Python检查带有变量的json文件 [英] Python check json file with variables

问题描述

我有一个json文件，其中包含18个子字符串，如下所示: https://i.stack.imgur.com/aVWuw.png https://i.imgur.com/0ABdcde.png

I have a json file which has 18 substrings like this: https://i.stack.imgur.com/aVWuw.png https://i.imgur.com/0ABdcde.png

但是我有更多的json文件，这些文件具有不同数量的这些子字符串.因此，我这样做是为了查找文本中有多少:

But I have more json files who have different number of these substrings. So I did this to find how many there are in the text:

import json

json_str = open('jsonfile.txt', 'r').read()

contact = json.loads(json_str)

所以GraphImages_total是18 . 每个子字符串都有注释->数据-> 0->所有者->用户名 所以我想打印用户名.

So GraphImages_total is 18 . Every substring has comments --> data --> 0 --> owner --> username So I want to print the username.

comment_author = contact["GraphImages"][0]["comments"]["data"][0]["owner"]["username"]
print(comment_author)

这是针对GraphImages_total = 0 但是我想为所有人做.

This is for GraphImages_total = 0 But I want to do it for all of them.

所以我需要一种使其像这样的方式:

So I need a way to make it like this:

for graph_image in contact['GraphImages']:
    comment_author = contact["GraphImages"][graph_image]["comments"]["data"][0]["owner"]["username"]
    print(comment_author)

但是我得到这个错误:

comment_author = contact["GraphImages"][graph_image]["comments"]["data"][0]["owner"]["username"]IndexError: list index out of range

推荐答案

contact["GraphImages"][0]["comments"]["data"][0]["owner"]["username"]
                       ^                      ^

这表明未知长度的列表在哪里. GraphImages和data键保存列表.要遍历列表，请使用for .. in语句，如下所示:

This indicates where the lists of unknown length are. The GraphImages and data keys hold lists. To iterate over a list, you use a for .. in statement as follows:

my_list = ['foo', 'bar', 'baz']
for item in my_list:
    print(item)

请注意，您正在直接使用item.在循环的每个相应迭代中，item将依次变为'foo'，'bar'和'baz'.您无需使用任何数字索引，也无需计算任何x或y.

Note that you're using item directly. item will in turn become 'foo', 'bar' and 'baz' on each respective iteration of the loop. You don't need to use any numeric indices nor count up any x or y.

根据您的情况，您需要两个这样的循环:

Applied to your situation, you need two such loops:

for graph_image in contact['GraphImages']:
    for comment in graph_image['comments']['data']:
        print(comment['text'], comment['owner']['username'])

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