url('/') 
    else: 
      log_in_out_url = users.create_login_url(self.request.path) 
 
    # We'll display the user name if available and the URL on all pages 
    values = {'user': user, 'log_in_out_url': log_in_out_url} 
    values.update(template_values) 
 
    # Construct the path to the template 
    directory = os.path.dirname(__file__) 
    path = os.path.join(directory, 'templates', template_name) 
 
    # Respond to the request by rendering the template 
    self.response.out.write(template.render(path, values, debug=_DEBUG)) 
 
class MainRequestHandler(BaseRequestHandler): 
  def get(self): 
    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' 
 
    template_values = { 
      'url': url, 
      'url_linktext': url_linktext, 
      } 
 
    self.generate('index.html', template_values); 
 
class ChatsRequestHandler(BaseRequestHandler): 
  def renderChats(self): 
    greetings_query = Greeting.all().order('date') 
    greetings = greetings_query.fetch(1000) 
 
    template_values = { 
      'greetings': greetings, 
    } 
    return self.generate('chats.html', template_values) 
 
  def getChats(self, useCache=True): 
    if useCache is False: 
      greetings = self.renderChats() 
      if not memcache.set("chat", greetings, 10): 
        logging.error("Memcache set failed:") 
      return greetings 
 
    greetings = memcache.get("chats") 
    if greetings is not None: 
      return greetings 
    else: 
      greetings = self.renderChats() 
      if not memcache.set("chat", greetings, 10): 
        logging.error("Memcache set failed:") 
      return greetings 
 
  def get(self): 
    self.getChats() 
 
  def post(self): 
    greeting = Greeting() 
 
    if users.get_current_user(): 
      greeting.author = users.get_current_user() 
 
    greeting.content = self.request.get('content') 
    greeting.put() 
 
    self.getChats(False)` 

请您参考如下方法:

这是一个非常好的视频，解释了如何更新您的应用程序:https://developers.google.com/events/io/sessions/gooio2012/300/