dec.py

import inspect

REQUEST = object()

def super_dec(obj):
    if inspect.isclass(obj):
        _original_dispatch = obj.dispatch
        def _wrapped_dispatch(self, request, *args, **kwargs):
            print "calling wrapped CBV-style dispatch"
            assert request is REQUEST
            return _original_dispatch(self, request, *args, **kwargs)
        obj.dispatch = _wrapped_dispatch
        return obj
    
    def _inner(*args, **kwargs):
        if args[0] is REQUEST:
            print "calling wrapped function view"
            return obj(*args, **kwargs)

        else:
            print "calling wrapped method"
            assert args[1] is REQUEST
            return obj(*args, **kwargs)

    return _inner

@super_dec
def function_view(request):
    assert request is REQUEST

@super_dec
def function_view_nonstandard_names(req):
    assert req is REQUEST

class ClassViewStyleOne(object):
    @super_dec
    def view_method(self, request):
        assert request is REQUEST

    @super_dec
    def view_method_weird_names(s, req):
        assert req is REQUEST

@super_dec
class ClassViewStyleTwo(object):
    def dispatch(self, request):
        assert request is REQUEST


function_view(REQUEST)
function_view_nonstandard_names(REQUEST)
ClassViewStyleOne().view_method(REQUEST)
ClassViewStyleTwo().dispatch(REQUEST)