python - 使用多个 'for' 循环解码嵌套的 JSON

Question

我是 Python 的新手(上周)，已经达到了我的极限。在这上面花了三天时间，我大部分时间都在 stackoverflow 上，但我不知道如何继续下去!

Json有多个嵌套数组。它可以包含三个(如下面的示例 (json.txt) 所示)或 30 个。我需要遍历每个，然后深入到“innings”并最终获得“wickets”的值。这是我感到困惑的最后一步。任何人都可以建议吗？

你的绝望

将

import os, json,requests
print 'Starting'
url = 'https://dl.dropboxusercontent.com/u/3758695/json.txt'

# download the json string
json_string = requests.get(url)
print 'Downloaded json'

# get the content
the_data = json_string.json()
print 'the_data has length ', len(the_data)
for index in range(len(the_data)):
    print 'Now working on index ', index
    for wicket in the_data[index]:
            print 'wicket equals ',wicket
                    # OK - I can see Innings. Now, how do I get inside
                    # and obtain 'wickets'?

Answer 1

首先，不要使用索引而是直接遍历列表；这样你就可以给他们起有意义的名字。顶层是一个条目列表，每个条目都是一个带有 'innings' 键的字典，每个 innings 都是一个字典列表，其中包括: wickets 键:

for entry in data:
    for inning in entry['innings']:
        print inning['wickets']

这打印:

>>> for entry in data:
...     for inning in entry['innings']:
...         print inning['wickets']
... 
10
9
0
0

这也使得在每个级别添加信息变得更加容易:

>>> for entry in data:
...     print entry['description']
...     for i, inning in enumerate(entry['innings']):
...         print 'Innings {}: {} wickets'.format(i + 1, inning['wickets'])
... 
Rest of Sri Lanka v Sri Lanka A at Pallekele, May 14, 2013
Innings 1: 10 wickets
Innings 2: 9 wickets
63rd match: Royal Challengers Bangalore v Kings XI Punjab at Bangalore, May 14, 2013
Innings 1: 0 wickets
Innings 2: 0 wickets
64th match: Chennai Super Kings v Delhi Daredevils at Chennai, May 14, 2013