input_list = [1] tem_list = [] while(True): tem_list.clear() tem_list.append(1) if len(input_list)> 1: for i in range(len(input_list)-1): tem_list.append(input_list[i]+input_list[i+1]) tem_list.append(1) print(tem_list) else: tem_list.append(1) print(tem_list) input_list = tem_list[:]