python中使用tornado 中post get 请求报错500

Question

我用tornado写了两个接口，第一个没有问题，然后我吧第一个复制到第二个文件里就报错了
第一个接口代码如下：

 import tornado
from wtforms_tornado import Form
import sys
from app.view.view_xxm.mysqlfuntion import selectnav

class hello(tornado.web.RequestHandler):
    def get(self):
        self.render("hello.html")
class ajaxtest(tornado.web.RequestHandler):
    def set_default_headers(self):
        print("setting headers!!!")
        self.set_header("Access-Control-Allow-Origin", "*")
        self.set_header("Access-Control-Allow-Headers", "x-requested-with")
        self.set_header('Access-Control-Allow-Methods', 'POST, GET, OPTIONS')
    def get(self):
        import json
        type1 = self.get_argument("type")
        print(type1)
        data = [{'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}]
        data1 = selectnav(type1)
        res=dict()
        res=[
            dict(
                id=k.id,
                imgurl=k.imgurl,
                link=k.link,
                title=k.title,
                type=k.type,
                addtime=k.addtime
            )for k in data1
        ]
        print(res)
        json = json.dumps(res).encode("utf-8").decode('unicode_escape')
        self.write(json)

        # data="你好我是刘德华天涯何处无芳草"
        #         # data.encode("utf-8")
        #         # print("get")
        #         # self.write(data)

第二个接口代码如下

import tornado
from wtforms_tornado import Form
import sys
from app.view.view_xxm.mysqlfuntion import selectnav

class hello(tornado.web.RequestHandler):
    def get(self):
        self.render("hello.html")
class selectnav(tornado.web.RequestHandler):
    def set_default_headers(self):
        print("setting headers!!!")
        self.set_header("Access-Control-Allow-Origin", "*")
        self.set_header("Access-Control-Allow-Headers", "x-requested-with")
        self.set_header('Access-Control-Allow-Methods', 'POST, GET, OPTIONS')
    def post(self):
        import json
        type1 = self.get_argument("type")
        print(type1)
        data = [{'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5}]
        data1 = selectnav(type1)
        res=dict()
        res=[
            dict(
                id=k.id,
                imgurl=k.imgurl,
                link=k.link,
                title=k.title,
                type=k.type,
                addtime=k.addtime
            )for k in data1
        ]
        print(res)
        json = json.dumps(res).encode("utf-8").decode('unicode_escape')
        self.write(json)

        # data="你好我是刘德华天涯何处无芳草"
        #         # data.encode("utf-8")
        #         # print("get")
        #         # self.write(data) 

报错信息如下：

完整代码下载地址
下载地址

接口路由是ajax和xxm这两个

Answer 1

from app.view.view_xxm.mysqlfuntion import selectnav
说明有一类或方法叫selectnav

class selectnav(tornado.web.RequestHandler):
同时你又定义了一个重名的类，把import的覆盖了

所以要么你改名，或者至少用别名。

class SelectHandler(tornado.web.RequestHandler):