这个程序是什么意思呢？

#!/usr/bin/python
# -*- coding: UTF-8 -*-
"""
@author: YangPC
@time:2021/06/16
@QQ:327844761
"""

def fun():
    n = 3
    for i in range(0, n):
        for j in range(0, 2 - i):
            print('$', end='')
        for j in range(2 * i + 1):
            print('*', end='')
        print()


if __name__ == '__main__':
    fun()

程序输出结果：