TypeError:“str”对象不支持项分配，python带有json文件

Question

下面是我的代码

import json
with open('johns.json', 'r') as q:
    l = q.read()
    data = json.loads(l)
    data['john'] = '{}'
    data['john']['user'] = 'hey'

下面是json文件

{}

每次运行代码时，我都会得到错误

    data['john']['user'] = 'hey'
TypeError: 'str' object does not support item assignment

有没有办法解决这个问题并使数据['john']['user']相等

Answer 1

它必须读出来

data['john'] = dict()
# or data['john'] = {}

否则，data["john"]是一个字符串，即{}