python九九乘法表逆序_用Python打印九九乘法表正三角和倒三角。

网上看到一道作业，用Python打印九九乘法表正三角和倒三角。

正三角输出：

for i in range(1,10):

for j in range(1,i+1):

if(i==j):

print(j,"*",i,"=",i*j)

else:

if(i*j>9):

print(j,"*",i,"=",i*j,end=" ")

else:

print(j,"*",i,"=",i*j,end=" ")

输出结果：

1 * 1 = 1

1 * 2 = 2 2 * 2 = 4

1 * 3 = 3 2 * 3 = 6 3 * 3 = 9

1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16

1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25

1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36

1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49

1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64

1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9 * 9 = 81

倒三角输出：

for i in range(-9,0):

for j in range(1,10):

if(j==i*(-1)):

print(j,"*",i*(-1),"=",i*j*(-1))

break

else:

if(i*j*(-1)>9):

print(j,"*",i*(-1),"=",i*j*(-1),end=" ")

else:

print(j,"*",i*(-1),"=",i*j*(-1),end=" ")

输出结果：

1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9 * 9 = 81

1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64

1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49

1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36

1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25

1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16

1 * 3 = 3 2 * 3 = 6 3 * 3 = 9

1 * 2 = 2 2 * 2 = 4

1 * 1 = 1