如何将具有相同键的字典合并？

Question

我想将以下代码与Keys Action和Thriller合并。仅会显示2个键{'Action'：[电影列表]，'Thriller'：[电影列表]}。也欢迎使用新代码，例如lxml或BeautifulSoup。

我的代码如下：

import xml.etree.ElementTree as ET
from collections import defaultdict
tree = ET.parse('movies.xml')
root = tree.getroot()
d = {}
for child in root:
    #print( child.attrib.values())
    for movie in root.findall("./genre/decade/movie[@title]"):
    #print(movie.attrib)
        #print (list(movie.attrib.values())[1])
        d[child.attrib.values()]=list(movie.attrib.values())[1]
d

我的输出

 {dict_values(['Action']): 'Indiana Jones: The raiders of the lost Ark',
 dict_values(['Action']): 'THE KARATE KID',
 dict_values(['Action']): 'Back 2 the Future',
 dict_values(['Action']): 'X-Men',
 dict_values(['Action']): 'Batman Returns',
 dict_values(['Action']): 'Reservoir Dogs',
 dict_values(['Action']): 'ALIEN',
 dict_values(['Action']): "Ferris Bueller's Day Off",
 dict_values(['Action']): 'American Psycho',
 dict_values(['Thriller']): 'Indiana Jones: The raiders of the lost Ark',
 dict_values(['Thriller']): 'THE KARATE KID',
 dict_values(['Thriller']): 'Back 2 the Future',
 dict_values(['Thriller']): 'X-Men',
 dict_values(['Thriller']): 'Batman Returns',
 dict_values(['Thriller']): 'Reservoir Dogs',
 dict_values(['Thriller']): 'ALIEN',
 dict_values(['Thriller']): "Ferris Bueller's Day Off",
 dict_values(['Thriller']): 'American Psycho'}

我的xml来自datacamp。数据营地提供有关报废的信息 下面是xml，我已保存在本地文件夹中并命名为电影

<?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>
            </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>
</collection>

Answer 1

您的代码可以很好地获取数据，这就是您解析数据的方式。在字典中，.values()返回值的视图，您可以根据需要将其存储到列表中。在这种情况下，您需要字典本身的值，只需按键选择即可。 child.attrib['category']。一旦知道了，您要做的就是更新字典。在这里，我们将使用defaultdict，当第一次遇到该键时，它会返回一个空列表，以便我们可以添加电影标题。

import xml.etree.ElementTree as ET
from collections import defaultdict

tree = ET.parse('movies.xml')
root = tree.getroot()
d = defaultdict(list)

for child in root:
    for movie in root.findall("./genre/decade/movie[@title]"):
        d[child.attrib['category']].append(movie.attrib['title'])

>>d

defaultdict(list,
            {'Action': ['Indiana Jones: The raiders of the lost Ark',
              'THE KARATE KID',
              'Back 2 the Future',
              'X-Men',
              'Batman Returns',
              'Reservoir Dogs',
              'ALIEN',
              "Ferris Bueller's Day Off",
              'American Psycho'],
             'Thriller': ['Indiana Jones: The raiders of the lost Ark',
              'THE KARATE KID',
              'Back 2 the Future',
              'X-Men',
              'Batman Returns',
              'Reservoir Dogs',
              'ALIEN',
              "Ferris Bueller's Day Off",
              'American Psycho']})

如果您只想选择说“动作”，则可以像普通字典键一样选择。

d['Action']