python语法给文件中每条json追加字段追加数据

Question

文件中有多条json，想用python语法给文件中每条json追加一些字段添加数据。如何做呢？

Answer 1

先读再写，比如这样

import json
new = {"new":"test"}
with open("test.json") as f:
    a = json.load(f)
a.update(new)
with open("test.json", "w") as f:
    json.dump(a, f)