Meaning for this error

Hi all,

I wan to import a method in a model class to another
class as well as that method contains some objects includes self

How to import that method's operation?

it shows the error

>>> from users.models import userprofile
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.6/dist-packages/django/contrib/auth/
models.py", line 6, in <module>
from django.db import models
File "/usr/local/lib/python2.6/dist-packages/django/db/__init__.py",
line 14, in <module>
if not settings.DATABASES:
File "/usr/local/lib/python2.6/dist-packages/django/utils/
functional.py", line 276, in __getattr__
self._setup()
File "/usr/local/lib/python2.6/dist-packages/django/conf/
__init__.py", line 38, in _setup
raise ImportError("Settings cannot be imported, because
environment variable %s is undefined." % ENVIRONMENT_VARIABLE)
ImportError: Settings cannot be imported, because environment variable
DJANGO_SETTINGS_MODULE is undefined.
>>>

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