Python 在Django REST框架中定义的URL获得404分

我正在try 访问Django app(abcd)中定义的URL.

应用程序:

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    'rest_framework',
    "abcd",
]

urls.py个

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path("admin/", admin.site.urls), path('', include('abcd.urls'))
]

abcd.urls个

from rest_framework import routers

from abcd import views

router = routers.DefaultRouter()
router.register(r'users', views.UserViewSet, 'users')
router.register(r'groups', views.GroupViewSet, 'groups')
urlpatterns = router.urls

views.py个

from rest_framework.viewsets import ViewSet


class UserViewSet(ViewSet):
    pass


class GroupViewSet(ViewSet):
    pass

每当我try 访问:http://localhost:8000/users或http://localhost:8000/groups，时，我都会得到一个404.

Edit

出于某种模糊的原因，每当我执行以下操作时，URL都会被解析:

class UserViewSet(ViewSet):
    def list(self, request):
        pass

class GroupViewSet(ViewSet):
    def list(self, request):
        pass