python写出各种三角形和九九乘法表

1.直角三角形：

i = 1
while i<=5:
    j = 1
    while j <= i:
        print("*",end='')
        j+=1
    print('\n')
    i += 1

2.等腰三角形：

n = 5
for i in range(1,n+1):
    for j in range(1,n+i):
        if j < (n-i+1):
            print(' ',end='')
        else:
            print("*",end='')
    print('')

3.等边三角形

n = 5
for i in range(1, n + 1):
    for j in range(1, n - i+1):
        print(' ', end='')
    print('* '*i)

4.九九乘法表：

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