XPath
De aktuelle dataene er ordnet i en XML-fil: all_results.xml
Kopier datafila og pythonkoden nedenfor og eksperimenter.
Eksempel
"""
working with XPATH
"""
from lxml import etree
"""
all athlets on 100m in all olympics
"""
def testing1():
xmlfile='../lxml/all_results.xml'
tree=etree.parse(xmlfile)
rot=tree.getroot()
print ("-------- 100m athlets ------------")
names= rot.xpath("//event[@dist='100m']/athlet/name")
for n in names:
print (n.text)
"""
all athlets on 100m in all olympics
grouped on place
"""
def testing2():
xmlfile='../lxml/all_results.xml'
tree=etree.parse(xmlfile)
rot=tree.getroot()
print ("-------- 100m athlets ------------")
events= rot.xpath("//event[@dist='100m']")
for e in events:
# parent ..
print (e.xpath("../@place")[0])
athlets=e.xpath("athlet")
for a in athlets:
print ("\t\t"+a.xpath("name")[0].text)
"""
all athlets on a named distance in all olympics
grouped on place
"""
def testing3(distance):
xmlfile='../lxml/all_results.xml'
tree=etree.parse(xmlfile)
rot=tree.getroot()
print ("-------- %s athlets ------------"%distance)
xp="//event[@dist='%s']"%distance
events= rot.xpath(xp)
for e in events:
# parent ..
print (e.xpath("../@place")[0])
athlets=e.xpath("athlet")
for a in athlets:
print ("\t\t"+a.xpath("name")[0].text)
"""
all athlets on a named distance in a named olympics
"""
def testing4(place,distance):
xmlfile='../lxml/all_results.xml'
tree=etree.parse(xmlfile)
rot=tree.getroot()
print ("-------- %s athlets in %s------------"%(distance,place))
xp="//OlympicGame[@place='%s']/event[@dist='%s']/athlet/name"%(place,distance)
names= rot.xpath(xp)
for n in names:
print (n.text)
testing1()
testing2()
testing3('400m')
testing4('Beijing','200m')
