python - 在 Python 中查找具有匹配 XML 标记的任何后代的兄弟姐妹

Question

我已经使用 ElementTree 将 XML 文件导入到我的 Python 脚本中。现在，我想找到任何带有“1992”标签的“年份”标签的电影或子电影，然后我想打印该电影或子电影的“评级”值。我对这两个部分感到困惑： 1. 在所有后代中搜索年份标签，而不仅仅是直系子女。2. 搜索一年后返回评分值。年份是评级的兄弟。我不确定如何搜索一个值并返回它的兄弟。

<?xml version='1.0' encoding='UTF-8'?>
<collection>
    <genre category="Action">
        <decade years="1980s">
            <movie favorite="True" title="Indiana Jones: The raiders of the lost Ark">
                <format multiple="No">DVD</format>
                <year>1981</year>
                <rating>PG</rating>
                <description>
                'Archaeologist and adventurer Indiana Jones 
                is hired by the U.S. government to find the Ark of the 
                Covenant before the Nazis.'
                </description>
            </movie>
               <movie favorite="True" title="THE KARATE KID">
               <format multiple="Yes">DVD,Online</format>
               <year>1984</year>
               <rating>PG</rating>
               <description>None provided.</description>
            </movie>
            <movie favorite="False" title="Back 2 the Future">
               <format multiple="False">Blu-ray</format>
               <year>1985</year>
               <rating>PG</rating>
               <description>Marty McFly</description>
            </movie>
        </decade>
        <decade years="1990s">
            <movie favorite="False" title="X-Men">
               <format multiple="Yes">dvd, digital</format>
               <year>2000</year>
               <rating>PG-13</rating>
               <description>Two mutants come to a private academy for their kind whose resident superhero team must 
               oppose a terrorist organization with similar powers.</description>
            </movie>
            <movie favorite="True" title="Batman Returns">
               <format multiple="No">VHS</format>
               <year>1992</year>
               <rating>PG13</rating>
               <description>NA.</description>
            </movie>
               <movie favorite="False" title="Reservoir Dogs">
               <format multiple="No">Online</format>
               <year>1992</year>
               <rating>R</rating>
               <description>WhAtEvER I Want!!!?!</description>
               <submovie>
                    <year>1992</year>
                    <rating>R</rating>
                </submovie>
            </movie>
        </decade>    
    </genre>

    <genre category="Thriller">
        <decade years="1970s">
            <movie favorite="False" title="ALIEN">
                <format multiple="Yes">DVD</format>
                <year>1979</year>
                <rating>R</rating>
                <description>"""""""""</description>
            </movie>
        </decade>
        <decade years="1980s">
            <movie favorite="True" title="Ferris Bueller's Day Off">
                <format multiple="No">DVD</format>
                <year>1986</year>
                <rating>PG13</rating>
                <description>Funny movie about a funny guy</description>
            </movie>
            <movie favorite="FALSE" title="American Psycho">
                <format multiple="No">blue-ray</format>
                <year>2000</year>
                <rating>Unrated</rating>
                <description>psychopathic Bateman</description>
            </movie>
        </decade>
    </genre>

    <genre category="Comedy">
        <decade years="1960s">
            <movie favorite="False" title="Batman: The Movie">
                <format multiple="Yes">DVD,VHS</format>
                <year>1966</year>
                <rating>PG</rating>
                <description>What a joke!</description>
            </movie>
        </decade>
        <decade years="2010s">
            <movie favorite="True" title="Easy A">
                <format multiple="No">DVD</format>
                <year>2010</year>
                <rating>PG--13</rating>
                <description>Emma Stone = Hester Prynne</description>
            </movie>
            <movie favorite="True" title="Dinner for SCHMUCKS">
                <format multiple="Yes">DVD,digital,Netflix</format>
                <year>2011</year>
                <rating>Unrated</rating>
                <description>Tim (Rudd) is a rising executive
                 who "succeeds" in finding the perfect guest, 
                 IRS employee Barry (Carell), for his boss' monthly event, 
                 a so-called "dinner for idiots," which offers certain 
                 advantages to the exec who shows up with the biggest buffoon.
                 </description>
            </movie>
        </decade>
        <decade years="1980s">
            <movie favorite="False" title="Ghostbusters">
                <format multiple="No">Online,VHS</format>
                <year>1984</year>
                <rating>PG</rating>
                <description>Who ya gonna call?</description>
            </movie>
        </decade>
        <decade years="1990s">
            <movie favorite="True" title="Robin Hood: Prince of Thieves">
                <format multiple="No">Blu_Ray</format>
                <year>1991</year>
                <rating>Unknown</rating>
                <description>Robin Hood slaying</description>
                <submovie>
                    <year>1992</year>
                    <rating>PG</rating>
                </submovie>
            </movie>
        </decade>
    </genre>
</collection>

标签： pythonxml

Answer 1

下面是一个工作示例。

请注意，您发布的 XML 文档不是有效的 XML。

import xml.etree.ElementTree as ET


xml = '''
<collection>
    <genre category="Action">
        <decade years="1980s">
            <movie favorite="True" title="Indiana Jones: The raiders of the lost Ark">
                <format multiple="No">DVD</format>
                <year>1981</year>
                <rating>PG</rating>
                <description>
                "Archaeologist and adventurer Indiana Jones 
                is hired by the U.S. government to find the Ark of the 
                Covenant before the Nazis."
                </description>
            </movie>
               <movie favorite="True" title="THE KARATE KID">
               <format multiple="Yes">DVD,Online</format>
               <year>1984</year>
               <rating>PG</rating>
               <description>None provided.</description>
            </movie>
            <movie favorite="False" title="Back 2 the Future">
               <format multiple="False">Blu-ray</format>
               <year>1985</year>
               <rating>PG</rating>
               <description>Marty McFly</description>
            </movie>
        </decade>
        <decade years="1990s">
            <movie favorite="False" title="X-Men">
               <format multiple="Yes">dvd, digital</format>
               <year>2000</year>
               <rating>PG-13</rating>
               <description>Two mutants come to a private academy for their kind whose resident superhero team must 
               oppose a terrorist organization with similar powers.</description>
            </movie>
            <movie favorite="True" title="Batman Returns">
               <format multiple="No">VHS</format>
               <year>1992</year>
               <rating>PG13</rating>
               <description>NA.</description>
            </movie>
               <movie favorite="False" title="Reservoir Dogs">
               <format multiple="No">Online</format>
               <year>1992</year>
               <rating>R</rating>
               <description>WhAtEvER I Want!!!?!</description>
               <submovie>
                    <year>1992</year>
                    <rating>R</rating>
                </submovie>
            </movie>
        </decade>    
    </genre>

    <genre category="Thriller">
        <decade years="1970s">
            <movie favorite="False" title="ALIEN">
                <format multiple="Yes">DVD</format>
                <year>1979</year>
                <rating>R</rating>
                <description>"""""""""</description>
            </movie>
        </decade>
        <decade years="1980s">
            <movie favorite="True" title="Ferris Bueller's Day Off">
                <format multiple="No">DVD</format>
                <year>1986</year>
                <rating>PG13</rating>
                <description>Funny movie about a funny guy</description>
            </movie>
            <movie favorite="FALSE" title="American Psycho">
                <format multiple="No">blue-ray</format>
                <year>2000</year>
                <rating>Unrated</rating>
                <description>psychopathic Bateman</description>
            </movie>
        </decade>
    </genre>

    <genre category="Comedy">
        <decade years="1960s">
            <movie favorite="False" title="Batman: The Movie">
                <format multiple="Yes">DVD,VHS</format>
                <year>1966</year>
                <rating>PG</rating>
                <description>What a joke!</description>
            </movie>
        </decade>
        <decade years="2010s">
            <movie favorite="True" title="Easy A">
                <format multiple="No">DVD</format>
                <year>2010</year>
                <rating>PG--13</rating>
                <description>Emma Stone = Hester Prynne</description>
            </movie>
            <movie favorite="True" title="Dinner for SCHMUCKS">
                <format multiple="Yes">DVD,digital,Netflix</format>
                <year>2011</year>
                <rating>Unrated</rating>
                <description>Tim (Rudd) is a rising executive
                 who "succeeds" in finding the perfect guest, 
                 IRS employee Barry (Carell), for his boss' monthly event, 
                 a so-called "dinner for idiots," which offers certain 
                 advantages to the exec who shows up with the biggest buffoon.
                 </description>
            </movie>
        </decade>
        <decade years="1980s">
            <movie favorite="False" title="Ghostbusters">
                <format multiple="No">Online,VHS</format>
                <year>1984</year>
                <rating>PG</rating>
                <description>Who ya gonna call?</description>
            </movie>
        </decade>
        <decade years="1990s">
            <movie favorite="True" title="Robin Hood: Prince of Thieves">
                <format multiple="No">Blu_Ray</format>
                <year>1991</year>
                <rating>Unknown</rating>
                <description>Robin Hood slaying</description>
                <submovie>
                    <year>1992</year>
                    <rating>PG</rating>
                </submovie>
            </movie>
        </decade>
    </genre>
</collection>'''

root = ET.fromstring(xml)
movies = root.findall('.//movie/[year="1992"]')
submovies = root.findall('.//submovie/[year="1992"]')
print('{} movies were found'.format(len(movies)))
print('{} submovies were found'.format(len(submovies)))

all_movies = list(movies)
all_movies.extend(submovies)
rating = [r.find('./rating').text for r in all_movies]
print('Rating:')
print(rating)

输出

2 movies were found
2 submovies were found
Rating:
['PG13', 'R', 'R', 'PG']