从二维列表创建字典 [英] Create dictionary from 2-D list

问题描述

我需要创建一个字典，以作者的姓氏和名字为关键字，以手头的数量、价格和书名作为值.

I need to create a dictionary, with the last and first name of the author as the key, and the quantity on hand, price, and the book's name as the values.

[['Shakespeare', 'William', 'Rome And Juliet', '5', '5.99'], ['Shakespeare', 'William', 'Macbeth', '3', '7.99'], ['Dickens', 'Charles', 'Hard Times', '7', '27.00'], ['']]

到目前为止，我已经编译了这个二维列表，但我被卡住了.

I've compiled this 2-D list, so far and I'm stuck.

任何帮助将不胜感激！

推荐答案

下面将创建一个字典，将每个作者的名字映射到他们所写书籍的list.这是使用名为的内置字典类型的特化完成的defaultdict在collections模块中定义.

The following will create a dictionary that maps each author's name to alistof books they've written. This is done using a specialization of the built-in dictionary type nameddefaultdictwhich is defined in thecollectionsmodule.

from collections import defaultdict
from pprint import pprint

books = [['Shakespeare', 'William', 'Rome And Juliet', '5', '5.99'],
         ['Shakespeare', 'William', 'Macbeth', '3', '7.99'],
         ['Dickens', 'Charles', 'Hard Times', '7', '27.00'],
         ['']]

d = defaultdict(list)
for book in (book for book in books if book[0]):
    d[book[0], book[1]].append(book[2:])

pprint(d)

输出:

{('Dickens', 'Charles'): [['Hard Times', '7', '27.00']],
 ('Shakespeare', 'William'): [['Rome And Juliet', '5', '5.99'],
                              ['Macbeth', '3', '7.99']]}

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