No module named django.core.management

If you're following django's tutorial, and got stuck here.

$ python manage.py startapp polls
Traceback (most recent call last):
  File "manage.py", line 2, in <module>
    from django.core.management import execute_manager
ImportError: No module named django.core.management

do

port contents py25-django

and you'll see django is installed in "/opt/local/lib/python2.5/site-packages/django". so just link it to osX's python's folder.

cd /Library/Python/2.5/site-packages
ln -s /opt/local/lib/python2.5/site-packages/django django

name 'admin' is not defined

In tutorial page 2, after you setup admin site, I get "name 'admin' is not defined" then a stacktrace.
add line from django.contrib import admin to the urls.py. so the file looks like below:

from django.conf.urls.defaults import *
from django.contrib import admin 

# Uncomment the next two lines to enable the admin:
# from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
    # Example:
    # (r'^django01/', include('django01.foo.urls')),

    # Uncomment the admin/doc line below and add 'django.contrib.admindocs' 
    # to INSTALLED_APPS to enable admin documentation:
    (r'^admin/doc/', include('django.contrib.admindocs.urls')),

    # Uncomment the next line to enable the admin:
    (r'^admin/', include(admin.site.urls)),

)