def __contains__(self, item):
    'Override to not process some items.'
    if (item in self.skip_list):
        return True
    else:
        return super(SkipList, self).__contains__(item)
Override to not process some items.
def __contains__(self, item):
    
    if (item in self.skip_list):
        return True
    else:
        return super(SkipList, self).__contains__(item)