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我对 Python 和 GAE 非常陌生，但我正在尝试从 eventful.com api（以 XML 格式）下载 XML 文件，对其进行解析，然后我会将这些信息存储在 Google Cloud SQL 上的数据库中。

到目前为止，我的代码如下，我在查看了各种在线教程后设法编写了这些代码，但是我不断收到很多错误，并且代码对我根本不起作用。如果有人对我哪里出错有任何指示，请告诉我，凯伦。

我尝试调用多事的 xml 文件并对其进行解析：

import webapp2
from google.appengine.ext.webapp import template
import os
import datetime
from google.appengine.ext import db
from google.appengine.api import urlfetch
import urllib #import python library which does http requests
from xml.dom import parseString #imports xml parser called minidom

class XMLParser(webapp2.RequestHandler):
    def get(self):
        base_url = fetch('http://api.eventful.com/rest/events/search?app_key=zGtDX6cwQ=dublin&?q=music')
        #downloads data from xml file
        response = urllib.urlopen(base_url)
        #converts data to string:
        data = response.read()
        #closes file
        response.close()
        #parses xml downloaded
        dom = parseString(data)
        #retrieves the first xml tag that the parser finds with name tag
        xmlTag = dom.getElementsByTagName('title')[0].toxml()
        #strip off the tag to just reveal event name
        xmlData = xmlTag.replace('<title>', '').replace('</title>', '')
        #print out the xml tag and data in this format:
        print xmlTag
        #just print the data
        print xmlData

当我尝试运行此代码时收到以下错误，但是在 Google App Engine 用户 GAE 启动器中 -

2013-04-15 16:52:05 Running command: "['C:\\Python27\\python.exe', 'C:\\Program Files     (x86)\\Google\\google_appengine\\dev_appserver.py', '--skip_sdk_update_check=yes', '--port=8080', '--admin_port=8002', u'C:\\Users\\Karen\\Desktop\\Development\\own_tada']"
INFO     2013-04-15 16:52:17,944 devappserver2.py:498] Skipping SDK update check.
WARNING  2013-04-15 16:52:18,005 api_server.py:328] Could not initialize images API;     you are likely missing the Python "PIL" module.
INFO     2013-04-15 16:52:18,065 api_server.py:152] Starting API server at:      http://localhost:54619
INFO     2013-04-15 16:52:18,085 dispatcher.py:150] Starting server "default" running     at: http://localhost:8080
INFO     2013-04-15 16:52:18,095 admin_server.py:117] Starting admin server at: http://localhost:8002
ERROR    2013-04-15 15:52:35,767 wsgi.py:219] 
Traceback (most recent call last):
  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 196, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 255, in _LoadHandler
    handler = __import__(path[0])
  File "C:\Users\Karen\Desktop\Development\own_tada\own.py", line 8, in <module>
    from xml.dom import parseString #imports xml parser called minidom
ImportError: cannot import name parseString
INFO     2013-04-15 16:52:35,822 server.py:561] default: "GET / HTTP/1.1" 500 -
ERROR    2013-04-15 15:52:37,586 wsgi.py:219] 
Traceback (most recent call last):
  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 196, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 255, in _LoadHandler
    handler = __import__(path[0])
  File "C:\Users\Karen\Desktop\Development\own_tada\own.py", line 8, in <module>
    from xml.dom import parseString #imports xml parser called minidom
 ImportError: cannot import name parseString
INFO     2013-04-15 16:52:37,617 server.py:561] default: "GET /favicon.ico HTTP/1.1" 500 -

我用于上述代码的一个此类教程来自以下 URL：http ://www.travisglines.com/web-coding/python-xml-parser-tutorial

编辑：

感谢下面 Josh 提供的帮助，当我使用我的代码启动我的代码时，我现在没有收到任何错误，但是我只看到一个空白屏幕并希望它打印出解析的信息（或到目前为止的进度）。我知道这似乎是一个非常愚蠢的问题，但我真的是一个初学者，所以我很抱歉！固定代码（减去错误）是：

import webapp2
from google.appengine.ext.webapp import template
import os
import datetime
from google.appengine.ext import db
from google.appengine.api import urlfetch
import urllib #import python library which does http requests
import xml.dom.minidom as mdom #imports xml parser called minidom

class XMLParser(webapp2.RequestHandler):
    def get(self):
    base_url = 'http://api.eventful.com/rest/events/search?app_key=zGtDX6cwQjCRdkf6&l=dublin&?q=music'
    #downloads data from xml file
    response = urllib.urlopen(base_url)
    #converts data to string:
    data = response.read()
    #closes file
    response.close()
    #parses xml downloaded
    dom = mdom.parseString(data)
    #retrieves the first xml tag that the parser finds with name tag
    xmlTag = dom.getElementsByTagName('title')[0].toxml()
    #strip off the tag to just reveal event name
    xmlData = xmlTag.replace('<title>', '').replace('</title>', '')
    #print out the xml tag and data in this format:
    print xmlTag
    #just print the data
    print xmlData

app = webapp2.WSGIApplication([('/', XMLParser), 
                          ],
                          debug=True)

任何关于下一步做什么的指导将不胜感激，或者任何你能发现的我的 python 代码有问题，谢谢！

4

2 回答 2

2

Appengine 支持lxml ，包含它并用它解析您的文档非常简单。

在您的 app.yaml 文件中

libraries:
    - name: lxml
    - version: latest

然后import lxml按照解析说明进行操作

于 2013-04-16T12:41:56.470 回答
1

这应该可以解决您的导入问题

import xml.dom.minidom as mdom

并解析原始数据：

dom = mdom.parseString(data)

至于数据操作，您将要查看从 parseString 返回的子节点和数据元素。

如：

for element in dom.getElementsByTagName('title')[0].childnodes:
    print element.data

解析结构后查看结构。

于 2013-04-15T16:15:06.620 回答