Python使用xslt提取网页数据

from urllib import request
from lxml import etree
import timexslt_root = etree.XML("""\
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
<xsl:template match="/">
<列表>
<xsl:apply-templates select="//*[@id='forum' and count(./table/tbody/tr[position()>=1 and count(.//*[@class='topic']/a/text())>0])>0]" mode="列表"/>
</列表>
</xsl:template><xsl:template match="table/tbody/tr[position()>=1]" mode="list">
<item>
<标题>
<xsl:value-of select="*//*[@class='topic']/a/text()"/>
<xsl:value-of select="*[@class='topic']/a/text()"/>
<xsl:if test="@class='topic'">
<xsl:value-of select="a/text()"/>
</xsl:if>
</标题>
<回复数>
<xsl:value-of select="*//*[@class='replies']/text()"/>
<xsl:value-of select="*[@class='replies']/text()"/>
<xsl:if test="@class='replies'">
<xsl:value-of select="text()"/>
</xsl:if>
</回复数>
</item>
</xsl:template><xsl:template match="//*[@id='forum' and count(./table/tbody/tr[position()>=1 and count(.//*[@class='topic']/a/text())>0])>0]" mode="列表">
<item>
<list>
<xsl:apply-templates select="table/tbody/tr[position()>=1]" mode="list"/>
</list>
</item>
</xsl:template>
</xsl:stylesheet>""")baseurl="http://www.sina.com/cn/forum/7" #由于博客园的限制，如果你要运行该代码的话，将'sina'替换成'gooseeker‘
basefilebegin="jsk_bbs_"
basefileend=".xml"
count=1
while (count < 12):
url=baseurl + "?page=" + str(count)
conn=request.urlopen(url)
doc = etree.HTML(conn.read())
transform = etree.XSLT(xslt_root)
result_tree = transform(doc)
print(str(result_tree))
file_obj=open(basefilebegin+str(count)+basefileend,'w',encoding='UTF-8')
file_obj.write(str(result_tree))
file_obj.close()
count+=1
time.sleep(2)