python - 如何实现 python 来查找 xml 标签之间的值？

Question

我正在使用谷歌网站检索天气信息，我想在 XML 标签之间查找值。以下代码给出了一个城市的天气状况，但我无法获得其他参数，例如温度，如果可能的话，请解释代码中隐含的拆分功能的工作原理:

import urllib

def getWeather(city):

    #create google weather api url
    url = "http://www.google.com/ig/api?weather=" + urllib.quote(city)

    try:
        # open google weather api url
        f = urllib.urlopen(url)
    except:
        # if there was an error opening the url, return
        return "Error opening url"

    # read contents to a string
    s = f.read()

    # extract weather condition data from xml string
    weather = s.split("<current_conditions><condition data=\"")[-1].split("\"")[0]

    # if there was an error getting the condition, the city is invalid


    if weather == "<?xml version=":
        return "Invalid city"

    #return the weather condition
    return weather

def main():
    while True:
        city = raw_input("Give me a city: ")
        weather = getWeather(city)
        print(weather)

if __name__ == "__main__":
    main()

谢谢

Answer 1

USE

A

PARSER

您不能使用正则表达式解析 XML，所以不要尝试。这是一个 start to finding an XML parser in Python .这是一个 good site for learning about parsing XML in Python .

更新:鉴于有关 PyS60 的新信息，这里是 documentation for using XML来自诺基亚的网站。

更新 2:@Nas Banov 请求了示例代码，所以这里是:

import urllib

from xml.parsers import expat

def start_element_handler(name, attrs):
    """
    My handler for the event that fires when the parser sees an
    opening tag in the XML.
    """
    # If we care about more than just the temp data, we can extend this
    # logic with ``elif``. If the XML gets really hairy, we can create a
    # ``dict`` of handler functions and index it by tag name, e.g.,
    # { 'humidity': humidity_handler }
    if 'temp_c' == name:
        print "The current temperature is %(data)s degrees Celsius." % attrs

def process_weather_conditions():
    """
    Main logic of the POC; set up the parser and handle resource
    cleanup.
    """
    my_parser = expat.ParserCreate()
    my_parser.StartElementHandler = start_element_handler

    # I don't know if the S60 supports try/finally, but that's not
    # the point of the POC.
    try:
        f = urllib.urlopen("http://www.google.com/ig/api?weather=30096")
        my_parser.ParseFile(f)
    finally:
        f.close()

if __name__ == '__main__':
    process_weather_conditions()