python九九乘法表，直角三角形

打印九九乘法表：

for i in range(1, 10):
    for j in range(1, i+1):
        print(j, "*", i, "=", i*j, end=" ")
    print("")

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 

打印直角三角形：

n = 5

for i in range(n):
    for j in range(i+1):
        print("*", end="")
    print("")

输出结果：

*
**
***
****
*****

打印倒直角三角形：

n = 5

for i in range(n):
    for j in range(n-i):
        print("*", end="")
    print("")

输出结果：

*****
****
***
**
*