Question

我正在尝试在此代码中选择特定的密钥，即163,203＆amp; 13.基本上，每次，我的函数运行，我将在变量中存储这3个代码中的一个，我无法弄清楚如何解析Json文件中的特定元素。我想制作一个循环，例如在键'203'停止并返回结果。

function* ChatRoomPageEnter() {
  const chanChat = yield call($stomp.eventChannel, 'ChatRoomPage', '/topic/chat');
  const chanEcho = yield call($stomp.eventChannel, 'ChatRoomPage', '/user/queue/echo');

  while (true) { // eslint-disable-line no-constant-condition
    console.log('A');
    const messageChat = yield take(chanChat);
    console.log('B');
    yield put({ type: 'chatroom/newMessage', payload: messageChat });
    console.log('C'); // <----
    const messageEcho = yield take(chanEcho);
    console.log('D');
    yield put({ type: 'chatroom/newMessage', payload: messageEcho });
    console.log('E');
  }
}

这是JSON。 JSON分为3个部分，每个部分以随机密钥开头，我不知道，如果你看JSON，在有效载荷之后，有价格，然后是id（例如'203'）。我需要获得此id的值。

with open('data.json') as data_file:
    data = json.load(data_file, object_pairs_hook=OrderedDict)
    for key, value in data.items():
        id = '203'
        id_value = value['payload']['price']
        pack = id_value[id]
        print(pack) #pack should be returning the value of the key '203'

Answer 1

在访问它之前检查它存在的ID是错误的。

import json
from collections import OrderedDict

id = '203'

with open('data,json') as data_file:
    data = json.load(data_file, object_pairs_hook=OrderedDict)
    for key, value in data.items():
        id_value = value['payload']['price']
        if id in id_value: # check first if id is present
            pack = id_value[id]
            print(pack) #pack should be returning the value of the key '203'

Answer 2

with open('data.json') as data_file:
    data = json.load(data_file, object_pairs_hook=OrderedDict)
    for key, value in data.items():
        id = '203'
        if value['payload']['price'] == id:
            print(value['payload']['price'])

这是我可以从你的问题中得出的结果。如果那不符合预期，请在下面评论。

Answer 3

我尝试展平JSON对象，以便所有键都处于同一级别。

import json
from pandas.io.json import json_normalize
from collections import OrderedDict

with open('data.json') as data_file:
data = json.load(data_file, object_pairs_hook=OrderedDict)
data=json_normalize(data)
id='163'
for key, value in data.items():
    nested_ids = key.split('.')
    if (id in nested_ids):
        print(value)

这会让你朝着正确的方向前进吗？

解析JSON并在python中选择一个特定的键

3 个答案: