猴子吃桃子，每天吃一半多一个，最后一天剩下1个；打印菱形

# 猴子吃桃子，每天吃一半多一个，最后一天剩下1个
def eat_peach(day):
    if day == 1:
        return 1
    else:
        return (eat_peach(day-1)+1)*2
        
if __name__ == "__main__":
    print(eat_peach(10))

# 题目:打印出如下图案（菱形)
def print_xin_hao(n):
    if n % 2 == 1:
        for i in range(1, n+1, 2):
            a = int((n-i)/2)
            print(' '*a + '*'*i)

        for i in range(n-2, 0, -2):
            a = int((n - i) / 2)
            print(' ' * a + '*' * i)
    else:
        print('请检测输入的数字，是否为奇数')

if __name__ == "__main__":
    print(print_xin_hao(11))