如何访问Python嵌套列表的单个值？最优遍历取值及报错解决方法是什么？

错误原因 #

你写的嵌套循环逻辑有误：
你定义的List外层是仅包含1个字典元素的列表，第一层循环for anime in list取出的anime就是这个字典对象。第二层循环for show in anime默认遍历字典的键，得到的show是'name'、'poster'、'summary'这类字符串，你用字符串去做show["name"]的索引操作，自然会抛出TypeError: string indices must be integers的报错。

打印所有name值的实现代码 #

# 先取出列表中的唯一字典元素，再获取key为name对应的列表
name_list = List[0]['name']
# 遍历打印每个name值
for name in name_list:
    print(name)

注：你给出的原始数据中poster字段的"flyer 6"后缺失逗号，运行前需要先补全避免语法报错。

传递数据到HTML页面展示 #

以常用的Flask框架为例，实现逻辑如下：

后端代码 #

from flask import Flask, render_template

app = Flask(__name__)

# 你的动画数据
AnimeList = [{
    'name': ['NARUTO×UT', 'Naruto, the Genie, and the Three Wishes, Believe It!', 'Naruto SD: Rock Lee no Seishun Full-Power Ninden Mō Iccho', 'Naruto Shippūden: The Burning Chūnin Exam! Naruto vs. Konohamaru!!', 'Naruto: The Cross Roads', 'Naruto Spin-Off: Rock Lee & His Ninja Pals', 'Naruto Shippūden: Shippū! "Konoha Gakuen" Den', 'Naruto Shippūden: Blood Prison', 'Naruto Shippūden: The Lost Tower', 'Naruto Shippūden: The Will of Fire', 'Naruto Shippūden the Movie: Bonds', 'Naruto Shippūden', 'Naruto: Konoha Sports Festival', 'Naruto Shippūden', 'Naruto the Movie: Guardians of the Crescent Moon Kingdom', 'Naruto', 'Naruto the Movie: Legend of the Stone of Gelel', 'Naruto Special: Battle at Hidden Falls. I Am the Hero!', 'Naruto: Akaki Yotsuba no Clover o Sagase', 'Naruto the Movie: Ninja Clash in the Land of Snow', 'Naruto'],     
    'poster': ["flyer 1","flyer 2", "flyer 3", "flyer 4", "flyer 5","flyer 6", "flyer 7", "flyer 8", "flyer 9", "flyer 10", "flyer 11", "flyer 12", "flyer 13", "flyer 14"],     
    'summary': ["plot 1", "plot 2", "plot 3", "plot 4", "plot 5", "plot 6", "plot 7", "plot 8","plot 9", "plot 10", "plot 11", "plot 12","plot 13", "plot 14", ]
}]

@app.route('/anime')
def show_anime():
    # 提取数据传递到HTML模板
    anime_data = AnimeList[0]
    return render_template('anime.html', anime_data=anime_data)

if __name__ == '__main__':
    app.run(debug=True)

HTML模板代码（路径为templates/anime.html） #

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>动画列表</title>
    <style>
        .anime-item {margin: 20px 0; padding-bottom: 15px; border-bottom: 1px solid #eee;}
        img {max-width: 200px;}
    </style>
</head>
<body>
    <h1>火影相关动画作品</h1>
    <div class="anime-container">
        {% for name, poster, summary in zip(anime_data['name'], anime_data['poster'], anime_data['summary']) %}
        <div class="anime-item">
            <h3>{{ name }}</h3>
            <img src="{{ poster }}" alt="{{ name }}海报">
            <p><strong>剧情简介：</strong>{{ summary }}</p>
        </div>
        {% endfor %}
    </div>
</body>
</html>

如果使用Django框架，只需要在后端将三个字段按索引打包成嵌套列表再传递到模板，直接遍历嵌套列表即可，模板语法和上述逻辑一致。

内容的提问来源于stack exchange，提问作者Drey's