打印菱形的2种方式

方案一

n = 4
for i in range(2*n-1):
    if i < n:
        number = 2 * i +1
    else:
       number = 2*(2*n-1-i)-1
    print(('*' * number).center(2*n-1, " "))

方案二

n = 4
_max = 2 * n - 1
a = [("*"*e).center(_max," ")for e in [2*i - 1 if i<=n else 4*n-2*i-1 for i in range(1, _max+1)]]
for each in a:
    print(each)