0

该脚本仅获取一个站的天气信息。我想获取链接中列出的所有内容，并将值写入具有以下脚本格式的文件。

#! /usr/bin/python

#import module to open urls
from urllib import urlopen

#import module to parse xml
import xml.etree.ElementTree as ET

#settings
airport = 'KORF,KPHF,KRIC,KDCA,KIAD,KADW,KBWI,KACY,KPHL,KMDT,KPIT,KEWR,KJFK,KLGA,KBOS'

#open xml file
xml_link = urlopen('http://weather.aero/dataserver_current/httpparam?dataSource=metars&requestType=retrieve&format=xml&hoursBeforeNow=1&stationString=KORF,KPHF,KRIC,KDCA,KIAD,KADW,KBWI,KACY,KPHL,KMDT,KPIT,KEWR,KJFK,KLGA,KBOS')

#parse data and assign root to element tree module
tree = ET.parse(xml_link)
root = tree.getroot()

#search for data under <data> and <METAR> tags
data = root.findall('data/METAR')

for metar in data:
    raw_text = metar.find('raw_text').text
    station = metar.find('station_id').text
    category = metar.find('flight_category').text

    file = open('metar.txt', 'w')
    file.write("%s is now reporting %s condition:" % (station, category))
    file.write("\n%s" %raw_text)
    file.close()
4

1 回答 1

2

正如此评论中所解释的，您的问题不在于您如何迭代 XML 值，而在于您metar.txt每次都在通过循环进行覆盖。

相反，您应该在循环之外打开和关闭文件。该with声明可以在这里为您提供帮助，为您处理结案：

with open('metar.txt', 'w') as f:
    for metar in data:
        raw_text = metar.find('raw_text').text
        station = metar.find('station_id').text
        category = metar.find('flight_category').text

        f.write("%s is now reporting %s condition:" % (station, category))
        f.write("\n%s" %raw_text)

（您也不应该将其file用作文件对象的名称，因为file它是文件对象的内置 Python 类型，如果这样做，您将对其进行隐藏。）

于 2012-10-29T01:49:02.117 回答