烧瓶资源导入错误

我在YouTube上做了以下教程: https://www.youtube.com/watch?v=s_ht4AKnWZg

这是我的代码:

from flask import Flask, request
from flask_restful import Resource, Api

app = Flask(__name__)
api = Api(app)

class HelloWorld(Resource):
    def get(self):
        return {'about':'Hello World!'}

    def post(self):
        some_json = request.get_json()
        return {'you sent': some_json}, 201

class Multi(Resource):
    def get(self, num):
        return {'result': num*10}

api.add_resource(HelloWorld, '/')
api.add_resource(Multi, '/multi/<int:num>')

if __name__ == '__main__':
    app.run(debug=True)

现在,当我运行脚本时,我得到以下错误:

/home/one/systemx/test_api$ python flask_restful.py
Traceback (most recent call last):
  File "flask_restful.py", line 2, in <module>
    from flask_restful import Resource, Api
  File "/home/one/systemx/test_api/flask_restful.py", line 2, in <module>
    from flask_restful import Resource, Api
ImportError: cannot import name Resource

代码是1:1,就像视频中那样。有人知道问题出在哪里吗?