python - 解压字典列表并为不同的键组合多个值

Answer 1

我建议将defauldict每个作者的书名分组，然后根据需要打印

from collections import defaultdict

values = [{'author__name': 'Alexandre Dumas', 'title': 'The Three Musketeer'},
          {'author__name': 'Alexandre Dumas', 'title': 'The Count of Monte Cristo'},
          {'author__name': 'Leo Tolstoy', 'title': 'Resurrection'},
          {'author__name': 'Leo Tolstoy', 'title': 'War and Peace'},
          {'author__name': 'Leo Tolstoy', 'title': 'Anna Karenina'}]

result = defaultdict(list)
for value in values:
    result[value['author__name']].append(value['title'])

for author, titles in result.items():
    print(author, ":", ",".join(f'"{title}"' for title in titles))

Alexandre Dumas : "The Three Musketeer","The Count of Monte Cristo"
Leo Tolstoy : "Resurrection","War and Peace","Anna Karenina"

Answer 2

您可以简单地使用以下代码：

import pandas as pd
data = [{'author__name': 'Alexandre Dumas', 'title': 'The Three Musketeer'},
        {'author__name': 'Alexandre Dumas', 'title': 'The Count of Monte Cristo'},
        {'author__name': 'Leo Tolstoy', 'title': 'Resurrection'},
        {'author__name': 'Leo Tolstoy', 'title': 'War and Peace'},
        {'author__name': 'Leo Tolstoy', 'title': 'Anna Karenina'}]

pd.DataFrame(data).groupby("author__name")["title"].apply(lambda x: ','.join(x)).reset_index()

输出

	作者姓名	标题
0	大仲马	三个火枪手，基督山伯爵
1	列夫·托尔斯泰	复活，战争与和平，安娜卡列尼娜

解释

使用groupby，您可以对您喜欢的任何列进行分组。然后通过apply在标题列上使用，您可以根据需要加入字符串。