json loads keep order

最近在看豆瓣API快速入门, 输入如下api到浏览器的地址栏，Enter后

https://api.douban.com/v2/book/1220562

{“rating”:{“max”:10,”numRaters”:368,”average”:”7.3”,”min”:0} …

返回值为json, 单行压缩的文本不便于阅读，需要tabify一下。

Tabify

python内置了标准库json, json库的dumps函数可以实现tabify功能。过程如下:
从Server上Requert数据，用json.dumps Tabify后, 存盘。

# -*- coding:utf-8 -*-
import json
import urllib.request

def GetDoubanBook2Json(url):
    with urllib.request.urlopen(url) as f:
        cc = json.loads(f.read().decode('utf-8'), encoding='utf-8')

        save_file_name = url[url.rfind('/')+1:] + '.json'
        with open(save_file_name, 'w', encoding='utf-8') as f:
            f.write(json.dumps(cc, indent=4, ensure_ascii=False))

if __name__ == '__main__':
    url = 'https://api.douban.com/v2/book/1220562'
    GetDoubanBook2Json(url)

Keep Order

和之前的单行压缩文本对比，发现json的key的顺序发生了变化。Google了一下，python-json-loads-changes-the-order-of-the-object给了Solution:

from collections import OrderedDict
data_content = json.loads(input_data.decode('utf-8'), object_pairs_hook=OrderedDict)

# -*- coding:utf-8 -*-
import json
from collections import OrderedDict
import urllib.request

def GetDoubanBook2Json(url):
    with urllib.request.urlopen(url) as f:
        # object_pairs_hook = OrderedDict, keep order
        cc = json.loads(f.read().decode('utf-8'), object_pairs_hook = OrderedDict, encoding='utf-8')
        
        save_file_name = url[url.rfind('/')+1:] + '.json'
        with open(save_file_name, 'w', encoding='utf-8') as f:
            f.write(json.dumps(cc, indent=4, ensure_ascii=False))

if __name__ == '__main__':
    url = 'https://api.douban.com/v2/book/1220562'
    GetDoubanBook2Json(url)

结果对比如图:

Reference

• 豆瓣API快速入门
• json-python documentation
• urllib python3.x
• python-json-loads-changes-the-order-of-the-object