KeyError at /admin/

'loggedin'

def log_user_in(request):
    if request.method=='POST':
        uname = request.POST['username']
        password = request.POST['password']
        user = authenticate(username=uname, password=password)
        form = LoginForm(request.POST)
        if form.is_valid():
            if user is not None:
                request.session['loggedin']="djangoo"
                login(request, user)
                return HttpResponseRedirect('/admin/')
    else:
        form = LoginForm()

    return render_to_response('login.html',{'form':form,},context_instance=RequestContext(request))

def log_user_out(request):
    user = request.user
    try:
        del request.session['loggedin']
    except KeyError:
        pass
    logout(request)
    return HttpResponseRedirect('/blog/%s/'%(user))

def admin_view(request):

    if request.session['loggedin'] == "djangoo":
    #other codes..

urlpatterns = patterns('blog.views',
    url(r'^superadmin/', include(admin.site.urls)),

    url(r'^blog/(?P<username>[-w]+)/$',view='index', name='index'),
    url(r'^blog/(?P<username>[-w]+)/post/(?P<postslug>[-w]+)',view='single_post', name='view_blog_post'),
    url(r'^login/$', view='log_user_in'), # i log in to admin page from this url
    url(r'^admin/$', view='admin_view', name='admin'),# to this url
    url(r'^admin/logout/$', view='log_user_out', name='logout'),
    url(r'^admin/post/add/$', view='add_post',name='addpost'),
    url(r'^admin/post/edit/(?P<post_id>d+)', view='edit_post', name='editpost'),
    url(r'^admin/post/delete/(?P<post_id>d+)', view='delete_post', name='deletePost'),

)

`loggedin` in request.session

def admin_view(request):

    if `loggedin` in request.session and request.session['loggedin'] == "djangoo":
    #other codes..

if request.session.get('loggedin') == 'djangoo'