import json
 
data = {
  "statusCode": 200,
  "data": {
    "totoal": "5",
    "height": "5.97",
    "weight": "10.30",
    "age": "11"
  },
  "msg": "成功"
}
 
#dumps:把字典转换为json字符串
s = json.dumps(data)
print(s)
 
#loads:把json转换为dict
ss = json.loads(s)
print(ss)

#打印msg对应的值print(s["msg"]) #TypeError: string indices must be integers
print(ss["msg"])

#打印data下age对应的值
print(ss["data"]["age"])