Python question about positioning of "from... import" statement

[Daniel Grace]

Hi, this is more of a Python question but here is something I don't understand in a Django script.

The following script works fine:

import os

import django

if __name__ == '__main__':

    print("Starting Rango delete data script...")

    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'tango.settings')

    django.setup()

    from rango.models import Category, Page

    Page.objects.all().delete()

    Category.objects.all().delete()

    print("Deleted all data from tables: Page and Category.")

...but when I move the "from... import" statement to the top of the file:

import os

import django

from rango.models import Category, Page

if __name__ == '__main__':

    print("Starting Rango delete data script...")

    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'tango.settings')

    django.setup()

    Page.objects.all().delete()

    Category.objects.all().delete()

    print("Deleted all data from tables: Page and Category.")

...I get an error:

  File "C:\landy\lib\site-packages\django\conf\__init__.py", line 40, in _setup

    % (desc, ENVIRONMENT_VARIABLE))

django.core.exceptions.ImproperlyConfigured: Requested setting DEFAULT_INDEX_TAB

LESPACE, but settings are not configured. You must either define the environment

 variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing s

ettings.

What is going on?

Thanks

[Shai Efrati]

Hi!

If i'm not wrong, the reason is that you try to import rango.models before django.setup()

Try moving django.setup() after you import django and then your

from rango.models import Category, Page

Though i'm not sure it will work either, because you call:

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'tango.settings')

after from rango.models import...

Let me know if that helped :)


Shai.

--
You received this message because you are subscribed to the Google Groups "Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to django-users...@googlegroups.com.
To post to this group, send email to django...@googlegroups.com.
Visit this group at http://groups.google.com/group/django-users.
To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/955fb638-1724-4115-951a-668218e68771%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Daniel Grace]

OK, I should have read the warning on the Tango with Django page section 5.8:

"When importing Django models, make sure you have imported your project’s settings by that stage. If you don’t, an exception will be raised. This is why we import Category and Page towards the end of the population script, rather than at the top."