如何使用 Python 从 JSON 文件中提取列表中所有对象的特定字段
我正在尝试为列表中的每个对象提取一个特定的字段，它在 JSON 中的值，到目前为止，我已经开始一个一个地获取它们，但是如果有更多的对象具有相同的字段，它需要提取所有这些字段被添加到 JSON 中。
这是 JSON：
[{
"took" : 1023,
"timed_out" : false,
"_shards" : {
"total" : 5,
"successful" : 5,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : 1,
"max_score" : 114.88808,
"hits" : [
{
"_index" : 1,
"_type" : "doc",
"_id" : 1,
"_score" : 114.88808,
"_source" : {
"message" : "Error something happened"
}
}
]
}
},
{
"took" : 1023,
"timed_out" : false,
"_shards" : {
"total" : 5,
"successful" : 5,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : 1,
"max_score" : 114.88808,
"hits" : [
{
"_index" : 2,
"_type" : "doc",
"_id" : 2,
"_score" : 114.88808,
"_source" : {
"message" : "Something else"
}
}
]
}
}
]
我正在尝试从两个对象的字段中获取值message，就我提到的而言，我设法像这样一个一个地完成：
data = json.loads(open('test.json').read())
extracted_data = data[0]['hits']['hits'][0]['_source']['message']
弑天下3回答
-
富国沪深
以下data = [{ "took" : 1023, "timed_out" : 'false', "_shards" : { "total" : 5, "successful" : 5, "skipped" : 0, "failed" : 0 }, "hits" : { "total" : 1, "max_score" : 114.88808, "hits" : [ { "_index" : 1, "_type" : "doc", "_id" : 1, "_score" : 114.88808, "_source" : { "message" : "Error something happened" } } ] } }, { "took" : 1023, "timed_out" : 'false', "_shards" : { "total" : 5, "successful" : 5, "skipped" : 0, "failed" : 0 }, "hits" : { "total" : 1, "max_score" : 114.88808, "hits" : [ { "_index" : 2, "_type" : "doc", "_id" : 2, "_score" : 114.88808, "_source" : { "message" : "Something else" } } ] } }]messages = [x['hits']['hits'][0]['_source']['message'] for x in data]print(messages)输出['Error something happened', 'Something else'] -
繁星coding
尝试这个res = [y['_source']['message'] for x in data for y in x['hits']['hits']]print(res)输出：['Error something happened', 'Something else'] -
呼啦一阵风
一个简单的 for 循环就可以解决问题：for d in data : extracted_data.append(d['hits']['hits'][0]['_source']['message'])
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