Question

对于此xml，

 xmldata="""
    <locations>

    <continent region="Africa" >
        <country id="84" countryname="Algeria" ></country>
    </continent>

    <continent region="Asia" >
        <country id="84" countryname="India" ></country>
    </continent>

    <continent region="America" >
        <country id="84" countryname="Mexico" ></country>
    </continent>

</locations>
"""

我正在尝试使用国家/地区名称获取地区名称，如果国家/地区名称为India，则代码应返回Asia。

我尝试了什么，

import lxml.etree as ET
root = ET.fromstring(xmldata)
flag=False
continent=""
country=""
for neighbor in root.iter('continent'):
    for i in neighbor.iter("country"):
        if i.attrib.get('countryname')=="India":
            flag=True
            continent=neighbor.attrib.get('region')
            country=i.attrib.get('countryname')
    if flag==True:
        break
print 'Continent is ',continent , 'And country is ', country

此代码有效，但执行此操作并不方便。

如何使用xpath表达式实现此目的？

Answer 1

使用//continent[./country/@countryname="India"]/@region xpath表达式：

>>> import lxml.etree as ET
>>> xmldata="""
... <locations>
... 
... <continent region="Africa" >
...     <country id="84" countryname="Algeria" ></country>
... </continent>
... 
... <continent region="Asia" >
...     <country id="84" countryname="India" ></country>
... </continent>
... 
... <continent region="America" >
...     <country id="84" countryname="Mexico" ></country>
... </continent>
... 
... </locations>
... """
>>> root = ET.fromstring(xmldata)
>>> print root.xpath('//continent[./country/@countryname="India"]/@region')
['Asia']

使用子节点lxml python获取父节点

1 个答案: