2018-11-03-A-tree-by-python.md

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      "        *\n",
      "       ***\n",
      "      *****\n",
      "     *******\n",
      "    *********\n",
      "   ***********\n",
      "  *************\n",
      " ***************\n",
      "*****************\n"
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   "source": [
    "for i in range(1,10):\n",
    "               print(\" \"*(9-i)+\"*\"*(2*i-1))"
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