Python 函数实现图形打印：按规则生成星号图案

"def print_pattern(n):\n for i in range(1, n+1):\n for j in range(1, 2i):\n print("", end="")\n print()\n for i in range(n-1, 0, -1):\n for j in range(1, 2i):\n print("", end="")\n print()\n\n# 测试样例\nprint_pattern(1)\nprint_pattern(2)\nprint_pattern(3)\nprint_pattern(4)\n\