使用循环编程实现以下图形： * *** ***** *** *

代码如下：

for i in range(1, 4):
    for j in range(i):
        print("*", end="")
    for k in range(2*i-2):
        print(" ", end="")
    for j in range(i):
        print("*", end="")
    print()
for i in range(2, 0, -1):
    for j in range(i):
        print("*", end="")
    for k in range(2*i-2):
        print(" ", end="")
    for j in range(i):
        print("*", end="")
    print()

输出结果为：

*  ***  * 
** ******
*********
** ******
*  ***  *