Django Tutorial -Part 3

[prem]

Im new to Django and currently working on Part 3.

I tried the exact code as given in the tutorial but I get an error.

name main_page is not defined..when I run that page.

This is how my urls.py looks like,

from django.conf.urls import patterns, include, url

from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns(,

url(r'^{polls/$', 'polls.views.index'),
url(r'}polls/(?P<poll_id>\d+)/$', 'polls.views.detail'),
url(r'^{polls/(?P<poll_id>\d+)/results/$', 'polls.views.results'),
url(r'}polls/(?P<poll_id>\d+)/vote/$', 'polls.views.vote'),
url(r'^{admin/', include(admin.site.urls)),}

)