python - 使用 Python 从 JSON 中删除条目

Question

我有一个 Python 应用程序，用户可以在其中插入名称和一个或多个扩展名，最终结果如下所示:

{
"sets": [
{
  "name": "first",
  "extensions": ".exe"
},
{
  "name": "second",
  "extensions": [
    ".pdf",
    ".epub"
  ]
},
{
  "name": "third",
  "extensions": [
    ".mp3",
    ".mp4",
    ".wav"
  ]
}
]
}

我想删除名为“third”的条目，以及相应的“extensions”。

我尝试过这样的事情:

def deleteJson():
    lines = []
    with open("sets.json","r") as json_file:
        for line in json_file.readlines():
            j = json.loads(line)
            if not j['name'] == "third":
               lines.append(line)
    with open("sets.json",'w') as json_file:
        json_file.writelines(join(lines))

Answer 1

改用json库:

import json

with open('sets.json') as f:
    data = json.load(f)

data['sets'] = [sub for sub in data['sets'] if sub['name'] != 'third']

with open('sets.json', 'w') as f:
    json.dump(data, f)