在python中解析yahoo weather xml时出错

Question

我一直在寻找解决方案，所以我想在我的数据库中获取位置ID的天气信息，它意味着使用模型中的location_id并将信息存储在天气日志中我的数据库中的模型这是代码和错误如下：

 ![# -*- coding: UTF-8 -*-
    import urllib
    from xml.dom import minidom
    from xml.dom.minidom import parse
    from argparse import ArgumentParser
    from pprint import pprint
    from datetime import datetime

    from django.db import models
    from django.core.management.base import NoArgsCommand

    Location = models.get_model("weatherapp", "Location")
    WeatherLog = models.get_model("weatherapp", "WeatherLog")

    SILENT, NORMAL, VERBOSE = 0, 1, 2

    WEATHER_URL = 'http://weather.yahooapis.com/forecastrss?p=%s&u=c'
    METRIC_PARAMETER = ''
    WEATHER_NS = "http://xml.weather.yahoo.com/ns/rss/1.0"

    def weather_for_location(location_id, options):
        # taken from http://developer.yahoo.com/python/python-xml.html
        # and modified a little
        url = WEATHER_URL % location_id


        try:
            dom = minidom.parse(urllib.urlopen(url))
        except Exception:
            return None


     # Get the units of the current feed.
        yunits = dom.getElementsByTagNameNS(WEATHER_NS, 'units') \[0\]


        # Get the location of the specified location code.
        ylocation = dom.getElementsByTagNameNS(WEATHER_NS, 'location') \[0\]

        # Get the current conditions.
        ycondition = dom.getElementsByTagNameNS(WEATHER_NS, 'condition') \[0\]

        forecasts = \[\]
        for node in enumerate( dom.getElementsByTagNameNS(WEATHER_NS, 'forecast')):
               forecasts.append({
                    'date': node.getAttribute('date'),
                    'low': node.getAttribute('low'),
                    'high': node.getAttribute('high'),
                    'condition': node.getAttribute('text')
               })

        return {
            'current_condition': ycondition.getAttribute('text'),
            'current_temp': ycondition.getAttribute('temp'),
            'current_humidity': yatmosphere.getAttribute('humidity'),
            'current_visibility': yatmosphere.getAttribute('visibility'),
            'current_wind_speed': ywind.getAttribute('speed'),
            'forecasts': forecasts,
            'title': dom.getElementsByTagName('title')\[0\].firstChild.data,
            'guid': dom.getElementsByTagName('guid')\[0\].firstChild.data,
        }            

    class Command(NoArgsCommand):
        help = "Aggregates data from weather feed"
        def handle_noargs(self, **options):
            verbosity = int(options.get('verbosity', NORMAL))

            created_count = 0
            for l in Location.objects.all():
                weather = weather_for_location(l.location_id, options)
                if verbosity > NORMAL:
                    pprint(weather)
                timestamp_parts = map(int, weather\['guid'\].split("_")\[1:-1\])
                timestamp = datetime(*timestamp_parts)
                log, created = WeatherLog.objects.get_or_create(
                     location=l,
                     timestamp=timestamp,
                     defaults={
                        'temperature': weather\['current_temp'\],
                        'humidity': weather\['current_humidity'\],
                        'wind_speed': weather\['current_wind_speed'\],
                        'visibility': weather\['current_visibility'\],
                        }
                     )
                if created:
                    created_count += 1
            if verbosity > NORMAL:
                print "New weather logs: %d" % created_count][1]

错误：

> File
> "/home/temi/rapidsmstuts/myapp/weatherapp/management/commands/check_weather.py",
> line 74, in handle_noargs
>     timestamp_parts = map(int, weather['guid'].split("_")[1:-1]) TypeError: 'NoneType' object has no attribute '__getitem__'


File "/home/temi/rapidsmstuts/myapp/weatherapp/management/commands/check_weather.py", line 47, in weather_for_location
    'date': node.getAttribute('date'),
AttributeError: 'tuple' object has no attribute 'getAttribute'




File "/home/temi/rapidsmstuts/myapp/weatherapp/management/commands/check_weather.py", line 35, in weather_for_location
    yunits = dom.getElementsByTagNameNS(WEATHER_NS, 'units') [0]
IndexError: list index out of range