Python lxml - 查找标签 block 修正

Question

我已经打开并解析了下面的 xml，现在需要找到区域为“IE”的特定产品 block ，然后修改其“cleared_for_sale”和“wholesale_price_tier”值，但我不确定如何操作。这是不起作用的:

a = 0
territory = "IE"
for products22 in tree.xpath("//video/products/product"):
    node_video_temp = tree.xpath('//video/products/product')[a]
    if root.iterfind(node_video_temp, territory):
        ## Update the values ##
    a +=1

这是 xml:

<?xml version="1.0" encoding="UTF-8"?>
<package xmlns="http://apple.com/itunes/importer" version="film5.0">
    <video>
        <products>
            <product>
                <territory>GB</territory>
                <cleared_for_sale>true</cleared_for_sale>
                <wholesale_price_tier>1</wholesale_price_tier>
            </product>
            <product>
                <territory>IE</territory>
                <cleared_for_sale>true</cleared_for_sale>
                <wholesale_price_tier>1</wholesale_price_tier>
            </product>
            <product>
                <territory>US</territory>
                <cleared_for_sale>true</cleared_for_sale>
                <wholesale_price_tier>1</wholesale_price_tier>
            </product>
        </products>
    </video>
</package>

Answer 1

您可以创建一个 xpath 表达式来获取 territory 为 IE 的所有产品:

//product[territory = "IE"]

但是，您需要 handle an empty namespace这里:

from lxml import etree

data = """<?xml version="1.0" encoding="UTF-8"?>
<package xmlns="http://apple.com/itunes/importer" version="film5.0">
    <video>
        <products>
            <product>
                <territory>GB</territory>
                <cleared_for_sale>true</cleared_for_sale>
                <wholesale_price_tier>1</wholesale_price_tier>
            </product>
            <product>
                <territory>IE</territory>
                <cleared_for_sale>true</cleared_for_sale>
                <wholesale_price_tier>1</wholesale_price_tier>
            </product>
            <product>
                <territory>US</territory>
                <cleared_for_sale>true</cleared_for_sale>
                <wholesale_price_tier>1</wholesale_price_tier>
            </product>
        </products>
    </video>
</package>
"""

ns = {"x": "http://apple.com/itunes/importer"}
territory = 'IE'

root = etree.fromstring(data)
for product in root.xpath('//x:product[x:territory = "%s"]' % territory, namespaces=ns):
    print product.findtext('x:cleared_for_sale', namespaces=ns)
    print product.findtext('x:wholesale_price_tier', namespaces=ns)

打印cleared_for_sale和wholesale_price_tier for Territory =“IE”:

true
1