考生文件夹下存在一一个文件PY102.py，请写代码替换横线，不修改其他代码，实现以下功能:
请在屏幕上输出以下三角形:
11
121
133 1
14641
15101051
1615201561
1721I35352171
参考答案
a = []
for i in range(8):
a.append([])
for j in range(8):
a[i].append(0)
for i in range(8):#一行中开通和末尾都是0
a[i][0] = 1
a[i][i] = 1
for i in range(2,8):
for j in range(1,i):
a[i][j] = a[i-1][j-1]+a[i-1][j]
for i in range(8):
for j in range(i+1):
print("{:3d}".format(a[i][j]),end=" ")
print()
