python作业在线等。。谢谢

Question

输入一个数，0<n<10,打印一个三角形，这样的

1

12

123

1234

123

12

1

Answer 1

number = int(input("请输入一个正整数："))
print("打印结果如下：")
number_list = []
for num in range(1, number+1):
    number_list.append(num)

for i in range(1, number*2+1):
    if i <= number:
        for x in number_list[:i]:
            print(x, end=' ')
    else:
        for x in number_list[:number-i]:
            print(x, end=' ')
    print('\n')