Error:
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.

Solution:
Add to the python file that reports the error:

import os,django
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "project_name.settings") # project_name project name
django.setup()