def find_object(obj, remainder, notfound_handlers, request):
    '''
    'Walks' the url path in search of an action for which a controller is
    implemented and returns that controller object along with what's left
    of the remainder.
    '''
    prev_obj = None
    while True:
        if obj is None:
            raise PecanNotFound
        if iscontroller(obj):
            if getattr(obj, 'custom_route', None) is None:
                return obj, remainder

        _detect_custom_path_segments(obj)

        if remainder:
            custom_route = __custom_routes__.get((obj.__class__, remainder[0]))
            if custom_route:
                return getattr(obj, custom_route), remainder[1:]

        # are we traversing to another controller
        cross_boundary(prev_obj, obj)
        try:
            next_obj, rest = remainder[0], remainder[1:]
            if next_obj == '':
                index = getattr(obj, 'index', None)
                if iscontroller(index):
                    return index, rest
        except IndexError:
            # the URL has hit an index method without a trailing slash
            index = getattr(obj, 'index', None)
            if iscontroller(index):
                raise NonCanonicalPath(index, [])

        default = getattr(obj, '_default', None)
        if iscontroller(default):
            notfound_handlers.append(('_default', default, remainder))

        lookup = getattr(obj, '_lookup', None)
        if iscontroller(lookup):
            notfound_handlers.append(('_lookup', lookup, remainder))

        route = getattr(obj, '_route', None)
        if iscontroller(route):
            if len(getargspec(route).args) == 2:
                warnings.warn(
                    (
                        "The function signature for %s.%s._route is changing "
                        "in the next version of pecan.\nPlease update to: "
                        "`def _route(self, args, request)`." % (
                            obj.__class__.__module__,
                            obj.__class__.__name__
                        )
                    ),
                    DeprecationWarning
                )
                next_obj, next_remainder = route(remainder)
            else:
                next_obj, next_remainder = route(remainder, request)
            cross_boundary(route, next_obj)
            return next_obj, next_remainder

        if not remainder:
            raise PecanNotFound

        prev_remainder = remainder
        prev_obj = obj
        remainder = rest
        try:
            obj = getattr(obj, next_obj, None)
        except UnicodeEncodeError:
            obj = None

        # Last-ditch effort: if there's not a matching subcontroller, no
        # `_default`, no `_lookup`, and no `_route`, look to see if there's
        # an `index` that has a generic method defined for the current request
        # method.
        if not obj and not notfound_handlers and hasattr(prev_obj, 'index'):
            if request.method in _cfg(prev_obj.index).get('generic_handlers',
                                                          {}):
                return prev_obj.index, prev_remainder
'Walks' the url path in search of an action for which a controller is
    implemented and returns that controller object along with what's left
    of the remainder.