用python画一个菱形

if n%2==0:
    for i in range(1,n):
        if i<=n/2:
            for j in range(1, abs(n - i) + 1):
                print(end=" ")
            for k in range(1,2*i):
                print("*",end="")
        else:
            a=n/2
            b=i-a
            i=a-b
            j=1
            while j