{"id":2259,"date":"2026-04-30T13:58:46","date_gmt":"2026-04-30T05:58:46","guid":{"rendered":"http:\/\/www.preluna.xyz\/?p=2259"},"modified":"2026-04-30T13:58:47","modified_gmt":"2026-04-30T05:58:47","slug":"eval","status":"publish","type":"post","link":"http:\/\/www.preluna.xyz\/index.php\/2026\/04\/30\/eval\/preluna\/text\/","title":{"rendered":"eval()"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">eval() \u51fd\u6570\u662f\u5e72\u4ec0\u4e48\u7684<\/h2>\n\n\n\n<p><code>eval()<\/code> \u7684\u4f5c\u7528\u53ef\u4ee5\u5148\u7528\u4e00\u53e5\u8bdd\u7406\u89e3\uff1a<\/p>\n\n\n\n<p><strong>eval() \u4f1a\u628a\u201c\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684 Python \u8868\u8fbe\u5f0f\u201d\u5f53\u6210\u771f\u6b63\u7684 Python \u8868\u8fbe\u5f0f\u6765\u6267\u884c\uff0c\u5e76\u8fd4\u56de\u6267\u884c\u7ed3\u679c\u3002<\/strong><\/p>\n\n\n\n<p>\u6ce8\u610f\u8fd9\u91cc\u6709\u4e24\u4e2a\u5173\u952e\u8bcd\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5b57\u7b26\u4e32\u5f62\u5f0f<\/strong><\/li>\n\n\n\n<li><strong>\u8868\u8fbe\u5f0f<\/strong><\/li>\n<\/ol>\n\n\n\n<p>\u6bd4\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>result = eval(\"1 + 2 + 3\")\nprint(result)\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>6\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc <code>\"1 + 2 + 3\"<\/code> \u672c\u6765\u53ea\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u4f46 <code>eval()<\/code> \u4f1a\u628a\u5b83\u5f53\u6210\u771f\u6b63\u7684 Python \u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 + 2 + 3\n<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u8ba1\u7b97\u51fa\u7ed3\u679c <code>6<\/code>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u57fa\u672c\u8bed\u6cd5<\/h2>\n\n\n\n<p><code>eval()<\/code> \u6700\u57fa\u7840\u7684\u5199\u6cd5\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(expression)\n<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>expression\n<\/code><\/pre>\n\n\n\n<p>\u901a\u5e38\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8fd9\u4e2a\u5b57\u7b26\u4e32\u91cc\u9762\u5199\u7684\u662f Python \u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"3 + 5\")\neval(\"10 * 2\")\neval(\"'hello' + 'world'\")\neval(\"&#91;1, 2, 3]\")\n<\/code><\/pre>\n\n\n\n<p>\u5b83\u4eec\u5206\u522b\u76f8\u5f53\u4e8e\u6267\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>3 + 5\n10 * 2\n'hello' + 'world'\n&#91;1, 2, 3]\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">eval() \u7684\u6267\u884c\u8fc7\u7a0b<\/h2>\n\n\n\n<p>\u6bd4\u5982\u8fd9\u53e5\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = eval(\"10 + 20\")\n<\/code><\/pre>\n\n\n\n<p>\u7a0b\u5e8f\u4f1a\u8fd9\u6837\u6267\u884c\uff1a<\/p>\n\n\n\n<p>\u7b2c\u4e00\u6b65\uff0c\u770b\u5230\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\"10 + 20\"\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e8c\u6b65\uff0c<code>eval()<\/code> \u53bb\u6389\u5b57\u7b26\u4e32\u5916\u9762\u7684\u5f15\u53f7\uff0c\u628a\u91cc\u9762\u7684\u5185\u5bb9\u5f53\u6210 Python \u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10 + 20\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e09\u6b65\uff0cPython \u8ba1\u7b97\u8fd9\u4e2a\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>30\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u56db\u6b65\uff0c\u628a\u7ed3\u679c\u8d4b\u503c\u7ed9\u53d8\u91cf <code>x<\/code>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 30\n<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(x)\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>30\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u6700\u5c0f\u53ef\u8fd0\u884c\u4f8b\u5b50<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>s = \"100 + 200\"\n\nresult = eval(s)\n\nprint(result)\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>300\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u8981\u6ce8\u610f\uff0c<code>s<\/code> \u91cc\u9762\u4fdd\u5b58\u7684\u662f\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\"100 + 200\"\n<\/code><\/pre>\n\n\n\n<p>\u4f46\u662f\u7ecf\u8fc7\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(s)\n<\/code><\/pre>\n\n\n\n<p>\u4ee5\u540e\uff0c\u5b83\u5c31\u88ab\u5f53\u6210\u4e86\u771f\u6b63\u7684\u8ba1\u7b97\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>100 + 200\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">eval() \u7684\u51e0\u4e2a\u7279\u70b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. eval() \u4f1a\u8fd4\u56de\u7ed3\u679c<\/h3>\n\n\n\n<p><code>eval()<\/code> \u4e0d\u662f\u5355\u7eaf\u201c\u6267\u884c\u4e00\u4e0b\u201d\uff0c\u5b83\u4f1a\u628a\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u8fd4\u56de\u51fa\u6765\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>result = eval(\"3 * 4\")\nprint(result)\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>12\n<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\u5b83\u5e38\u5e38\u4f1a\u914d\u5408\u53d8\u91cf\u4f7f\u7528\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>result = eval(...)\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. eval() \u53ea\u80fd\u6267\u884c\u201c\u8868\u8fbe\u5f0f\u201d\uff0c\u4e0d\u80fd\u6267\u884c\u666e\u901a\u8bed\u53e5<\/h3>\n\n\n\n<p>\u8fd9\u662f\u521d\u5b66\u8005\u5f88\u5bb9\u6613\u6df7\u6dc6\u7684\u4e00\u70b9\u3002<\/p>\n\n\n\n<p>\u8868\u8fbe\u5f0f\u662f\u201c\u6709\u7ed3\u679c\u7684\u4ee3\u7801\u201d\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\u8fd9\u4e9b\u662f\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 + 2\n\"hello\"\n&#91;1, 2, 3]\nlen(\"abc\")\n<\/code><\/pre>\n\n\n\n<p>\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u7ed3\u679c\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u4e0b\u9762\u8fd9\u4e9b\u4e0d\u662f\u8868\u8fbe\u5f0f\uff0c\u800c\u662f\u8bed\u53e5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>a = 10\nif a &gt; 5:\n    print(a)\nfor i in range(3):\n    print(i)\n<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"1 + 2\")\n<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"a = 10\")\n<\/code><\/pre>\n\n\n\n<p>\u4e0d\u53ef\u4ee5\uff0c\u4f1a\u62a5\u9519\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3a\u8d4b\u503c\u8bed\u53e5\u4e0d\u662f\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. eval() \u53ef\u4ee5\u628a\u5b57\u7b26\u4e32\u8f6c\u6210\u5217\u8868\u3001\u5143\u7ec4\u3001\u5b57\u5178\u7b49 Python \u5bf9\u8c61<\/h3>\n\n\n\n<p>\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>s = \"&#91;1, 2, 3]\"\n\nresult = eval(s)\n\nprint(result)\nprint(type(result))\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;1, 2, 3]\n&lt;class 'list'&gt;\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc <code>\" [1, 2, 3] \"<\/code> \u672c\u6765\u662f\u5b57\u7b26\u4e32\uff0c\u7ecf\u8fc7 <code>eval()<\/code> \u4e4b\u540e\uff0c\u53d8\u6210\u4e86\u771f\u6b63\u7684\u5217\u8868\u3002<\/p>\n\n\n\n<p>\u518d\u6bd4\u5982\u5b57\u5178\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>s = \"{'name': 'Tom', 'age': 18}\"\n\ndata = eval(s)\n\nprint(data)\nprint(type(data))\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>{'name': 'Tom', 'age': 18}\n&lt;class 'dict'&gt;\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. eval() \u53ef\u4ee5\u4f7f\u7528\u5f53\u524d\u7a0b\u5e8f\u4e2d\u5df2\u7ecf\u5b58\u5728\u7684\u53d8\u91cf<\/h3>\n\n\n\n<p>\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>a = 10\nb = 20\n\nresult = eval(\"a + b\")\n\nprint(result)\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>30\n<\/code><\/pre>\n\n\n\n<p>\u56e0\u4e3a\u7a0b\u5e8f\u91cc\u5df2\u7ecf\u6709\u53d8\u91cf <code>a<\/code> \u548c <code>b<\/code>\uff0c\u6240\u4ee5 <code>eval(\"a + b\")<\/code> \u4f1a\u628a\u5b57\u7b26\u4e32\u91cc\u9762\u7684 <code>a + b<\/code> \u5f53\u6210\u771f\u6b63\u7684\u8868\u8fbe\u5f0f\u6765\u8ba1\u7b97\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">eval() \u548c input() \u7ecf\u5e38\u4e00\u8d77\u51fa\u73b0<\/h2>\n\n\n\n<p>\u6709\u4e9b\u9898\u76ee\u4f1a\u8fd9\u6837\u5199\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = eval(input())\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u5199\u6cd5\u5bf9\u521d\u5b66\u8005\u6765\u8bf4\u6bd4\u8f83\u7ed5\uff0c\u62c6\u5f00\u770b\u5c31\u6e05\u695a\u4e86\u3002<\/p>\n\n\n\n<p>\u5047\u8bbe\u7528\u6237\u8f93\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 + 2 + 3\n<\/code><\/pre>\n\n\n\n<p>\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = eval(input())\n<\/code><\/pre>\n\n\n\n<p>\u6267\u884c\u8fc7\u7a0b\u662f\uff1a<\/p>\n\n\n\n<p>\u7b2c\u4e00\u6b65\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>input()\n<\/code><\/pre>\n\n\n\n<p>\u63a5\u6536\u7528\u6237\u8f93\u5165\uff0c\u5f97\u5230\u7684\u662f\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\"1 + 2 + 3\"\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e8c\u6b65\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"1 + 2 + 3\")\n<\/code><\/pre>\n\n\n\n<p>\u628a\u8fd9\u4e2a\u5b57\u7b26\u4e32\u5f53\u6210\u8868\u8fbe\u5f0f\u8ba1\u7b97\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e09\u6b65\uff0c\u5f97\u5230\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>6\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u56db\u6b65\uff0c\u8d4b\u503c\u7ed9 <code>x<\/code>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 6\n<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = eval(input())\nprint(x)\n<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u8f93\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 + 2 + 3\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\u5c31\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>6\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">eval() \u548c int(input()) \u7684\u533a\u522b<\/h2>\n\n\n\n<p>\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u533a\u522b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">int(input())<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>n = int(input())\n<\/code><\/pre>\n\n\n\n<p>\u9002\u5408\u7528\u6237\u8f93\u5165\u4e00\u4e2a\u6574\u6570\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>123\n<\/code><\/pre>\n\n\n\n<p>\u5b83\u7684\u610f\u601d\u662f\uff1a<\/p>\n\n\n\n<p>\u5148\u7528 <code>input()<\/code> \u5f97\u5230\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\"123\"\n<\/code><\/pre>\n\n\n\n<p>\u518d\u7528 <code>int()<\/code> \u8f6c\u6210\u6574\u6570\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>123\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">eval(input())<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>x = eval(input())\n<\/code><\/pre>\n\n\n\n<p>\u9002\u5408\u7528\u6237\u8f93\u5165\u4e00\u4e2a Python \u8868\u8fbe\u5f0f\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 + 2 * 3\n<\/code><\/pre>\n\n\n\n<p>\u5b83\u4f1a\u628a\u8fd9\u4e2a\u8f93\u5165\u5f53\u6210\u8868\u8fbe\u5f0f\u8ba1\u7b97\uff0c\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>7\n<\/code><\/pre>\n\n\n\n<p>\u5bf9\u6bd4\u4e00\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>n = int(input())\n<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u4f60\u8f93\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 + 2 * 3\n<\/code><\/pre>\n\n\n\n<p>\u5b83\u4f1a\u62a5\u9519\uff0c\u56e0\u4e3a <code>int()<\/code> \u4e0d\u80fd\u628a <code>\"1 + 2 * 3\"<\/code> \u76f4\u63a5\u8f6c\u6210\u6574\u6570\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = eval(input())\n<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u8ba1\u7b97\u51fa\u7ed3\u679c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ece\u601d\u8def\u5230\u4ee3\u7801\uff1a\u4ec0\u4e48\u65f6\u5019\u4f1a\u60f3\u5230\u7528 eval()<\/h2>\n\n\n\n<p>\u5047\u8bbe\u9898\u76ee\u8bf4\uff1a<\/p>\n\n\n\n<p>\u7528\u6237\u4f1a\u8f93\u5165\u4e00\u4e2a Python \u8868\u8fbe\u5f0f\uff0c\u6bd4\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;1, 2, 3]\n<\/code><\/pre>\n\n\n\n<p>\u6216\u8005\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 + 2 + 3\n<\/code><\/pre>\n\n\n\n<p>\u4f60\u9700\u8981\u628a\u5b83\u5f53\u6210\u771f\u6b63\u7684 Python \u5185\u5bb9\u6765\u5904\u7406\u3002<\/p>\n\n\n\n<p>\u8fd9\u65f6\u5019\u53ef\u4ee5\u8003\u8651 <code>eval()<\/code>\u3002<\/p>\n\n\n\n<p>\u601d\u8003\u8fc7\u7a0b\u662f\uff1a<\/p>\n\n\n\n<p>\u7b2c\u4e00\u6b65\uff0c\u7528\u6237\u8f93\u5165\u7684\u5185\u5bb9\u4e00\u5b9a\u5148\u662f\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>s = input()\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e8c\u6b65\uff0c\u5982\u679c\u8fd9\u4e2a\u5b57\u7b26\u4e32\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u5408\u6cd5\u7684 Python \u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u7528 <code>eval()<\/code> \u8f6c\u6362\u6216\u8ba1\u7b97\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>value = eval(s)\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e09\u6b65\uff0c\u518d\u4f7f\u7528\u5f97\u5230\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(value)\n<\/code><\/pre>\n\n\n\n<p>\u5b8c\u6574\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>s = input()\n\nvalue = eval(s)\n\nprint(value)\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">eval() \u6700\u5927\u7684\u95ee\u9898\uff1a\u4e0d\u5b89\u5168<\/h2>\n\n\n\n<p><code>eval()<\/code> \u5f88\u65b9\u4fbf\uff0c\u4f46\u5b83\u6709\u4e00\u4e2a\u975e\u5e38\u5927\u7684\u95ee\u9898\uff1a<\/p>\n\n\n\n<p><strong>\u5b83\u4f1a\u6267\u884c\u5b57\u7b26\u4e32\u91cc\u9762\u7684 Python \u4ee3\u7801\u3002<\/strong><\/p>\n\n\n\n<p>\u5982\u679c\u8f93\u5165\u5185\u5bb9\u4e0d\u662f\u4f60\u81ea\u5df1\u63a7\u5236\u7684\uff0c\u800c\u662f\u522b\u4eba\u8f93\u5165\u7684\uff0c\u5c31\u53ef\u80fd\u6709\u5b89\u5168\u98ce\u9669\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(input())\n<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u7528\u6237\u8f93\u5165\u7684\u662f\u666e\u901a\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 + 2\n<\/code><\/pre>\n\n\n\n<p>\u8fd8\u597d\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\u5982\u679c\u7528\u6237\u8f93\u5165\u7684\u662f\u5371\u9669\u4ee3\u7801\uff0c<code>eval()<\/code> \u4e5f\u53ef\u80fd\u5c1d\u8bd5\u6267\u884c\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u5728\u771f\u5b9e\u9879\u76ee\u4e2d\uff0c\u901a\u5e38\u4e0d\u5efa\u8bae\u968f\u4fbf\u5bf9\u7528\u6237\u8f93\u5165\u4f7f\u7528 <code>eval()<\/code>\u3002<\/p>\n\n\n\n<p>\u5728\u5b66\u4e60\u9898\u76ee\u4e2d\u770b\u5230 <code>eval()<\/code>\uff0c\u591a\u6570\u662f\u56e0\u4e3a\u5e73\u53f0\u5df2\u7ecf\u9ed8\u8ba4\u8f93\u5165\u662f\u5b89\u5168\u7684\u3001\u683c\u5f0f\u662f\u89c4\u5b9a\u597d\u7684\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u521d\u5b66\u8005\u5e38\u89c1\u9519\u8bef\u4e0e\u6613\u6df7\u70b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u9519\u8bef\u4e00\uff1a\u4ee5\u4e3a eval() \u53ef\u4ee5\u6267\u884c\u6240\u6709\u4ee3\u7801<\/h3>\n\n\n\n<p>\u9519\u8bef\u7406\u89e3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"a = 10\")\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u662f\u4e0d\u884c\u7684\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3a <code>a = 10<\/code> \u662f\u8d4b\u503c\u8bed\u53e5\uff0c\u4e0d\u662f\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u9519\u8bef\u4e8c\uff1a\u5fd8\u8bb0 eval() \u7684\u53c2\u6570\u901a\u5e38\u662f\u5b57\u7b26\u4e32<\/h3>\n\n\n\n<p>\u6b63\u786e\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"1 + 2\")\n<\/code><\/pre>\n\n\n\n<p>\u4e0d\u5e38\u89c1\u5199\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(1 + 2)\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u5c31\u4e0d\u662f\u628a\u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\u4ea4\u7ed9 <code>eval()<\/code> \u4e86\u3002<\/p>\n\n\n\n<p><code>eval()<\/code> \u4e3b\u8981\u5904\u7406\u7684\u662f\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u9519\u8bef\u4e09\uff1a\u628a eval(input()) \u548c int(input()) \u6df7\u4e3a\u4e00\u8c08<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>int(input())\n<\/code><\/pre>\n\n\n\n<p>\u4e3b\u8981\u7528\u4e8e\u8f93\u5165\u6574\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(input())\n<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u7528\u4e8e\u8f93\u5165\u8868\u8fbe\u5f0f\u3001\u5217\u8868\u3001\u5143\u7ec4\u3001\u5b57\u5178\u7b49 Python \u5b57\u9762\u91cf\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\u8f93\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;1, 2, 3]\n<\/code><\/pre>\n\n\n\n<p>\u7528 <code>eval(input())<\/code> \u53ef\u4ee5\u5f97\u5230\u771f\u6b63\u7684\u5217\u8868\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u9519\u8bef\u56db\uff1a\u5728\u771f\u5b9e\u9879\u76ee\u4e2d\u968f\u4fbf\u4f7f\u7528 eval()<\/h3>\n\n\n\n<p>\u5b66\u4e60\u9898\u76ee\u91cc\u53ef\u4ee5\u89c1\u5230\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = eval(input())\n<\/code><\/pre>\n\n\n\n<p>\u4f46\u771f\u5b9e\u9879\u76ee\u4e2d\u8981\u8c28\u614e\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3a\u7528\u6237\u8f93\u5165\u4ec0\u4e48\uff0c<code>eval()<\/code> \u5c31\u53ef\u80fd\u5c1d\u8bd5\u6267\u884c\u4ec0\u4e48\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u672c\u8282\u5c0f\u7ed3<\/h2>\n\n\n\n<p><code>eval()<\/code> \u7684\u6838\u5fc3\u7279\u70b9\u662f\uff1a<\/p>\n\n\n\n<p>\u5b83\u628a\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684 Python \u8868\u8fbe\u5f0f\u53d8\u6210\u771f\u6b63\u7684 Python \u8868\u8fbe\u5f0f\uff0c\u5e76\u8fd4\u56de\u8ba1\u7b97\u7ed3\u679c\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"1 + 2\")\n<\/code><\/pre>\n\n\n\n<p>\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>3\n<\/code><\/pre>\n\n\n\n<p>\u518d\u6bd4\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"&#91;1, 2, 3]\")\n<\/code><\/pre>\n\n\n\n<p>\u7ed3\u679c\u662f\u771f\u6b63\u7684\u5217\u8868\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;1, 2, 3]\n<\/code><\/pre>\n\n\n\n<p>\u4f46\u8981\u8bb0\u4f4f\u4e24\u70b9\uff1a<\/p>\n\n\n\n<p>\u7b2c\u4e00\uff0c<code>eval()<\/code> \u53ea\u80fd\u5904\u7406\u8868\u8fbe\u5f0f\uff0c\u4e0d\u80fd\u5904\u7406\u666e\u901a\u8bed\u53e5\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e8c\uff0c<code>eval()<\/code> \u6709\u5b89\u5168\u98ce\u9669\uff0c\u4e0d\u80fd\u968f\u4fbf\u5bf9\u7528\u6237\u8f93\u5165\u4f7f\u7528\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u7ec3\u4e60<\/h2>\n\n\n\n<p>\u9898\u76ee\uff1a<\/p>\n\n\n\n<p>\u7528\u6237\u8f93\u5165\u4e00\u4e2a\u5217\u8868\u5f62\u5f0f\u7684\u5b57\u7b26\u4e32\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;10, 20, 30]\n<\/code><\/pre>\n\n\n\n<p>\u8bf7\u4f60\u628a\u5b83\u8f6c\u6362\u6210\u771f\u6b63\u7684\u5217\u8868\uff0c\u5e76\u8f93\u51fa\u8fd9\u4e2a\u5217\u8868\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n\n\n\n<p>\u63d0\u793a\uff1a<\/p>\n\n\n\n<p>\u5148\u7528 <code>input()<\/code> \u63a5\u6536\u8f93\u5165\u3002<\/p>\n\n\n\n<p>\u7136\u540e\u7528 <code>eval()<\/code> \u628a\u5b57\u7b26\u4e32\u8f6c\u6210\u771f\u6b63\u7684\u5217\u8868\u3002<\/p>\n\n\n\n<p>\u6700\u540e\u7528\u4e0b\u6807 <code>[0]<\/code> \u53d6\u51fa\u7b2c\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/04\/eval-424x1024.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"424\" height=\"1024\" data-original=\"http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/04\/eval-424x1024.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2260\"  sizes=\"auto, (max-width: 424px) 100vw, 424px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fd9\u9053\u9898\u672c\u8d28\u4e0a\u5728\u8003\u4ec0\u4e48\uff1f<\/h2>\n\n\n\n<p>\u8fd9\u9053\u9898\u4e0d\u662f\u8ba9\u4f60\u624b\u52a8\u89e3\u6790\u591a\u9879\u5f0f\uff0c\u800c\u662f\u5728\u8003 Python \u91cc\u7684 <code>eval()<\/code>\u3002<\/p>\n\n\n\n<p>\u9898\u76ee\u7ed9\u4f60\u4e24\u6837\u4e1c\u897f\uff1a<\/p>\n\n\n\n<p>\u7b2c\u4e00\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 4\n<\/code><\/pre>\n\n\n\n<p>\u8868\u793a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 1\nk = 4\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e8c\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x**3 + x**2 + x + 1\n<\/code><\/pre>\n\n\n\n<p>\u8868\u793a\u4e00\u4e2a\u591a\u9879\u5f0f\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>P(x) = x**3 + x**2 + x + 1\n<\/code><\/pre>\n\n\n\n<p>\u4f60\u7684\u4efb\u52a1\u662f\u5224\u65ad\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>P(x) == k\n<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u76f8\u7b49\uff0c\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>True\n<\/code><\/pre>\n\n\n\n<p>\u5426\u5219\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>False\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fd9\u9053\u9898\u7684\u601d\u8003\u6b65\u9aa4<\/h2>\n\n\n\n<p>\u5148\u4e0d\u8981\u6025\u7740\u5199\u4ee3\u7801\uff0c\u5148\u628a\u9898\u76ee\u7ffb\u8bd1\u6210\u4eba\u8bdd\u3002<\/p>\n\n\n\n<p>\u9898\u76ee\u8bf4\uff1a<\/p>\n\n\n\n<p>\u7ed9\u4f60\u4e00\u4e2a <code>x<\/code>\uff0c\u7ed9\u4f60\u4e00\u4e2a <code>k<\/code>\uff0c\u518d\u7ed9\u4f60\u4e00\u4e2a\u5173\u4e8e <code>x<\/code> \u7684\u8868\u8fbe\u5f0f\u3002\u4f60\u8981\u5224\u65ad\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u5728\u5f53\u524d <code>x<\/code> \u7684\u503c\u4e0b\uff0c\u8ba1\u7b97\u7ed3\u679c\u662f\u4e0d\u662f\u7b49\u4e8e <code>k<\/code>\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\u6837\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 1\nk = 4\nP = x**3 + x**2 + x + 1\n<\/code><\/pre>\n\n\n\n<p>\u4ee3\u5165 <code>x = 1<\/code>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1**3 + 1**2 + 1 + 1\n= 1 + 1 + 1 + 1\n= 4\n<\/code><\/pre>\n\n\n\n<p>\u7ed3\u679c\u7b49\u4e8e <code>k<\/code>\uff0c\u6240\u4ee5\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>True\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5173\u952e\u70b9\uff1aeval() \u662f\u5e72\u4ec0\u4e48\u7684\uff1f<\/h2>\n\n\n\n<p><code>eval()<\/code> \u7684\u4f5c\u7528\u662f\uff1a<\/p>\n\n\n\n<p>\u628a\u4e00\u4e2a\u201c\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684 Python \u8868\u8fbe\u5f0f\u201d\u5f53\u6210\u771f\u6b63\u7684 Python \u8868\u8fbe\u5f0f\u6765\u8ba1\u7b97\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>s = \"1 + 2\"\nprint(eval(s))\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>3\n<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f\uff0c<code>s<\/code> \u672c\u6765\u53ea\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\"1 + 2\"\n<\/code><\/pre>\n\n\n\n<p>\u4f46\u662f <code>eval(s)<\/code> \u4f1a\u628a\u5b83\u5f53\u6210\u771f\u6b63\u7684\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 + 2\n<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u8ba1\u7b97\u7ed3\u679c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3a\u4ec0\u4e48\u8fd9\u9898\u53ef\u4ee5\u7528 eval()\uff1f<\/h2>\n\n\n\n<p>\u56e0\u4e3a\u9898\u76ee\u7b2c\u4e8c\u884c\u76f4\u63a5\u7ed9\u4e86\u4e00\u4e2a\u5408\u6cd5\u7684 Python \u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x**3 + x**2 + x + 1\n<\/code><\/pre>\n\n\n\n<p>\u5b83\u91cc\u9762\u7528\u5230\u4e86\u53d8\u91cf <code>x<\/code>\u3002<\/p>\n\n\n\n<p>\u53ea\u8981\u6211\u4eec\u63d0\u524d\u5199\u597d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 1\n<\/code><\/pre>\n\n\n\n<p>\u90a3\u4e48\u518d\u6267\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"x**3 + x**2 + x + 1\")\n<\/code><\/pre>\n\n\n\n<p>Python \u5c31\u4f1a\u7528\u5f53\u524d\u53d8\u91cf <code>x<\/code> \u7684\u503c\u53bb\u8ba1\u7b97\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<p>\u5b8c\u6574\u7406\u89e3\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 1\n\nexpression = \"x**3 + x**2 + x + 1\"\n\nresult = eval(expression)\n\nprint(result)\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>4\n<\/code><\/pre>\n\n\n\n<p>\u56e0\u4e3a\u6b64\u65f6 <code>eval()<\/code> \u770b\u5230\u8868\u8fbe\u5f0f\u91cc\u9762\u6709 <code>x<\/code>\uff0c\u4f1a\u5230\u5f53\u524d\u4ee3\u7801\u73af\u5883\u91cc\u627e\u53d8\u91cf <code>x<\/code>\uff0c\u53d1\u73b0\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 1\n<\/code><\/pre>\n\n\n\n<p>\u4e8e\u662f\u5b8c\u6210\u8ba1\u7b97\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ee3\u7801\u600e\u4e48\u5199\uff1f<\/h2>\n\n\n\n<p>\u8fd9\u9053\u9898\u6700\u6807\u51c6\u7684\u5199\u6cd5\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x, k = map(int, input().split())\n\np = input()\n\nprint(eval(p) == k)\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u884c\u4e00\u884c\u89e3\u91ca<\/h2>\n\n\n\n<p>\u7b2c\u4e00\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x, k = map(int, input().split())\n<\/code><\/pre>\n\n\n\n<p>\u5047\u8bbe\u8f93\u5165\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1 4\n<\/code><\/pre>\n\n\n\n<p>\u5148\u770b\u91cc\u9762\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>input()\n<\/code><\/pre>\n\n\n\n<p>\u8bfb\u5165\u4e00\u6574\u884c\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\"1 4\"\n<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>split()\n<\/code><\/pre>\n\n\n\n<p>\u6309\u7167\u7a7a\u683c\u62c6\u5f00\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;\"1\", \"4\"]\n<\/code><\/pre>\n\n\n\n<p>\u518d\u7528\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>map(int, ...)\n<\/code><\/pre>\n\n\n\n<p>\u628a\u5b57\u7b26\u4e32\u8f6c\u6210\u6574\u6570\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1, 4\n<\/code><\/pre>\n\n\n\n<p>\u6700\u540e\u8d4b\u503c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 1\nk = 4\n<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\u8fd9\u4e00\u53e5\u7684\u4f5c\u7528\u662f\uff1a\u8bfb\u5165 <code>x<\/code> \u548c <code>k<\/code>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u7b2c\u4e8c\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>p = input()\n<\/code><\/pre>\n\n\n\n<p>\u5047\u8bbe\u8f93\u5165\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x**3 + x**2 + x + 1\n<\/code><\/pre>\n\n\n\n<p>\u90a3\u4e48\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>p = \"x**3 + x**2 + x + 1\"\n<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f\uff0c<code>p<\/code> \u73b0\u5728\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u7b2c\u4e09\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(eval(p) == k)\n<\/code><\/pre>\n\n\n\n<p>\u5148\u8ba1\u7b97\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(p)\n<\/code><\/pre>\n\n\n\n<p>\u4e5f\u5c31\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"x**3 + x**2 + x + 1\")\n<\/code><\/pre>\n\n\n\n<p>\u7531\u4e8e\u524d\u9762\u5df2\u7ecf\u6709\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 1\n<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\u5b83\u4f1a\u8ba1\u7b97\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1**3 + 1**2 + 1 + 1\n<\/code><\/pre>\n\n\n\n<p>\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>4\n<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u6bd4\u8f83\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>4 == k\n<\/code><\/pre>\n\n\n\n<p>\u800c <code>k = 4<\/code>\uff0c\u6240\u4ee5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>4 == 4\n<\/code><\/pre>\n\n\n\n<p>\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>True\n<\/code><\/pre>\n\n\n\n<p>\u6700\u540e\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>True\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3a\u4ec0\u4e48\u4e0d\u7528\u81ea\u5df1\u62c6\u591a\u9879\u5f0f\uff1f<\/h2>\n\n\n\n<p>\u56e0\u4e3a\u9898\u76ee\u7ed9\u7684\u7b2c\u4e8c\u884c\u672c\u8eab\u5c31\u662f Python \u80fd\u770b\u61c2\u7684\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x**3 + x**2 + x + 1\n<\/code><\/pre>\n\n\n\n<p>\u5728 Python \u91cc\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>** \n<\/code><\/pre>\n\n\n\n<p>\u8868\u793a\u4e58\u65b9\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x**3\n<\/code><\/pre>\n\n\n\n<p>\u8868\u793a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x \u7684 3 \u6b21\u65b9\n<\/code><\/pre>\n\n\n\n<p>\u9898\u76ee\u5176\u5b9e\u5c31\u662f\u60f3\u8ba9\u4f60\u4f7f\u7528 <code>eval()<\/code>\uff0c\u800c\u4e0d\u662f\u81ea\u5df1\u53bb\u89e3\u6790 <code>x**3<\/code>\u3001<code>x**2<\/code>\u3001<code>+<\/code> \u8fd9\u4e9b\u7b26\u53f7\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u6700\u5c0f\u53ef\u8fd0\u884c\u4f8b\u5b50<\/h2>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u5148\u5728\u672c\u5730\u8bd5\u8fd9\u4e2a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 1\nk = 4\n\np = \"x**3 + x**2 + x + 1\"\n\nprint(eval(p))\nprint(eval(p) == k)\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>4\nTrue\n<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u518d\u6539\u6210\u6b63\u5f0f\u8f93\u5165\u7248\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x, k = map(int, input().split())\np = input()\n\nprint(eval(p) == k)\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fd9\u9053\u9898\u7684\u5b8c\u6574\u601d\u8def\u603b\u7ed3<\/h2>\n\n\n\n<p>\u9047\u5230\u8fd9\u79cd\u9898\uff0c\u53ef\u4ee5\u8fd9\u6837\u60f3\uff1a<\/p>\n\n\n\n<p>\u7b2c\u4e00\u6b65\uff0c\u9898\u76ee\u8981\u5224\u65ad\u4ec0\u4e48\uff1f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>P(x) == k\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e8c\u6b65\uff0c\u8f93\u5165\u7ed9\u4e86\u4ec0\u4e48\uff1f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x, k\n<\/code><\/pre>\n\n\n\n<p>\u4ee5\u53ca\u4e00\u4e2a\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>P\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e09\u6b65\uff0c\u4ee3\u7801\u600e\u4e48\u505a\uff1f<\/p>\n\n\n\n<p>\u5148\u8bfb\u5165 <code>x<\/code> \u548c <code>k<\/code>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x, k = map(int, input().split())\n<\/code><\/pre>\n\n\n\n<p>\u518d\u8bfb\u5165\u8868\u8fbe\u5f0f\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>p = input()\n<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u7528 <code>eval()<\/code> \u8ba1\u7b97\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>value = eval(p)\n<\/code><\/pre>\n\n\n\n<p>\u6700\u540e\u5224\u65ad\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(value == k)\n<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\u4e5f\u53ef\u4ee5\u5199\u6210\u66f4\u6e05\u695a\u7684\u7248\u672c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x, k = map(int, input().split())\n\np = input()\n\nvalue = eval(p)\n\nprint(value == k)\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u7248\u672c\u6bd4\u4e00\u884c\u5199\u6cd5\u66f4\u9002\u5408\u521d\u5b66\u8005\u7406\u89e3\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5e38\u89c1\u9519\u8bef<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u628a <code>^<\/code> \u5f53\u6210\u4e58\u65b9<\/h3>\n\n\n\n<p>Python \u91cc\u9762\u4e58\u65b9\u4e0d\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x^3\n<\/code><\/pre>\n\n\n\n<p>\u800c\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x**3\n<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\u9898\u76ee\u91cc\u7684\u8868\u8fbe\u5f0f\u4f1a\u5199\u6210\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x**3 + x**2 + x + 1\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u5fd8\u8bb0\u628a <code>x<\/code> \u548c <code>k<\/code> \u8f6c\u6210\u6574\u6570<\/h3>\n\n\n\n<p>\u9519\u8bef\u5199\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x, k = input().split()\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u6837\u5f97\u5230\u7684\u662f\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = \"1\"\nk = \"4\"\n<\/code><\/pre>\n\n\n\n<p>\u540e\u9762\u6bd4\u8f83\u65f6\u5bb9\u6613\u51fa\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u6b63\u786e\u5199\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x, k = map(int, input().split())\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u4e0d\u7406\u89e3\u4e3a\u4ec0\u4e48 <code>eval(p)<\/code> \u8ba4\u8bc6 <code>x<\/code><\/h3>\n\n\n\n<p>\u56e0\u4e3a\u524d\u9762\u5df2\u7ecf\u5199\u4e86\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x = 1\n<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\u5f53\u524d\u7a0b\u5e8f\u73af\u5883\u91cc\u5df2\u7ecf\u6709\u53d8\u91cf <code>x<\/code>\u3002<\/p>\n\n\n\n<p>\u5f53 <code>eval()<\/code> \u8ba1\u7b97\u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\"x**3 + x**2 + x + 1\"\n<\/code><\/pre>\n\n\n\n<p>\u65f6\uff0c\u5b83\u4f1a\u4f7f\u7528\u5f53\u524d\u7684 <code>x<\/code> \u503c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u73b0\u5b9e\u5f00\u53d1\u4e2d\u4e0d\u8981\u968f\u4fbf\u7528 eval()<\/h3>\n\n\n\n<p>\u8fd9\u9053\u9898\u53ef\u4ee5\u7528 <code>eval()<\/code>\uff0c\u662f\u56e0\u4e3a HackerRank \u7684\u9898\u76ee\u8f93\u5165\u662f\u53d7\u63a7\u7684\u3002<\/p>\n\n\n\n<p>\u4f46\u5728\u771f\u5b9e\u9879\u76ee\u4e2d\uff0c\u5982\u679c\u7528\u6237\u8f93\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4e00\u4e9b\u5371\u9669\u4ee3\u7801\n<\/code><\/pre>\n\n\n\n<p><code>eval()<\/code> \u53ef\u80fd\u4f1a\u76f4\u63a5\u6267\u884c\u5b83\uff0c\u6240\u4ee5\u6709\u5b89\u5168\u98ce\u9669\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u53ef\u4ee5\u8fd9\u6837\u8bb0\uff1a<\/p>\n\n\n\n<p>\u5728\u8fd9\u9053\u9898\u91cc\uff0c<code>eval()<\/code> \u662f\u8003\u70b9\uff0c\u53ef\u4ee5\u7528\u3002<\/p>\n\n\n\n<p>\u5728\u771f\u5b9e\u9879\u76ee\u91cc\uff0c\u4e0d\u8981\u968f\u4fbf\u5bf9\u7528\u6237\u8f93\u5165\u4f7f\u7528 <code>eval()<\/code>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u7ec3\u4e60<\/h2>\n\n\n\n<p>\u9898\u76ee\uff1a<\/p>\n\n\n\n<p>\u8f93\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2 10\nx**2 + x + 4\n<\/code><\/pre>\n\n\n\n<p>\u8bf7\u4f60\u5224\u65ad\u7a0b\u5e8f\u5e94\u8be5\u8f93\u51fa\u4ec0\u4e48\u3002<\/p>\n\n\n\n<p>\u63d0\u793a\uff1a<\/p>\n\n\n\n<p>\u5148\u628a <code>x = 2<\/code> \u4ee3\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>x**2 + x + 4\n<\/code><\/pre>\n\n\n\n<p>\u518d\u770b\u8ba1\u7b97\u7ed3\u679c\u662f\u5426\u7b49\u4e8e <code>k = 10<\/code>\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/04\/eval-\u628a\u5b57\u7b26\u4e32\u5f53\u4f5c-Python-\u8868\u8fbe\u5f0f\u6267\u884c.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"934\" height=\"911\" data-original=\"http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/04\/eval-\u628a\u5b57\u7b26\u4e32\u5f53\u4f5c-Python-\u8868\u8fbe\u5f0f\u6267\u884c.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2261\"  sizes=\"auto, (max-width: 934px) 100vw, 934px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u9898\u76ee\u8003\u70b9<\/h2>\n\n\n\n<p>\u8fd9\u9053\u9898\u4e3b\u8981\u8003\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>input()<\/code> \u8bfb\u53d6\u4e00\u6574\u884c\u5b57\u7b26\u4e32<\/li>\n\n\n\n<li><code>eval()<\/code> \u628a\u5b57\u7b26\u4e32\u5f53\u4f5c Python \u8868\u8fbe\u5f0f\u6267\u884c<\/li>\n\n\n\n<li>\u7406\u89e3 <code>print(2 + 3)<\/code> \u8fd9\u79cd\u8f93\u5165\u672c\u8eab\u5c31\u4f1a\u4ea7\u751f\u8f93\u51fa<\/li>\n\n\n\n<li>\u4e0d\u8981\u989d\u5916\u591a\u5199\u4e00\u5c42 <code>print(eval(...))<\/code><\/li>\n<\/ol>\n\n\n\n<p>\u8fd9\u9898\u4e0d\u662f\u7b97\u6cd5\u9898\uff0c\u6838\u5fc3\u662f\u7406\u89e3\uff1a<strong>\u9898\u76ee\u8f93\u5165\u7684\u5185\u5bb9\u672c\u8eab\u5c31\u662f\u4e00\u6bb5 Python \u8868\u8fbe\u5f0f\uff0c\u6211\u4eec\u53ea\u9700\u8981\u8ba9 Python \u53bb\u6267\u884c\u5b83\u3002<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5ba1\u9898<\/h2>\n\n\n\n<p>\u9898\u76ee\u8bf4\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>You are given an expression in a line. Read that line as a string variable, such as <code>var<\/code>, and print the result using <code>eval(var)<\/code>.<\/p>\n<\/blockquote>\n\n\n\n<p>\u610f\u601d\u662f\uff1a<\/p>\n\n\n\n<p>\u8f93\u5165\u662f\u4e00\u884c\u5b57\u7b26\u4e32\uff0c\u6bd4\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(2 + 3)\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e00\u884c\u770b\u8d77\u6765\u50cf\u4ee3\u7801\uff0c\u4f46\u5b83\u5176\u5b9e\u662f\u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u8fdb\u6765\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<p>\u7a0b\u5e8f\u8981\u505a\u7684\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var = input()\neval(var)\n<\/code><\/pre>\n\n\n\n<p>\u5173\u952e\u70b9\u5728\u4e8e\uff1a\u8f93\u5165\u7684\u5185\u5bb9\u662f <code>print(2 + 3)<\/code>\uff0c\u5b83\u672c\u8eab\u5c31\u5e26\u6709 <code>print()<\/code>\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u6267\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"print(2 + 3)\")\n<\/code><\/pre>\n\n\n\n<p>\u7b49\u4ef7\u4e8e\u6267\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(2 + 3)\n<\/code><\/pre>\n\n\n\n<p>\u8f93\u51fa\u5c31\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>5\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u601d\u8def\u63d0\u793a<\/h2>\n\n\n\n<p>\u8fd9\u9053\u9898\u53ef\u4ee5\u6309\u4e09\u6b65\u60f3\uff1a<\/p>\n\n\n\n<p>\u7b2c\u4e00\u6b65\uff0c\u7528 <code>input()<\/code> \u8bfb\u53d6\u8fd9\u4e00\u6574\u884c\u5185\u5bb9\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\u7528\u6237\u8f93\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(2 + 3)\n<\/code><\/pre>\n\n\n\n<p>\u7a0b\u5e8f\u8bfb\u5230\u7684\u5176\u5b9e\u662f\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\"print(2 + 3)\"\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e8c\u6b65\uff0c\u628a\u8fd9\u4e2a\u5b57\u7b26\u4e32\u4ea4\u7ed9 <code>eval()<\/code>\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e09\u6b65\uff0c\u6ce8\u610f\u4e0d\u8981\u518d\u5916\u9762\u5305\u4e00\u5c42 <code>print()<\/code>\uff0c\u56e0\u4e3a\u8f93\u5165\u91cc\u7684\u8868\u8fbe\u5f0f\u53ef\u80fd\u5df2\u7ecf\u5305\u542b <code>print()<\/code>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b8c\u6574\u8bbe\u8ba1\u601d\u8def<\/h2>\n\n\n\n<p>\u8fd9\u9898\u4ee3\u7801\u5f88\u77ed\uff0c\u4f46\u5bb9\u6613\u9519\u5728\u8f93\u51fa\u65b9\u5f0f\u4e0a\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u5148\u7528\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>expression = input()\n<\/code><\/pre>\n\n\n\n<p>\u628a\u8f93\u5165\u7684\u4e00\u6574\u884c\u4fdd\u5b58\u4e0b\u6765\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u8f93\u5165\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(2 + 3)\n<\/code><\/pre>\n\n\n\n<p>\u90a3\u4e48 <code>expression<\/code> \u91cc\u9762\u5b58\u7684\u5c31\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\"print(2 + 3)\"\n<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u6267\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(expression)\n<\/code><\/pre>\n\n\n\n<p>Python \u4f1a\u628a\u5b57\u7b26\u4e32\u5185\u5bb9\u5f53\u4f5c Python \u8868\u8fbe\u5f0f\u6267\u884c\u3002<\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"print(2 + 3)\")\n<\/code><\/pre>\n\n\n\n<p>\u4f1a\u89e6\u53d1\u91cc\u9762\u7684 <code>print(2 + 3)<\/code>\uff0c\u6240\u4ee5\u5c4f\u5e55\u4e0a\u4f1a\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>5\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ee3\u7801\u5b9e\u73b0<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>if __name__ == '__main__':\n    expression = input()\n    eval(expression)\n<\/code><\/pre>\n\n\n\n<p>\u4e5f\u53ef\u4ee5\u5199\u5f97\u66f4\u77ed\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(input())\n<\/code><\/pre>\n\n\n\n<p>\u5bf9\u4e8e\u521d\u5b66\u8005\uff0c\u6211\u66f4\u5efa\u8bae\u5148\u5199\u7b2c\u4e00\u79cd\uff0c\u56e0\u4e3a\u66f4\u6e05\u695a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>expression = input()\neval(expression)\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u6837\u4f60\u80fd\u660e\u663e\u770b\u5230\uff1a\u5148\u8bfb\u5165\u5b57\u7b26\u4e32\uff0c\u518d\u6267\u884c\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e3a\u4ec0\u4e48\u4e0d\u662f\u8fd9\u6837\u5199\uff1f<\/h2>\n\n\n\n<p>\u5f88\u591a\u4eba\u4f1a\u4e0b\u610f\u8bc6\u5199\u6210\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(eval(expression))\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u5728\u672c\u9898\u91cc\u901a\u5e38\u662f\u9519\u7684\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3a\u5982\u679c\u8f93\u5165\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(2 + 3)\n<\/code><\/pre>\n\n\n\n<p>\u90a3\u4e48\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(\"print(2 + 3)\")\n<\/code><\/pre>\n\n\n\n<p>\u4f1a\u5148\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>5\n<\/code><\/pre>\n\n\n\n<p>\u4f46\u662f <code>print(2 + 3)<\/code> \u8fd9\u4e2a\u51fd\u6570\u6267\u884c\u5b8c\u4e4b\u540e\uff0c\u8fd4\u56de\u503c\u662f <code>None<\/code>\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u5982\u679c\u4f60\u5199\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(eval(\"print(2 + 3)\"))\n<\/code><\/pre>\n\n\n\n<p>\u5b9e\u9645\u8fc7\u7a0b\u662f\uff1a<\/p>\n\n\n\n<p>\u7b2c\u4e00\u6b65\uff0c\u91cc\u9762\u7684 <code>print(2 + 3)<\/code> \u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>5\n<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e8c\u6b65\uff0c<code>eval(...)<\/code> \u7684\u8fd4\u56de\u503c\u662f <code>None<\/code><\/p>\n\n\n\n<p>\u7b2c\u4e09\u6b65\uff0c\u5916\u5c42 <code>print(None)<\/code> \u53c8\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>None\n<\/code><\/pre>\n\n\n\n<p>\u6700\u7ec8\u5c31\u4f1a\u53d8\u6210\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>5\nNone\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u5c31\u548c\u9898\u76ee\u8981\u6c42\u4e0d\u4e00\u81f4\u4e86\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u672c\u9898\u53ea\u5199\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(expression)\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fd0\u884c\u6f14\u793a<\/h2>\n\n\n\n<p>\u5047\u8bbe\u8f93\u5165\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(2 + 3)\n<\/code><\/pre>\n\n\n\n<p>\u7a0b\u5e8f\u6267\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>expression = input()\n<\/code><\/pre>\n\n\n\n<p>\u6b64\u65f6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>expression = \"print(2 + 3)\"\n<\/code><\/pre>\n\n\n\n<p>\u7136\u540e\u6267\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval(expression)\n<\/code><\/pre>\n\n\n\n<p>\u7b49\u4ef7\u4e8e\u6267\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>print(2 + 3)\n<\/code><\/pre>\n\n\n\n<p>\u6240\u4ee5\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>5\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u65b9\u6cd5\u603b\u7ed3<\/h2>\n\n\n\n<p>\u8fd9\u7c7b\u9898\u4e0b\u6b21\u53ef\u4ee5\u8fd9\u6837\u5224\u65ad\uff1a<\/p>\n\n\n\n<p>\u5982\u679c\u9898\u76ee\u8bf4\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u8f93\u5165\u7684\u662f\u4e00\u6bb5 Python \u8868\u8fbe\u5f0f\uff0c\u8ba9\u4f60\u7528 <code>eval()<\/code> \u6267\u884c<\/p>\n<\/blockquote>\n\n\n\n<p>\u90a3\u4e48\u57fa\u672c\u5957\u8def\u5c31\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>expression = input()\neval(expression)\n<\/code><\/pre>\n\n\n\n<p>\u91cd\u70b9\u4e0d\u662f\u5faa\u73af\u3001\u5224\u65ad\u3001\u5217\u8868\uff0c\u800c\u662f\u7406\u89e3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>input()\n<\/code><\/pre>\n\n\n\n<p>\u8bfb\u5230\u7684\u662f\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>eval()\n<\/code><\/pre>\n\n\n\n<p>\u4f1a\u628a\u8fd9\u4e2a\u5b57\u7b26\u4e32\u5f53\u6210 Python \u8868\u8fbe\u5f0f\u6267\u884c\u3002<\/p>\n\n\n\n<p>\u672c\u9898\u6700\u5bb9\u6613\u9519\u7684\u5730\u65b9\u662f\uff1a<strong>\u4e0d\u8981\u5199\u6210 <code>print(eval(input()))<\/code>\u3002<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u7ec3\u4e60<\/h2>\n\n\n\n<p>\u8bf7\u601d\u8003\u4e0b\u9762\u8fd9\u9053\u7c7b\u4f3c\u5c0f\u7ec3\u4e60\u3002<\/p>\n\n\n\n<p>\u8f93\u5165\u4e00\u884c Python \u8868\u8fbe\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>len(\"hello\")\n<\/code><\/pre>\n\n\n\n<p>\u8981\u6c42\u7a0b\u5e8f\u6267\u884c\u8fd9\u4e2a\u8868\u8fbe\u5f0f\uff0c\u5e76\u6253\u5370\u6267\u884c\u7ed3\u679c\u3002<\/p>\n\n\n\n<p>\u63d0\u793a\uff1a<\/p>\n\n\n\n<p>\u8fd9\u6b21\u8f93\u5165\u91cc\u9762\u6ca1\u6709\u81ea\u5e26 <code>print()<\/code>\uff0c\u6240\u4ee5\u4f60\u9700\u8981\u601d\u8003\uff1a\u5e94\u8be5\u5199 <code>eval(input())<\/code>\uff0c\u8fd8\u662f <code>print(eval(input()))<\/code>\uff1f<\/p>\n","protected":false},"excerpt":{"rendered":"<p>eval() \u51fd\u6570\u662f\u5e72\u4ec0\u4e48\u7684 eval() \u7684\u4f5c\u7528\u53ef\u4ee5\u5148\u7528\u4e00\u53e5\u8bdd\u7406\u89e3\uff1a eval() \u4f1a\u628a\u201c\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684 Py [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[],"class_list":["post-2259","post","type-post","status-publish","format-standard","hentry","category-text"],"_links":{"self":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2259","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=2259"}],"version-history":[{"count":1,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2259\/revisions"}],"predecessor-version":[{"id":2262,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2259\/revisions\/2262"}],"wp:attachment":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=2259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=2259"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=2259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}