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从命令行执行django数据库操作

从命令行执行django数据库操作,报错:

django.core.exceptions.ImproperlyConfigured: Requested setting DEFAULT_INDEX_TABLESPACE, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

django.core.exceptions.ImproperlyConfigured: settings.DATABASES is improperly configured. Please supply the ENGINE value. Check settings documentation for more details.

看settings.py没有问题

解决办法:
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mysite.settings")

注意这个是不行的:
from django.conf import settings
settings.configure()

两者都写也是不行的