为什么Python的json.dump保存的是unicode?

Question

import json
d={"name":"孙悟空","age":18,"gender":"MALE"}
f=open("d:/test.json","w",encoding='utf-8')
json.dump(d,f)
f.close()

为什么写入的文件中不是汉字，而是unicode？
{"name": "u5b59u609fu7a7a", "age": 18, "gender": "MALE"}

Answer 1

json.dump(d,f,ensure_ascii=False)

If ensure_ascii is true (the default), the output is guaranteed to have all incoming non-ASCII characters escaped. If ensure_ascii is false, these characters will be output as-is.