第一种 傻瓜版

for i in range(1,5):
    num1 = (4 - i) * " "
    num2 = (2*i-1) * "*"
    print(num1+num2)

for i in range(3,0,-1):
    num1 = (4 - i) * " "
    num2 = (2 * i - 1) * "*"
    print(num1 + num2)

第二种 稍微有脑子版

for i in range(-3,4):
    if i < 0:
        presapce = -i
    else:
        presapce = i
    print(" " * presapce + "*"*(7-presapce*2))

image.png