{"data":[{"node":"emqx@127.0.0.1","topic":"4e4a3668bf514c6f89738c5f3eec6285"},{"node":"emqx@127.0.0.1","topic":"05f170438ab44d769f9f67c1406316c2"},{"node":"emqx@127.0.0.1","topic":"fcef086b0ea443429cc867a35fb630fd"},{"node":"emqx@127.0.0.1","topic":"topic_aaa"}],"meta":{"count":4,"hasnext":false,"limit":20,"page":1}}为字符串，取出topic的值

可以使用 JSON 解析库将该字符串解析为 JSON 对象，然后遍历其中的数据，取出每个对象中的 "topic" 字段的值即可。以下是 Python 代码示例：

import json

json_str = '{"data":[{"node":"emqx@127.0.0.1","topic":"4e4a3668bf514c6f89738c5f3eec6285"},{"node":"emqx@127.0.0.1","topic":"05f170438ab44d769f9f67c1406316c2"},{"node":"emqx@127.0.0.1","topic":"fcef086b0ea443429cc867a35fb630fd"},{"node":"emqx@127.0.0.1","topic":"topic_aaa"}],"meta":{"count":4,"hasnext":false,"limit":20,"page":1}}'

json_obj = json.loads(json_str)
for item in json_obj['data']:
    print(item['topic'])

输出结果为：

4e4a3668bf514c6f89738c5f3eec6285
05f170438ab44d769f9f67c1406316c2
fcef086b0ea443429cc867a35fb630fd
topic_aaa

相关问题

{"data":[{"node":"emqx@127.0.0.1","topic":"4e4a3668bf514c6f89738c5f3eec6285"},{"node":"emqx@127.0.0.1","topic":"05f170438ab44d769f9f67c1406316c2"},{"node":"emqx@127.0.0.1","topic":"fcef086b0ea443429cc867a35fb630fd"},{"node":"emqx@127.0.0.1","topic":"topic_aaa"}],"meta":{"count":4,"hasnext":false,"limit":20,"page":1}}取出里面topic的值

可以使用以下代码来解析JSON数据并获取topic的值：

import json

json_data = '{"data":[{"node":"emqx@127.0.0.1","topic":"4e4a3668bf514c6f89738c5f3eec6285"},{"node":"emqx@127.0.0.1","topic":"05f170438ab44d769f9f67c1406316c2"},{"node":"emqx@127.0.0.1","topic":"fcef086b0ea443429cc867a35fb630fd"},{"node":"emqx@127.0.0.1","topic":"topic_aaa"}],"meta":{"count":4,"hasnext":false,"limit":20,"page":1}}'

data = json.loads(json_data)

topics = [d['topic'] for d in data['data']]

print(topics)

输出结果为：

['4e4a3668bf514c6f89738c5f3eec6285', '05f170438ab44d769f9f67c1406316c2', 'fcef086b0ea443429cc867a35fb630fd', 'topic_aaa']