{"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}}是字符串呢

如果你要获取的是字符串，那么可以使用以下代码来获取第一个topic的字符串值：

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}}'

data = json.loads(json_str)

topic_str = data['data'][0]['topic']

print(topic_str)

输出结果为：

'4e4a3668bf514c6f89738c5f3eec6285'

如果你要获取所有topic的字符串值，那么可以使用以下代码：

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}}'

data = json.loads(json_str)

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

print(topics_str)

输出结果为：

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