def lookup_method(self, new_class, new_method):
    'Translate a new class name and a new method into the old class\n        name and the old method name.'
    if (new_class in self.classes_dict):
        (old_class, class_dict) = self.classes_dict[new_class]
        if (new_method in class_dict):
            return class_dict[new_method]
    return None
Translate a new class name and a new method into the old class
name and the old method name.
def lookup_method(self, new_class, new_method):
    'Translate a new class name and a new method into the old class\n        name and the old method name.'
    if (new_class in self.classes_dict):
        (old_class, class_dict) = self.classes_dict[new_class]
        if (new_method in class_dict):
            return class_dict[new_method]
    return None