n = 6
number = 0
for i in range(n + 1):
if number > 9:
break
for b in range(n + 1 - i):
print(' ', end='')
for c in range(i):
print(number, end=' ')
number += 1
print()
number = 9
for a in range(n - 1, 0, -1):
for j in range(0, n - a + 2):
print(end=' ')
for k in range(0, a-1):
print(number, end=' ')
number -= 1
print()
运行结果: