Django 1.7 throws django.core.exceptions.AppRegistryNotReady: Models aren't loaded yet

在程序中要添加django.setup()

整个程序如下所示

import os
import django

def populate():
    python_cat = add_cat('Python')

    add_page(cat=python_cat,
        title="Official Python Tutorial",
        url="http://docs.python.org/2/tutorial/")

    add_page(cat=python_cat,
        title="How to Think like a Computer Scientist",
        url="http://www.greenteapress.com/thinkpython/")

    add_page(cat=python_cat,
        title="Learn Python in 10 Minutes",
        url="http://www.korokithakis.net/tutorials/python/")

    django_cat = add_cat("Django")

    add_page(cat=django_cat,
        title="Official Django Tutorial",
        url="https://docs.djangoproject.com/en/1.5/intro/tutorial01/")

    add_page(cat=django_cat,
        title="Django Rocks",
        url="http://www.djangorocks.com/")

    add_page(cat=django_cat,
        title="How to Tango with Django",
        url="http://www.tangowithdjango.com/")

    frame_cat = add_cat("Other Frameworks")

    add_page(cat=frame_cat,
        title="Bottle",
        url="http://bottlepy.org/docs/dev/")

    add_page(cat=frame_cat,
        title="Flask",
        url="http://flask.pocoo.org")

    for c in Category.objects.all():
        for p in Page.objects.filter(category = c):
            print "- {0} - {1}".format(str(c),str(p))

def add_page(cat,title, url, views = 0):
    p = Page.objects.get_or_create(category = cat, title = title, url = url, views = views)[0]
    return p;

def add_cat(name):
    c = Category.objects.get_or_create(name = name)[0]
    return c

if __name__ == '__main__':
    print "Starting rango population script..."
    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "DjangoHelloworld.settings");
    django.setup()  #添加的代码
    from HelloWorld.models import Category,Page
    populate()