Micro hello world Python Web Framework Royal Rumble @PyCon 7

pico.py

import django
DEBUG, ROOT_URLCONF, DATABASES, SECRET_KEY = 1, 'pico', {'default': {}}, 'p'
urlpatterns = [django.conf.urls.url(r'^(?P<name>\w+)?$', lambda request,
    name: django.http.HttpResponse('hello %s!' % (name or 'world')))]

This is great. You can cut it down to 250 characters if you just import django instead:

import django
DEBUG, ROOT_URLCONF, DATABASES, SECRET_KEY = 1, 'pico', {'default': {}}, 'p'
urlpatterns = [django.conf.urls.url(r'^(?P<name>\w+)?$', lambda request, name: django.http.HttpResponse(
    'hello {name}!'.format(name=(name or 'world'))))]

Update to your suggestion (edited a bit to fit 80 chars lines which was one of the constraints)