# 日志配置
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,  # 是否禁用其他日志
    'formatters': {
        'verbose': {
            'format': '%(levelname)s %(asctime)s %(module)s %(lineno)d %(message)s'
        },
        'simple': {
            'format': '%(levelname)s %(module)s %(lineno)d %(message)s'
        },
    },
    # 日志过滤
    'filters': {
        'require_debug_true': {
            '()': 'django.utils.log.RequireDebugTrue',
        },
    },
    # 日志操作方式
    'handlers': {
        'console': {
            'level': 'DEBUG',
            'filters': ['require_debug_true'],
            'class': 'logging.StreamHandler',
            'formatter': 'simple'
        },
        'file': {
            'level': 'INFO',
            'class': 'logging.handlers.RotatingFileHandler',
            # 日志输出位置，日志文件名，日志保存目录必须手动创建
            'filename': os.path.join(os.path.dirname(BASE_DIR), "logs/MxOnline.log"),
            # 日志文件最大值，300M
            'maxBytes': 300 * 1024 * 1024,
            # 日志文件的数量，设置最大日志数量为10
            'backupCount': 10,
            #日志格式：详细格式
            'formatter': 'verbose'
        },
    },
    # 日志对象
    'loggers': {
        'MxOnline': {
            'handlers': ['console', 'file'],
            'propagate': True, # 是否让日志信息继续冒泡给其他日志处理系统
        },
    }
}

Traceback (most recent call last):
  File "E:/virtual_environment/mypython/MxOnline/manage.py", line 21, in <module>
    main()
  File "E:/virtual_environment/mypython/MxOnline/manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\core\management\__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\core\management\commands\runserver.py", line 60, in execute
    super().execute(*args, **options)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\core\management\base.py", line 364, in execute
    output = self.handle(*args, **options)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\core\management\commands\runserver.py", line 95, in handle
    self.run(**options)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\core\management\commands\runserver.py", line 102, in run
    autoreload.run_with_reloader(self.inner_run, **options)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\utils\autoreload.py", line 579, in run_with_reloader
    start_django(reloader, main_func, *args, **kwargs)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\utils\autoreload.py", line 564, in start_django
    reloader.run(django_main_thread)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\utils\autoreload.py", line 272, in run
    get_resolver().urlconf_module
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\utils\functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\urls\resolvers.py", line 564, in urlconf_module
    return import_module(self.urlconf_name)
  File "E:\virtual_environment\Python3.7.3\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "E:\virtual_environment\mypython\MxOnline\MxOnline\urls.py", line 20, in <module>
    path('admin/', admin.site.urls),
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\utils\functional.py", line 256, in inner
    self._setup()
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\contrib\admin\sites.py", line 529, in _setup
    AdminSiteClass = import_string(apps.get_app_config('admin').default_site)
  File "E:\virtual_environment\Python3.7.3\lib\site-packages\django\apps\registry.py", line 162, in get_app_config
    raise LookupError(message)
LookupError: No installed app with label 'admin'.