environment variable DJANGO_SETTINGS_MODULE is undefined.

I have problem importing from  django_tables import tables

and when i do it on manage.py shell i get this error.

>>> import django_tables2

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "build\bdist.win32\egg\django_tables2\__init__.py", line 3, in <module>

  File "build\bdist.win32\egg\django_tables2\tables.py", line 4, in <module>

  File "c:\Python27\lib\site-packages\django\db\__init__.py", line 11, in <module>

    if DEFAULT_DB_ALIAS not in settings.DATABASES:

  File "c:\Python27\lib\site-packages\django\utils\functional.py", line 184, in inner

    self._setup()

  File "c:\Python27\lib\site-packages\django\conf\__init__.py", line 40, 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.

>>>

how do i fix it.

what am i missing here....

thank you so much.

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