# http://www.testingperspective.com/wiki/doku.php/collaboration/chetan/designpatternsinpython/chain-of-responsibilitypattern

class Handler:
    def successor(self, successor):
        self.successor = successor

class ConcreteHandler1(Handler):
    def handle(self, request):
        if request > 0 and request  10 and request  20 and request