#ensure_ascii 默认值True
import json

obj = dict(name='小明', age=20)
s = json.dumps(obj, ensure_ascii=False)
print(s) # {"name": "小明", "age": 20}

h = json.dumps(obj, ensure_ascii=True)
print(h) # {"name": "\u5c0f\u660e", "age": 20}