I'm making a shopping cart app in Google App Engine. I have many classes that derive from a base handler:

class BaseHandler(webapp.RequestHandler):
    def get(self, CSIN=None):
        self.body(CSIN)

Does this mean that the body() method of every descendant class needs to have the same argument? This is cumbersome. Only one descendant actually uses that argument. And what about when I add new args? Do I need to go through and change every class?

class Detail(BaseHandler):
    def body(self, CSIN):

class MainPage(BaseHandler):
    def body(self, CSIN=None): #@UnusedVariable

class Cart(BaseHandler):
    def body(self, CSIN): #@UnusedVariable