#!/usr/bin/python3.5
#
from xml.parsers.expat import ParserCreate
class defaultsax(object):
def __init__(self):
self.db = {}
def start_element(self, name, attrs):
print('sax:start_elementname:%s,attrs:%s' % (name,str(attrs)))
def end_element(self, name):
print('sax:end_element:%s' % name)
pass
def char_data(self, text):
print('sax:char_data: %s' % text)
#pass
xml = r'''<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<rss version="2.0" xmlns:yweather="http://xml.weather.yahoo.com/ns/rss/1.0" xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#">
<channel>
<title>Yahoo! Weather - Beijing, CN</title>
<lastBuildDate>Wed, 27 May 2015 11:00 am CST</lastBuildDate>
<yweather:location city="Beijing" region="" country="China"/>
<yweather:units temperature="C" distance="km" pressure="mb" speed="km/h"/>
<yweather:wind chill="28" direction="180" speed="14.48" />
<yweather:atmosphere humidity="53" visibility="2.61" pressure="1006.1" rising="0" />
<yweather:astronomy sunrise="4:51 am" sunset="7:32 pm"/>
<item>
<geo:lat>39.91</geo:lat>
<geo:long>116.39</geo:long>
<pubDate>Wed, 27 May 2015 11:00 am CST</pubDate>
<yweather:condition text="Haze" code="21" temp="28" date="Wed, 27 May 2015 11:00 am CST" />
<yweather:forecast day="Wed" date="27 May 2015" low="20" high="33" text="Partly Cloudy" code="30" />
<yweather:forecast day="Thu" date="28 May 2015" low="21" high="34" text="Sunny" code="32" />
<yweather:forecast day="Fri" date="29 May 2015" low="18" high="25" text="AM Showers" code="39" />
<yweather:forecast day="Sat" date="30 May 2015" low="18" high="32" text="Sunny" code="32" />
<yweather:forecast day="Sun" date="31 May 2015" low="20" high="37" text="Sunny" code="32" />
</item>
</channel>
</rss>
'''
handler = defaultsax()
parser = ParserCreate()
parser.StartElementHandler = handler.start_element
parser.EndElementHandler = handler.end_element
parser.CharacterDataHandler = handler.char_data
parser.Parse(xml)執行之後發現end_element字段沒有什麼有用的信息，所有將其刪除之：
def end_element(self, name):
#print('sax:end_element:%s' % name)
pass爲了方便分析，char_data字段也先不顯示：
def char_data(self, text):
print('sax:char_data: %s' % text)
#pass改好後，執行腳本，獲得以下內容（只截取一部分）：
很明顯，name的內容也沒有我們需要的內容，不過要根據name對不同行內容做處理，attrs是我們需要的真正內容，attrs顯示的格式明顯是字典，這時就可以利用字典的key得到我們想要的，更改start_element段代碼並增加__init__段：
def __init__(self):
self.weater = {} #定義一個空字典
def start_element(self, name, attrs):
self.weater['na'] = name
if self.weater['na'] == 'yweather:location': #對name=yweather:location行的attrs做處理
print('國家：%s,城市:%s' % (attrs['country'],attrs['city']))保存並執行腳本：
然後根據需要，對每個行做相應的截取，最後得到自己想要的。