8. 字符串转换整数 (atoi).ipynb

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    "class Solution:\n",
    "    def myAtoi(self, str: str) -> int:\n",
    "        s = str.strip()\n",
    "        temp = ''\n",
    "        if len(s) == 0:\n",
    "            return 0\n",
    "        if s[0].isdigit():\n",
    "            for i in range(len(s)):\n",
    "                if s[i].isdigit():\n",
    "                    temp += s[i]\n",
    "                else:\n",
    "                    break\n",
    "        elif s[0] == '-' or s[0] == '+':\n",
    "            temp += s[0]\n",
    "            for i in range(1,len(s)):\n",
    "                if s[i].isdigit():\n",
    "                    temp += s[i]\n",
    "                else:\n",
    "                    break\n",
    "        else:\n",
    "            return 0\n",
    "        if temp == '-' or temp == '+':\n",
    "            return 0\n",
    "        else:\n",
    "            temp = int(temp)\n",
    "        if temp > 2**31-1:\n",
    "            return 2**31-1\n",
    "        elif temp < -2**31:\n",
    "            return -2**31\n",
    "        else:\n",
    "            return temp\n",
    "        \n",
    "s = Solution()\n",
    "s.myAtoi('2147483648')"
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