编写程序，用循环结构输出如下图形： * *** ***** *** *

for i in range(1, 6):
    for j in range(1, 6-i):
        print(" ", end="")
    for k in range(1, 2*i):
        print("*", end="")
    print()
for i in range(4, 0, -1):
    for j in range(1, 6-i):
        print(" ", end="")
    for k in range(1, 2*i):
        print("*", end="")
    print()

输出结果为：

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