Fatal编程技术网
  • python/
  • Python 使用“选择”访问孙辈

Python 使用“选择”访问孙辈

python css xml

Python 使用“选择”访问孙辈,python,css,xml,beautifulsoup,Python,Css,Xml,Beautifulsoup,我已经为这个问题挣扎了很长一段时间 给定以下XML文件 <?xml version='1.0' encoding='UTF-8'?> <html> <body> <feed xml:base="https:newrecipes.org" xmlns="http://www.w3.org/2005/Atom" xmlns:d="http

我已经为这个问题挣扎了很长一段时间

给定以下XML文件

<?xml version='1.0' encoding='UTF-8'?>
<html>
    <body>
        <feed xml:base="https:newrecipes.org"
            xmlns="http://www.w3.org/2005/Atom"
            xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices"
            xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
            <id>https://recipes.com</id>
            <title>Cuisine</title>
            <updated>2020-08-10T08:48:56.800Z</updated>
            <link href="Cuisine" rel="self" title="Cuisine"/>
            <entry>
                <id>https://www.cuisine.org(53198770598313985)</id>
                <category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="DefaultNamespace.Cuisine"></category>
                <title></title>
                <updated>1970-01-01T00:00:00.000Z</updated>
                <content type="application/xml">
                    <m:properties>
                        <d:id m:type="Edm.Int64">53198770598313985</d:id>
                        <d:name m:type="Edm.String">American</d:name>
                    </m:properties>
                </content>
            </entry>
            <entry>
                <id>https://www.cuisine.org(53198770598313986)</id>
                <category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="DefaultNamespace.Cuisine"></category>
                <title></title>
                <updated>1970-01-01T00:00:00.000Z</updated>
                <content type="application/xml">
                    <m:properties>
                        <d:id m:type="Edm.Int64">53198770598313986</d:id>
                        <d:name m:type="Edm.String">Asian</d:name>
                    </m:properties>
                </content>
            </entry>
        </feed>
      </body>
     </html>
这将返回文件中位于标记括号内的所有ID。但我还想访问每个条目中的属性。因为它们包含菜肴的id和名称，而不需要任何解析。 不幸的是，使用css中的childcombinator>我无法深入，我想知道除了迭代元素以提取值之外，是否还有更好的方法。比如：

cuisine_ids_unparsed = xml_soup.select("entry > content > properties > id")
检索所有ID和

cuisine_names_unparsed = xml_soup.select("entry > content > properties > name")
检索所有名称。

您可以使用zip函数将两个标记绑定在一起：

import re
from bs4 import BeautifulSoup


txt = '''<?xml version='1.0' encoding='UTF-8'?>
<html>
    <body>
        <feed xml:base="https:newrecipes.org"
            xmlns="http://www.w3.org/2005/Atom"
            xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices"
            xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
            <id>https://recipes.com</id>
            <title>Cuisine</title>
            <updated>2020-08-10T08:48:56.800Z</updated>
            <link href="Cuisine" rel="self" title="Cuisine"/>
            <entry>
                <id>https://www.cuisine.org(53198770598313985)</id>
                <category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="DefaultNamespace.Cuisine"></category>
                <title></title>
                <updated>1970-01-01T00:00:00.000Z</updated>
                <content type="application/xml">
                    <m:properties>
                        <d:id m:type="Edm.Int64">53198770598313985</d:id>
                        <d:name m:type="Edm.String">American</d:name>
                    </m:properties>
                </content>
            </entry>
            <entry>
                <id>https://www.cuisine.org(53198770598313986)</id>
                <category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="DefaultNamespace.Cuisine"></category>
                <title></title>
                <updated>1970-01-01T00:00:00.000Z</updated>
                <content type="application/xml">
                    <m:properties>
                        <d:id m:type="Edm.Int64">53198770598313986</d:id>
                        <d:name m:type="Edm.String">Asian</d:name>
                    </m:properties>
                </content>
            </entry>
        </feed>
      </body>
</html>'''

soup = BeautifulSoup(txt, 'xml')


for id_, name in zip(soup.select('entry > id'), soup.select('entry > content > m|properties > d|name')):
    print(re.search(r'\((.*?)\)', id_.text).group(1))
    print(name.text)
    print('-' * 80)
您可以使用zip功能将两个标签绑定在一起：

import re
from bs4 import BeautifulSoup


txt = '''<?xml version='1.0' encoding='UTF-8'?>
<html>
    <body>
        <feed xml:base="https:newrecipes.org"
            xmlns="http://www.w3.org/2005/Atom"
            xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices"
            xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
            <id>https://recipes.com</id>
            <title>Cuisine</title>
            <updated>2020-08-10T08:48:56.800Z</updated>
            <link href="Cuisine" rel="self" title="Cuisine"/>
            <entry>
                <id>https://www.cuisine.org(53198770598313985)</id>
                <category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="DefaultNamespace.Cuisine"></category>
                <title></title>
                <updated>1970-01-01T00:00:00.000Z</updated>
                <content type="application/xml">
                    <m:properties>
                        <d:id m:type="Edm.Int64">53198770598313985</d:id>
                        <d:name m:type="Edm.String">American</d:name>
                    </m:properties>
                </content>
            </entry>
            <entry>
                <id>https://www.cuisine.org(53198770598313986)</id>
                <category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="DefaultNamespace.Cuisine"></category>
                <title></title>
                <updated>1970-01-01T00:00:00.000Z</updated>
                <content type="application/xml">
                    <m:properties>
                        <d:id m:type="Edm.Int64">53198770598313986</d:id>
                        <d:name m:type="Edm.String">Asian</d:name>
                    </m:properties>
                </content>
            </entry>
        </feed>
      </body>
</html>'''

soup = BeautifulSoup(txt, 'xml')


for id_, name in zip(soup.select('entry > id'), soup.select('entry > content > m|properties > d|name')):
    print(re.search(r'\((.*?)\)', id_.text).group(1))
    print(name.text)
    print('-' * 80)
使用了一点@Andrej Kesely的建议，但是您可以使用regex执行以下操作，而不是使用zip：

txt = '''<?xml version='1.0' encoding='UTF-8'?>
<html>
    <body>
        <feed xml:base="https:newrecipes.org"
            xmlns="http://www.w3.org/2005/Atom"
            xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices"
            xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
            <id>https://recipes.com</id>
            <title>Cuisine</title>
            <updated>2020-08-10T08:48:56.800Z</updated>
            <link href="Cuisine" rel="self" title="Cuisine"/>
            <entry>
                <id>https://www.cuisine.org(53198770598313985)</id>
                <category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="DefaultNamespace.Cuisine"></category>
                <title></title>
                <updated>1970-01-01T00:00:00.000Z</updated>
                <content type="application/xml">
                    <m:properties>
                        <d:id m:type="Edm.Int64">53198770598313985</d:id>
                        <d:name m:type="Edm.String">American</d:name>
                    </m:properties>
                </content>
            </entry>
            <entry>
                <id>https://www.cuisine.org(53198770598313986)</id>
                <category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="DefaultNamespace.Cuisine"></category>
                <title></title>
                <updated>1970-01-01T00:00:00.000Z</updated>
                <content type="application/xml">
                    <m:properties>
                        <d:id m:type="Edm.Int64">53198770598313986</d:id>
                        <d:name m:type="Edm.String">Asian</d:name>
                    </m:properties>
                </content>
            </entry>
        </feed>
      </body>
</html>'''


xml_soup = BeautifulSoup(txt, features="xml")

properties_unparsed = xml_soup.select('entry > content > m|properties')

for prop in properties_unparsed:
    # Extract the id and name from the text of the property
    # The id is going to be a sequence of numbers
    # the name a sequence of letters.
    tup = re.match(r'(\d+)(\w+)', prop.text).groups()
    id_ = tup[0]
    name = tup[1]
    print(id_, name)
使用了一点@Andrej Kesely的建议，但是您可以使用regex执行以下操作，而不是使用zip：

txt = '''<?xml version='1.0' encoding='UTF-8'?>
<html>
    <body>
        <feed xml:base="https:newrecipes.org"
            xmlns="http://www.w3.org/2005/Atom"
            xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices"
            xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
            <id>https://recipes.com</id>
            <title>Cuisine</title>
            <updated>2020-08-10T08:48:56.800Z</updated>
            <link href="Cuisine" rel="self" title="Cuisine"/>
            <entry>
                <id>https://www.cuisine.org(53198770598313985)</id>
                <category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="DefaultNamespace.Cuisine"></category>
                <title></title>
                <updated>1970-01-01T00:00:00.000Z</updated>
                <content type="application/xml">
                    <m:properties>
                        <d:id m:type="Edm.Int64">53198770598313985</d:id>
                        <d:name m:type="Edm.String">American</d:name>
                    </m:properties>
                </content>
            </entry>
            <entry>
                <id>https://www.cuisine.org(53198770598313986)</id>
                <category scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" term="DefaultNamespace.Cuisine"></category>
                <title></title>
                <updated>1970-01-01T00:00:00.000Z</updated>
                <content type="application/xml">
                    <m:properties>
                        <d:id m:type="Edm.Int64">53198770598313986</d:id>
                        <d:name m:type="Edm.String">Asian</d:name>
                    </m:properties>
                </content>
            </entry>
        </feed>
      </body>
</html>'''


xml_soup = BeautifulSoup(txt, features="xml")

properties_unparsed = xml_soup.select('entry > content > m|properties')

for prop in properties_unparsed:
    # Extract the id and name from the text of the property
    # The id is going to be a sequence of numbers
    # the name a sequence of letters.
    tup = re.match(r'(\d+)(\w+)', prop.text).groups()
    id_ = tup[0]
    name = tup[1]
    print(id_, name)
嗨，安德烈！谢谢你的回复！您使用的是哪个Python版本？因为这部分：soup.select'entry>content>m | properties>d | name'会为我返回一个空列表：/@Jack请确保使用最新版本的bs4和xml解析器。嗨，Andrej！谢谢你的回复！您使用的是哪个Python版本？因为这部分：soup.select'entry>content>m | properties>d | name'为我返回一个空列表：/@Jack请确保使用最新版本的bs4和xml解析器。