{"id":74,"date":"2026-06-13T17:39:07","date_gmt":"2026-06-13T09:39:07","guid":{"rendered":"https:\/\/www.52runoob.com\/?p=74"},"modified":"2026-06-13T17:39:07","modified_gmt":"2026-06-13T09:39:07","slug":"python-lambda%ef%bc%88%e5%8c%bf%e5%90%8d%e5%87%bd%e6%95%b0%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.52runoob.com\/index.php\/2026\/06\/13\/python-lambda%ef%bc%88%e5%8c%bf%e5%90%8d%e5%87%bd%e6%95%b0%ef%bc%89\/","title":{"rendered":"Python lambda\uff08\u533f\u540d\u51fd\u6570\uff09"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5728 Python \u4e2d\uff0c<code>lambda<\/code> \u662f\u4e00\u79cd\u521b\u5efa<strong>\u5c0f\u578b\u533f\u540d\u51fd\u6570<\/strong>\u7684\u7b80\u6d01\u65b9\u5f0f\u3002\u5b83\u6ca1\u6709\u51fd\u6570\u540d\uff08<code>def<\/code> \u5b9a\u4e49\u7684\u51fd\u6570\u6709\u540d\u5b57\uff09\uff0c\u901a\u5e38\u7528\u4e8e\u53ea\u9700\u8981\u7b80\u5355\u903b\u8f91\u3001\u4e14\u53ea\u4f7f\u7528\u4e00\u6b21\u7684\u573a\u666f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u6211\u5c06\u4ece<strong>\u57fa\u7840\u8bed\u6cd5<\/strong>\u3001<strong>\u6838\u5fc3\u5e94\u7528\u573a\u666f<\/strong>\u3001<strong>\u5e38\u89c1\u9677\u9631<\/strong>\u5230<strong>\u6700\u4f73\u5b9e\u8df5<\/strong>\uff0c\u4e3a\u4f60\u5168\u9762\u89e3\u6790 Python \u7684 lambda \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\">1. \u57fa\u7840\u8bed\u6cd5\u4e0e\u5bf9\u6bd4<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8bed\u6cd5\u7ed3\u6784<\/strong>\uff1a<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">lambda \u53c2\u65701, \u53c2\u65702, ... : \u8868\u8fbe\u5f0f<\/code><\/pre><\/div><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u53c2\u6570<\/strong>\uff1a\u548c\u666e\u901a\u51fd\u6570\u4e00\u6837\uff0c\u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u4e5f\u53ef\u4ee5\u6709\u9ed8\u8ba4\u53c2\u6570\u3001<code>*args<\/code>\u3001<code>**kwargs<\/code>\u3002<\/li>\n\n\n\n<li><strong>\u8868\u8fbe\u5f0f<\/strong>\uff1a<strong>\u53ea\u80fd\u662f\u4e00\u4e2a\u5355\u884c\u8868\u8fbe\u5f0f<\/strong>\uff0c\u5b83\u7684\u8ba1\u7b97\u7ed3\u679c\u4f1a\u81ea\u52a8\u4f5c\u4e3a\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff08<strong>\u4e0d\u9700\u8981\u4e5f\u4e0d\u80fd\u5199 <code>return<\/code><\/strong>\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5bf9\u6bd4 <code>def<\/code><\/strong>\uff1a<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><span>8<\/span><span>9<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\"># \u4f20\u7edf\u65b9\u5f0f\ndef add(x, y):\n    return x + y\n\n# Lambda \u65b9\u5f0f\nadd_lambda = lambda x, y: x + y\n\nprint(add(2, 3))         # \u8f93\u51fa: 5\nprint(add_lambda(2, 3))  # \u8f93\u51fa: 5<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u56db\u5927\u6838\u5fc3\u5e94\u7528\u573a\u666f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Lambda \u6700\u5927\u7684\u4ef7\u503c\u5728\u4e8e<strong>\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u9ad8\u9636\u51fd\u6570<\/strong>\uff0c\u4f7f\u4ee3\u7801\u66f4\u7d27\u51d1\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u2460 \u914d\u5408\u6392\u5e8f\u51fd\u6570 (<code>sorted<\/code> \/ <code>list.sort<\/code>)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f lambda \u6700\u5e38\u89c1\u3001\u6700\u5b9e\u7528\u7684\u573a\u666f\uff0c\u7528\u4e8e\u6307\u5b9a\u81ea\u5b9a\u4e49\u7684\u6392\u5e8f\u89c4\u5219\uff08<code>key<\/code> \u53c2\u6570\uff09\u3002<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><span>8<\/span><span>9<\/span><span>10<\/span><span>11<\/span><span>12<\/span><span>13<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">students = [\n    {&quot;name&quot;: &quot;Alice&quot;, &quot;age&quot;: 22, &quot;score&quot;: 85},\n    {&quot;name&quot;: &quot;Bob&quot;, &quot;age&quot;: 20, &quot;score&quot;: 92},\n    {&quot;name&quot;: &quot;Charlie&quot;, &quot;age&quot;: 21, &quot;score&quot;: 78}\n]\n\n# \u6309\u5e74\u9f84\u5347\u5e8f\u6392\u5e8f\nsorted_by_age = sorted(students, key=lambda s: s[&quot;age&quot;])\n\n# \u6309\u5206\u6570\u964d\u5e8f\u6392\u5e8f\nsorted_by_score_desc = sorted(students, key=lambda s: s[&quot;score&quot;], reverse=True)\n\nprint(sorted_by_age[0][&quot;name&quot;])  # \u8f93\u51fa: Bob<\/code><\/pre><\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u2461 \u914d\u5408 <code>map()<\/code> (\u6620\u5c04)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u76f8\u540c\u64cd\u4f5c\uff0c\u5e76\u8fd4\u56de\u65b0\u7684\u8fed\u4ee3\u5668\u3002<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">numbers = [1, 2, 3, 4, 5]\n\n# \u5c06\u6bcf\u4e2a\u6570\u5b57\u5e73\u65b9\nsquared = list(map(lambda x: x**2, numbers))\nprint(squared)  # \u8f93\u51fa: [1, 4, 9, 16, 25]<\/code><\/pre><\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u2462 \u914d\u5408 <code>filter()<\/code> (\u8fc7\u6ee4)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b5b\u9009\u51fa\u4f7f\u8868\u8fbe\u5f0f\u7ed3\u679c\u4e3a <code>True<\/code> \u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">numbers = [1, 2, 3, 4, 5, 6]\n\n# \u53ea\u4fdd\u7559\u5076\u6570\nevens = list(filter(lambda x: x % 2 == 0, numbers))\nprint(evens)  # \u8f93\u51fa: [2, 4, 6]<\/code><\/pre><\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u2463 \u914d\u5408 <code>functools.reduce()<\/code> (\u5f52\u7ea6)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06\u5e8f\u5217\u7d2f\u79ef\u8ba1\u7b97\u4e3a\u4e00\u4e2a\u5355\u4e00\u503c\uff08\u9700\u5148 <code>from functools import reduce<\/code>\uff09\u3002<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\">from functools import reduce\n\nnumbers = [1, 2, 3, 4, 5]\n\n# \u8ba1\u7b97\u4e58\u79ef: (((1*2)*3)*4)*5\nproduct = reduce(lambda x, y: x * y, numbers)\nprint(product)  # \u8f93\u51fa: 120<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Lambda \u7684\u8fdb\u9636\u6280\u5de7\uff1a\u4e09\u5143\u8fd0\u7b97\u7b26<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a lambda <strong>\u53ea\u80fd\u5305\u542b\u4e00\u4e2a\u8868\u8fbe\u5f0f<\/strong>\uff0c\u4e0d\u80fd\u5199\u591a\u884c\u7684 <code>if-else<\/code> \u8bed\u53e5\u5757\u3002\u4f46\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Python \u7684<strong>\u6761\u4ef6\u8868\u8fbe\u5f0f\uff08\u4e09\u5143\u8fd0\u7b97\u7b26\uff09<\/strong> \u6765\u5b9e\u73b0\u5206\u652f\u903b\u8f91\u3002<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><span>8<\/span><span>9<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\"># \u5224\u65ad\u5947\u5076\u6570\ncheck_even = lambda x: &quot;\u5076\u6570&quot; if x % 2 == 0 else &quot;\u5947\u6570&quot;\n\nprint(check_even(4))  # \u8f93\u51fa: \u5076\u6570\nprint(check_even(5))  # \u8f93\u51fa: \u5947\u6570\n\n# \u83b7\u53d6\u4e24\u4e2a\u6570\u4e2d\u7684\u6700\u5927\u503c\nget_max = lambda a, b: a if a &gt; b else b\nprint(get_max(10, 20)) # \u8f93\u51fa: 20<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u26a0\ufe0f \u4e09\u5927\u5e38\u89c1\u9677\u9631\u4e0e\u9650\u5236 (\u9762\u8bd5\u9ad8\u9891)<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u9677\u9631 1\uff1a\u95ed\u5305\u4e2d\u7684\u5ef6\u8fdf\u7ed1\u5b9a (Late Binding)<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5faa\u73af\u4e2d\u521b\u5efa lambda \u51fd\u6570\u65f6\uff0clambda \u4f1a\u5f15\u7528\u5faa\u73af\u53d8\u91cf\u7684<strong>\u6700\u7ec8\u503c<\/strong>\uff0c\u800c\u4e0d\u662f\u521b\u5efa\u65f6\u7684\u503c\u3002<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\"># \u9519\u8bef\u793a\u8303\uff1a\u671f\u671b\u8f93\u51fa [0, 1, 2]\uff0c\u5b9e\u9645\u8f93\u51fa [2, 2, 2]\nfuncs = [lambda x: x + i for i in range(3)]\nprint([f(0) for f in funcs]) \n\n# \u2705 \u6b63\u786e\u89e3\u6cd5\uff1a\u4f7f\u7528\u9ed8\u8ba4\u53c2\u6570\u5f3a\u5236\u5728\u521b\u5efa\u65f6\u7ed1\u5b9a\u5f53\u524d\u503c\nfuncs_fixed = [lambda x, i=i: x + i for i in range(3)]\nprint([f(0) for f in funcs_fixed])  # \u8f93\u51fa: [0, 1, 2]<\/code><\/pre><\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u9677\u9631 2\uff1a\u8bd5\u56fe\u5728 lambda \u4e2d\u5199\u590d\u6742\u903b\u8f91<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Lambda \u4e0d\u652f\u6301\u8d4b\u503c\u8bed\u53e5 (<code>=<\/code>)\u3001<code>return<\/code>\u3001<code>pass<\/code>\u3001<code>raise<\/code> \u6216\u591a\u884c\u4ee3\u7801\u3002\u5982\u679c\u903b\u8f91\u590d\u6742\uff0c<strong>\u5fc5\u987b<\/strong>\u9000\u56de\u5230 <code>def<\/code>\u3002<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><span>8<\/span><span>9<\/span><span>10<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\"># \u274c \u8bed\u6cd5\u9519\u8bef\uff1alambda \u4e2d\u4e0d\u80fd\u6709\u8bed\u53e5\u5757\n# bad_lambda = lambda x: \n#     if x &gt; 0:\n#         return x\n\n# \u2705 \u6b63\u786e\u505a\u6cd5\uff1a\u4f7f\u7528 def\ndef good_func(x):\n    if x &gt; 0:\n        return x\n    return 0<\/code><\/pre><\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u9677\u9631 3\uff1a\u8fc7\u5ea6\u4f7f\u7528\u5bfc\u81f4\u53ef\u8bfb\u6027\u4e0b\u964d<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c lambda \u8868\u8fbe\u5f0f\u8fc7\u957f\u6216\u5d4c\u5957\u8fc7\u591a\uff0c\u4ee3\u7801\u4f1a\u53d8\u5f97\u50cf\u201c\u5929\u4e66\u201d\u3002<\/p>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><span>7<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\"># \u274c \u7cdf\u7cd5\u7684 lambda (\u96be\u4ee5\u9605\u8bfb)\ncomplex_lambda = lambda d: [k for k, v in d.items() if v &gt; 10 and isinstance(v, int)]\n\n# \u2705 \u66f4\u597d\u7684\u505a\u6cd5\uff1a\u4f7f\u7528 def \u5e76\u52a0\u4e0a\u7c7b\u578b\u63d0\u793a\u548c\u6587\u6863\ndef get_high_value_keys(data: dict) -&gt; list:\n    &quot;&quot;&quot;\u8fd4\u56de\u5b57\u5178\u4e2d\u503c\u5927\u4e8e10\u4e14\u4e3a\u6574\u6570\u7684\u952e&quot;&quot;&quot;\n    return [k for k, v in data.items() if v &gt; 10 and isinstance(v, int)]<\/code><\/pre><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. Python \u5b98\u65b9\u6700\u4f73\u5b9e\u8df5 (PEP 8)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Python \u4e4b\u7985 (PEP 8) \u5bf9 lambda \u6709\u660e\u786e\u7684\u5efa\u8bae\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u59cb\u7ec8\u4f7f\u7528 <code>def<\/code> \u8bed\u53e5\u800c\u4e0d\u662f\u5c06 lambda \u8868\u8fbe\u5f0f\u76f4\u63a5\u7ed1\u5b9a\u5230\u6807\u8bc6\u7b26\u4e0a\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n<div class=\"chp-code-block chp-theme-github-dark chp-wrap-on\" data-chp-language=\"plaintext\" data-chp-line-start=\"1\" data-chp-highlight=\"\"><div class=\"chp-toolbar\"><div class=\"chp-toolbar-left\"><span class=\"chp-dots\"><span><\/span><span><\/span><span><\/span><\/span><span class=\"chp-language-label\">\u7eaf\u6587\u672c<\/span><\/div><div class=\"chp-toolbar-right\"><button type=\"button\" class=\"chp-copy-btn\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><svg class=\"chp-icon-copy\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z\"\/><\/svg><svg class=\"chp-icon-check\" viewBox=\"0 0 24 24\" width=\"14\" height=\"14\" aria-hidden=\"true\" style=\"display:none;\"><path fill=\"currentColor\" d=\"M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z\"\/><\/svg><span class=\"chp-copy-text\">\u590d\u5236<\/span><\/button><\/div><\/div><div class=\"chp-code-wrapper\"><div class=\"chp-line-numbers\" aria-hidden=\"true\"><span>1<\/span><span>2<\/span><span>3<\/span><span>4<\/span><span>5<\/span><span>6<\/span><\/div><pre class=\"chp-pre\" style=\"font-size:14px;\"><code class=\"language-plaintext\"># \u274c \u4e0d\u63a8\u8350 (PEP 8 \u53cd\u5bf9)\nf = lambda x: 2 * x\n\n# \u2705 \u63a8\u8350\ndef f(x):\n    return 2 * x<\/code><\/pre><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e3a\u4ec0\u4e48\uff1f<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>def<\/code> \u751f\u6210\u7684\u51fd\u6570\u5728 traceback (\u9519\u8bef\u5806\u6808) \u4e2d\u4f1a\u663e\u793a\u771f\u5b9e\u7684\u51fd\u6570\u540d\uff08\u5982 <code>f<\/code>\uff09\uff0c\u800c lambda \u53ea\u4f1a\u663e\u793a <code>&lt;lambda><\/code>\uff0c\u4e0d\u5229\u4e8e\u8c03\u8bd5\u3002<\/li>\n\n\n\n<li><code>def<\/code> \u652f\u6301\u7c7b\u578b\u63d0\u793a (Type Hints) \u548c\u591a\u884c Docstring\uff0c\u66f4\u5229\u4e8e\u5927\u578b\u9879\u76ee\u7ef4\u62a4\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u603b\u7ed3<\/strong>\uff1aLambda \u6700\u9002\u5408<strong>\u4e00\u6b21\u6027\u3001\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7684\u7b80\u5355\u64cd\u4f5c<\/strong>\uff08\u5982\u6392\u5e8f\u7684 key\u3001\u7b80\u5355\u7684 map\/filter\uff09\u3002\u4e00\u65e6\u9700\u8981\u590d\u7528\u3001\u547d\u540d\u6216\u903b\u8f91\u53d8\u590d\u6742\uff0c\u8bf7\u6beb\u4e0d\u72b9\u8c6b\u5730\u5207\u6362\u56de <code>def<\/code>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f60\u5bf9 lambda \u7684\u54ea\u4e2a\u5e94\u7528\u573a\u666f\u6700\u611f\u5174\u8da3\uff1f\u6216\u8005\u4f60\u6709\u67d0\u6bb5\u5177\u4f53\u7684\u4ee3\u7801\u60f3\u7528 lambda \u4f18\u5316\u5417\uff1f\u53ef\u4ee5\u53d1\u7ed9\u6211\u770b\u770b\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Python \u4e2d\uff0clambda \u662f\u4e00\u79cd\u521b\u5efa\u5c0f\u578b&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-74","post","type-post","status-publish","format-standard","hentry","category-python-3-"],"_links":{"self":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/74","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/comments?post=74"}],"version-history":[{"count":1,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/74\/revisions"}],"predecessor-version":[{"id":75,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/74\/revisions\/75"}],"wp:attachment":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/media?parent=74"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/categories?post=74"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/tags?post=74"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}