pip install flask-restplus

from flask import Flask
from flask_restplus import Api, Resource, fields, reqparse

app = Flask(__name__)
api = Api(app, version='1.0', title='TodoMVC API', description='A simple TodoMVC API',)

ns = api.namespace('todo', description='TODO operations')               # 模块命名空间

todo = api.model('Todo', {                               # 返回值模型
  'id': fields.Integer(readonly=True, description='The task unique identifier'),
  'task': fields.String(required=True, description='The task details')
})

parser = reqparse.RequestParser()                      # 参数模型
parser.add_argument('id', type=str, required=True, help="id")
parser.add_argument('name', type=str, required=True, help="名称")
parser.add_argument('volume', type=int, required=True, help="方量")


class TodoDAO(Resource):
  def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)
    self.params = parser.parse_args()

  @ns.expect(parser)                  # 用于解析对应文档参数，             
  @ns.response(200, "success response", todo)      # 对应解析文档返回值
  def get(self):
    return self.params


ns.add_resource(TodoDAO, "/to", endpoint="to_do")

app.run()