2017 Vue+Django API前后端分离开发电商新技课程中出现的问题

Question

INSTALLED_APPS = {    'django.contrib.auth',    'django.contrib.contenttypes',    'django.contrib.sessions',    'django.contrib.messages',    'django.contrib.staticfiles',    'users.apps.UsersConfig',    'DjangoUeditor',    'goods.apps.GoodsConfig',    'trade.apps.TradeConfig',    'user_operation.apps.UserOperationConfig',    'crispy_forms',    'django_filters',    'xadmin',    'rest_framework',}这是报的错误码Traceback (most recent call last):  File "E:/work1/mxshop/mxshop/urls.py", line 24, in <module>    url(r'^xadmin/', xadmin.site.urls),  File "E:\work1\mxshop\extra_apps\xadmin\sites.py", line 339, in urls    return self.get_urls(), self.name, self.app_name  File "E:\work1\mxshop\extra_apps\xadmin\sites.py", line 293, in get_urls    from xadmin.views.base import BaseAdminView  File "E:\work1\mxshop\extra_apps\xadmin\views\__init__.py", line 3, in <module>    from .base import BaseAdminPlugin, BaseAdminView, CommAdminView, ModelAdminView, filter_hook, csrf_protect_m, BaseAdminObject  File "E:\work1\mxshop\extra_apps\xadmin\views\base.py", line 31, in <module>    from xadmin.util import static, json, vendor, sortkeypicker  File "E:\work1\mxshop\extra_apps\xadmin\util.py", line 23, in <module>    if 'django.contrib.staticfiles' in settings.INSTALLED_APPS:  File "D:\Python\Python36-32\lib\site-packages\django\conf\__init__.py", line 56, in __getattr__    self._setup(name)  File "D:\Python\Python36-32\lib\site-packages\django\conf\__init__.py", line 39, in _setup    % (desc, ENVIRONMENT_VARIABLE))django.core.exceptions.ImproperlyConfigured: Requested setting INSTALLED_APPS, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.