>>> import json
>>> obj = dict(name='小明', age=20)
>>> s = json.dumps(obj, ensure_ascii=True)
>>> print(s)
{"name": "\u5c0f\u660e", "age": 20}
>>> s = json.dumps(obj)
>>> print(s)
{"name": "\u5c0f\u660e", "age": 20}
>>> s = json.dumps(obj, ensure_ascii=False)
>>> print(s)
{"name": "小明", "age": 20}