[英]Python json/dictionary questions
我最近开始使用python进行json读写,并且不得不从提供的json文件中将一些书籍实施到图书馆系统中,看起来像这样;
[
{
"author": "Chinua Achebe",
"country": "Nigeria",
"imageLink": "images/things-fall-apart.jpg",
"language": "English",
"link": "https://en.wikipedia.org/wiki/Things_Fall_Apart\n",
"pages": 209,
"title": "Things Fall Apart",
"year": 1958
},
我编写了这小段代码,将我的书放入python字典中,然后将其实现到更大的系统中。
import json
with open('C:/Users/daann/Downloads/booksset1.json') as json_file:
booklist = json.load(json_file)
print(booklist)
我的问题是关于字典,以及如何从字典中的json读取数据,现在我的数据在一个长字典中,但是如何读取(例如,仅作者)? 还是只有名字? 我完全忘记了,在任何地方都找不到。
另一个问题,如果我想拿出来,例如我在这里放的第一本书,作者叫“ Chinua Achebe”,有没有办法做到这一点(拿出与该书有关的所有数据,具有给定的作者姓名)?
在每个条目booklist
是一个Python字典,简称dict
。 访问字典中的字段使用方式book[field_name]
。 在您的情况下, field_name
的值为"author"
。
for book in booklist:
print(book["author"]) # or any field you want
以下是一些遍历数据的方法:
booklist = [
{
"author": "Chinua Achebe",
"country": "Nigeria",
"imageLink": "images/things-fall-apart.jpg",
"language": "English",
"link": "https://en.wikipedia.org/wiki/Things_Fall_Apart\n",
"pages": 209,
"title": "Things Fall Apart",
"year": 1958
},
{
"author": "Joe Jackson",
"country": "USA",
"imageLink": "images/white_socks.jpg",
"language": "English",
"link": "https://en.wikipedia.org/wiki/white_sox",
"pages": 500,
"title": "My Shoes Hurt My Feet",
"year": 1919
},
{
"author": "Jane Mae",
"country": "Canada",
"imageLink": "images/ehhhh.jpg",
"language": "French",
"link": "https://en.wikipedia.org/wiki/ehhhh\n",
"pages": 123,
"title": "What's That Aboot",
"year": 2000
}]
# Get all authors in a list (might want to convert to set to remove duplicates)
authors = [d["author"] for d in booklist]
print (authors)
# Find all books by author 'Chinua Achebe'
for book in booklist:
if book['author'] == 'Chinua Achebe':
print (book)
# Find all books later than year 1950
for book in booklist:
if book['year'] > 1950:
print (book['title'], book['year'])
如果要按作者获取书籍,则需要构建另一个查找作者->书籍:
import collections
books_by_author = collections.defaultdict(list)
for b in booklist:
books_by_author[d['author']].append(b)
# and then
books_by_Chinua_Achebe = books_by_author['Chinua Achebe']
此链接对于以字典开头可能会有所帮助: https : //realpython.com/python-dicts/
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