配置应用，路径：aaa/TestModel/apps.py

from django.apps import AppConfig
class TestmodelConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'TestModel'

修改项目url，而不是应用url,路径：aaa/urls.py

from django.urls import path, include
from . import views
urlpatterns = [
    path('', views.hello),
    path('staff/', include('TestModel.urls')),
]

修改项目设置，路径：aaa/settings.py

"""
Django settings for aaa project.

Generated by 'django-admin startproject' using Django 3.2.12.

For more information on this file, see
https://docs.djangoproject.com/en/3.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/3.2/ref/settings/
"""
import os
from pathlib import Path

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'django-insecure-^1ld4@-ti^qgd#p^rcdv1dj628bk@x%ima3e8a!n&kavpq!+06'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',    # admin管理后台站点
    'django.contrib.auth',     # 身份认证系统
    'django.contrib.contenttypes',   # 内容类型框架
    'django.contrib.sessions',   # 会话框架
    'django.contrib.messages',   # 消息框架
    'django.contrib.staticfiles',    # 静态文件管理框架
    'TestModel',  # 添加此项
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'aaa.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],       # 修改位置
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'aaa.wsgi.application'


# Database
# https://docs.djangoproject.com/en/3.2/ref/settings/#databases

# DATABASES = {
#     'default': {
#         'ENGINE': 'django.db.backends.sqlite3',
#         'NAME': BASE_DIR / 'db.sqlite3',
#     }
# }
DATABASES = {
    'default':
    {
        'ENGINE': 'django.db.backends.mysql',    # 数据库引擎
        'NAME': 'runoob', # 数据库名称
        'HOST': '127.0.0.1', # 数据库地址，本机 ip 地址 127.0.0.1
        'PORT': 3306, # 端口
        'USER': 'root',  # 数据库用户名
        'PASSWORD': 'Dcx0417*', # 数据库密码
    }
}

# Password validation
# https://docs.djangoproject.com/en/3.2/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/3.2/topics/i18n/

LANGUAGE_CODE = 'en-us'

# TIME_ZONE = 'UTC'
TIME_ZONE = 'Asia/Shanghai'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.2/howto/static-files/

STATIC_URL = '/static/'

# Default primary key field type
# https://docs.djangoproject.com/en/3.2/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

########################################################################################################

STATIC_URL = '/static/' # 别名
STATICFILES_DIRS = [
    os.path.join(BASE_DIR, "statics"),
]