用Python打印形状

def shape(n):    for i in range(2*n+ 1):        if (i < n): print "$" * (n - i) + "*" * 2 * i + "$" * (n - i)        elif i == n: print "*" * 2 * n        elif i > n: print "&" * (i - n) + "*" * 2 *  (2* n - i) + "&" * (i - n)