Class based views for Django? (or other Python framework)

classbaseview.py

from django.http import HttpResponse
from django.template.loaders.app_directories import app_template_dirs
from django.template import TemplateDoesNotExist, RequestContext
from django.core import urlresolvers
from django.conf import settings

from jinja2 import Environment, FileSystemLoader, TemplateNotFound


class View(object):
    def __new__(cls, *ar, **kw):
        return super(View, cls).__new__(cls)(*ar, **kw)

    def __call__(self, request, *ar, **kw):
        pass


class TemplateView(View):
    def __call__(self, request, *ar, **kw):
        self.request = request
        try:
            ctx = self.get_ctx(*ar, **kw)
        except AttributeError:
            ctx = {}

        env = Environment(loader=FileSystemLoader(
            app_template_dirs + settings.TEMPLATE_DIRS
        ))

        env.globals['url_for'] = urlresolvers.reverse
        env.globals['MEDIA_URL'] = settings.MEDIA_URL
        env.globals['STATIC_URL'] = settings.STATIC_URL

        try:
            template = env.get_template(self.template)
        except TemplateNotFound:
            raise TemplateDoesNotExist(self.template)
        context = RequestContext(request).update(ctx)
        return HttpResponse(template.render(context))


class JSONView(View):
    def make_json(self, data):
        if hasattr(self, 'simple') and self.simple:
            from django.utils import simplejson
            return simplejson.dumps(data)
        else:
            from django.core import serializers
            return serializers.serialize('json', data)

    def __call__(self, request, *ar, **kw):
        return HttpResponse(
            self.make_json(self.get_data()),
            mimetype='application/json'
        )