等腰三角形

打印直角三角形

row=1
while row<=7:
    j=1
    while j<=row:
        print('*',end=' ')
        j+=1
        pass
    print()
    row+=1
    pass

运行结果： 

打印等腰三角形

row=1
while row<=10:
    j=1
    while j<=10-row:
        print(' ',end='')
        j+=1
        pass
    k=1
    while k<=2*row-1:
        print('*',end='')
        k+=1
        pass
    print()
    row+=1
    pass

运行结果：