{"id":72901,"date":"2026-02-06T18:49:32","date_gmt":"2026-02-06T10:49:32","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/72901.html"},"modified":"2026-02-06T18:49:32","modified_gmt":"2026-02-06T10:49:32","slug":"%e5%af%b9python%e7%9a%84%e5%86%8d%e8%ae%a4%e8%af%86-%e5%9f%ba%e4%ba%8e%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84%e8%bf%9b%e8%a1%8c-a002-%e5%88%97%e8%a1%a8-%e5%88%97%e8%a1%a8%e6%8e%a8%e5%af%bc%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/72901.html","title":{"rendered":"\u5bf9python\u7684\u518d\u8ba4\u8bc6-\u57fa\u4e8e\u6570\u636e\u7ed3\u6784\u8fdb\u884c-a002-\u5217\u8868-\u5217\u8868\u63a8\u5bfc\u5f0f"},"content":{"rendered":"<h2>Python \u5217\u8868\u63a8\u5bfc\u5f0f-\u4e0elist()\u62d3\u5c55<\/h2>\n<p>\u672c\u6587\u805a\u7126 Python \u5217\u8868\u63a8\u5bfc\u5f0f&#xff08;List Comprehension&#xff09;\u7684\u5b8c\u6574\u7528\u6cd5&#xff0c;\u5305\u542b\u57fa\u7840\u8bed\u6cd5\u3001\u9ad8\u7ea7\u6280\u5de7\u3001\u4e0e list() \u7684\u5bf9\u6bd4\u53ca\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n<p>\u6211\u4e5f\u5c06\u7ed9\u51fa\u4e2a\u4eba\u601d\u7ef4\u5bfc\u56fe<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260206104930-6985c73aeec64.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<h3>\u4e00\u3001\u57fa\u7840\u8bed\u6cd5<\/h3>\n<h4>1.1 \u57fa\u672c\u5f62\u5f0f<\/h4>\n<p>\u5217\u8868\u63a8\u5bfc\u5f0f\u7528\u4e00\u884c\u4ee3\u7801\u66ff\u4ee3\u4f20\u7edf\u7684 for \u5faa\u73af&#xff0c;\u8bed\u6cd5\u7ed3\u6784\u4e3a&#xff1a;<\/p>\n<p><span class=\"token punctuation\">[<\/span>\u8868\u8fbe\u5f0f <span class=\"token keyword\">for<\/span> \u53d8\u91cf <span class=\"token keyword\">in<\/span> \u53ef\u8fed\u4ee3\u5bf9\u8c61<span class=\"token punctuation\">]<\/span><\/p>\n<p>\u793a\u4f8b\u5bf9\u6bd4&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u4f20\u7edf\u5199\u6cd5<\/span><br \/>\nsquares <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    squares<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u5217\u8868\u63a8\u5bfc\u5f0f<\/span><br \/>\nsquares <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [0, 1, 4, 9, 16]<\/span><\/p>\n<h4>1.2 \u5e26\u6761\u4ef6\u7684\u63a8\u5bfc\u5f0f<\/h4>\n<p>\u6dfb\u52a0 if \u5b50\u53e5\u8fdb\u884c\u8fc7\u6ee4&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u53ea\u4fdd\u7559\u5076\u6570<\/span><br \/>\nevens <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [0, 2, 4, 6, 8]<\/span><\/p>\n<p><span class=\"token comment\"># \u8fc7\u6ee4\u5b57\u7b26\u4e32<\/span><br \/>\nwords <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;hello&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;world&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;python&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;hi&#039;<\/span><span class=\"token punctuation\">]<\/span><br \/>\nlong_words <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>w <span class=\"token keyword\">for<\/span> w <span class=\"token keyword\">in<\/span> words <span class=\"token keyword\">if<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [&#039;hello&#039;, &#039;world&#039;, &#039;python&#039;]<\/span><\/p>\n<p><span class=\"token comment\"># \u591a\u6761\u4ef6\u8fc7\u6ee4<\/span><br \/>\nnums <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">]<\/span><br \/>\nresult <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> nums <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">2<\/span> <span class=\"token keyword\">and<\/span> x <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [3, 4, 5]<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u6761\u4ef6 if \u653e\u5728 for \u4e4b\u540e&#xff0c;\u53ea\u7528\u4e8e\u8fc7\u6ee4&#xff0c;\u4e0d\u7528\u4e8e\u5206\u652f\u9009\u62e9\u3002<\/p>\n<h4>1.3 \u5e26\u5206\u652f\u7684\u63a8\u5bfc\u5f0f<\/h4>\n<p>\u4f7f\u7528 if-else \u4e09\u5143\u8868\u8fbe\u5f0f\u8fdb\u884c\u5206\u652f\u9009\u62e9&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u6839\u636e\u6761\u4ef6\u8fd4\u56de\u4e0d\u540c\u503c<\/span><br \/>\nresult <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;\u5076\u6570&#039;<\/span> <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token string\">&#039;\u5947\u6570&#039;<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [&#039;\u5076\u6570&#039;, &#039;\u5947\u6570&#039;, &#039;\u5076\u6570&#039;, &#039;\u5947\u6570&#039;, &#039;\u5076\u6570&#039;]<\/span><\/p>\n<p><span class=\"token comment\"># \u6570\u503c\u8f6c\u6362<\/span><br \/>\nnums <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><br \/>\nabs_nums <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token operator\">&#8211;<\/span>x <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> nums<span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [1, 2, 3, 4, 5]<\/span><\/p>\n<p><span class=\"token comment\"># \u590d\u6742\u5206\u652f<\/span><br \/>\nscores <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">85<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">92<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">78<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">65<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">95<\/span><span class=\"token punctuation\">]<\/span><br \/>\ngrades <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;A&#039;<\/span> <span class=\"token keyword\">if<\/span> s <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">90<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token string\">&#039;B&#039;<\/span> <span class=\"token keyword\">if<\/span> s <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">80<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token string\">&#039;C&#039;<\/span> <span class=\"token keyword\">for<\/span> s <span class=\"token keyword\">in<\/span> scores<span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [&#039;B&#039;, &#039;A&#039;, &#039;C&#039;, &#039;C&#039;, &#039;A&#039;]<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;if-else \u653e\u5728 for \u4e4b\u524d&#xff0c;\u7528\u4e8e\u8868\u8fbe\u5f0f\u7684\u5206\u652f\u9009\u62e9\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u9ad8\u7ea7\u7528\u6cd5<\/h3>\n<h4>2.1 \u53cc\u91cd\u5faa\u73af<\/h4>\n<p>\u5904\u7406\u5d4c\u5957\u53ef\u8fed\u4ee3\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u751f\u6210\u6240\u6709\u5750\u6807\u7ec4\u5408<\/span><br \/>\ncoords <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> y <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [(0, 0), (0, 1), (1, 0), (1, 1), (2, 0), (2, 1)]<\/span><\/p>\n<p><span class=\"token comment\"># \u7b49\u4ef7\u4e8e&#xff1a;<\/span><br \/>\ncoords <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> y <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        coords<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u53cc\u91cd\u5faa\u73af\u5e26\u6761\u4ef6<\/span><br \/>\npairs <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> y <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">!&#061;<\/span> y<span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [(0, 1), (0, 2), (1, 0), (1, 2), (2, 0), (2, 1)]<\/span><\/p>\n<h4>2.2 \u5d4c\u5957\u5217\u8868\u6241\u5e73\u5316<\/h4>\n<p>\u5c06\u4e8c\u7ef4\u5217\u8868\u5c55\u5f00\u4e3a\u4e00\u7ef4&#xff1a;<\/p>\n<p>matrix <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token comment\"># \u6241\u5e73\u5316<\/span><br \/>\nflat <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>num <span class=\"token keyword\">for<\/span> row <span class=\"token keyword\">in<\/span> matrix <span class=\"token keyword\">for<\/span> num <span class=\"token keyword\">in<\/span> row<span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [1, 2, 3, 4, 5, 6, 7, 8, 9]<\/span><\/p>\n<p><span class=\"token comment\"># \u7b49\u4ef7\u4e8e&#xff1a;<\/span><br \/>\nflat <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token keyword\">for<\/span> row <span class=\"token keyword\">in<\/span> matrix<span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> num <span class=\"token keyword\">in<\/span> row<span class=\"token punctuation\">:<\/span><br \/>\n        flat<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>num<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u5e26\u6761\u4ef6\u8fc7\u6ee4<\/span><br \/>\neven_flat <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>num <span class=\"token keyword\">for<\/span> row <span class=\"token keyword\">in<\/span> matrix <span class=\"token keyword\">for<\/span> num <span class=\"token keyword\">in<\/span> row <span class=\"token keyword\">if<\/span> num <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [2, 4, 6, 8]<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u5faa\u73af\u987a\u5e8f\u4e0e\u4e66\u5199\u987a\u5e8f\u4e00\u81f4&#xff0c;\u5916\u5c42\u5faa\u73af\u5728\u524d&#xff0c;\u5185\u5c42\u5faa\u73af\u5728\u540e\u3002<\/p>\n<h4>2.3 \u7ed3\u5408\u51fd\u6570\u8c03\u7528<\/h4>\n<p>\u5728\u8868\u8fbe\u5f0f\u4e2d\u8c03\u7528\u51fd\u6570&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u5b57\u7b26\u4e32\u5904\u7406<\/span><br \/>\nnames <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;alice&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;bob&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;charlie&#039;<\/span><span class=\"token punctuation\">]<\/span><br \/>\ncapitalized <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>name<span class=\"token punctuation\">.<\/span>title<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> name <span class=\"token keyword\">in<\/span> names<span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [&#039;Alice&#039;, &#039;Bob&#039;, &#039;Charlie&#039;]<\/span><\/p>\n<p><span class=\"token comment\"># \u6570\u5b66\u8fd0\u7b97<\/span><br \/>\n<span class=\"token keyword\">import<\/span> math<br \/>\nrounded <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token builtin\">round<\/span><span class=\"token punctuation\">(<\/span>math<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [1.0, 1.41, 1.73, 2.0, 2.24]<\/span><\/p>\n<p><span class=\"token comment\"># \u81ea\u5b9a\u4e49\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">process<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> x <span class=\"token operator\">*<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>result <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>process<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [1, 3, 5, 7, 9]<\/span><\/p>\n<h4>2.4 \u4e0e enumerate\/range \u7ec4\u5408<\/h4>\n<p><span class=\"token comment\"># \u5e26\u7d22\u5f15\u7684\u63a8\u5bfc\u5f0f<\/span><br \/>\nwords <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;apple&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;banana&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;cherry&#039;<\/span><span class=\"token punctuation\">]<\/span><br \/>\nindexed <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string-interpolation\"><span class=\"token string\">f&#034;<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>i<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">: <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>w<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span> <span class=\"token keyword\">for<\/span> i<span class=\"token punctuation\">,<\/span> w <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">enumerate<\/span><span class=\"token punctuation\">(<\/span>words<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [&#039;0: apple&#039;, &#039;1: banana&#039;, &#039;2: cherry&#039;]<\/span><\/p>\n<p><span class=\"token comment\"># \u5e26\u7d22\u5f15\u7684\u6761\u4ef6<\/span><br \/>\nindexed_even <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>w <span class=\"token keyword\">for<\/span> i<span class=\"token punctuation\">,<\/span> w <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">enumerate<\/span><span class=\"token punctuation\">(<\/span>words<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">if<\/span> i <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [&#039;apple&#039;, &#039;cherry&#039;]<\/span><\/p>\n<p><span class=\"token comment\"># \u6b65\u957f\u8303\u56f4<\/span><br \/>\nevens <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [0, 2, 4, 6, 8]<\/span><\/p>\n<hr \/>\n<h3>\u4e09\u3001\u4e0e list() \u6784\u9020\u51fd\u6570\u5bf9\u6bd4<\/h3>\n<h4>3.1 list() \u57fa\u7840\u7528\u6cd5<\/h4>\n<p>list() \u662f\u5217\u8868\u7684\u6784\u9020\u51fd\u6570&#xff0c;\u7528\u4e8e\u521b\u5efa\u5217\u8868&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u521b\u5efa\u7a7a\u5217\u8868<\/span><br \/>\nempty <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\"># \u7b49\u540c\u4e8e: empty &#061; []<\/span><\/p>\n<p><span class=\"token comment\"># \u4ece\u53ef\u8fed\u4ee3\u5bf9\u8c61\u521b\u5efa<\/span><br \/>\nnums <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [0, 1, 2, 3, 4]<\/span><\/p>\n<p><span class=\"token comment\"># \u4ece\u5b57\u7b26\u4e32\u521b\u5efa<\/span><br \/>\nchars <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;hello&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [&#039;h&#039;, &#039;e&#039;, &#039;l&#039;, &#039;l&#039;, &#039;o&#039;]<\/span><\/p>\n<p><span class=\"token comment\"># \u4ece\u5143\u7ec4\u521b\u5efa<\/span><br \/>\ntup <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><br \/>\nlst <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>tup<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [1, 2, 3]<\/span><\/p>\n<h4>3.2 list() \u8f6c\u6362\u573a\u666f<\/h4>\n<p>list() \u4e3b\u8981\u7528\u4e8e\u7c7b\u578b\u8f6c\u6362&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u5b57\u5178\u8f6c\u5217\u8868&#xff08;\u53ea\u4fdd\u7559\u952e&#xff09;<\/span><br \/>\nd <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#039;a&#039;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;b&#039;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">}<\/span><br \/>\nkeys <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>d<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [&#039;a&#039;, &#039;b&#039;]<\/span><\/p>\n<p><span class=\"token comment\"># \u5b57\u5178 items() \u8f6c\u5217\u8868<\/span><br \/>\nitems <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>d<span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [(&#039;a&#039;, 1), (&#039;b&#039;, 2)]<\/span><\/p>\n<p><span class=\"token comment\"># \u96c6\u5408\u8f6c\u5217\u8868<\/span><br \/>\ns <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">}<\/span><br \/>\nlst <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [1, 2, 3]&#xff08;\u987a\u5e8f\u53ef\u80fd\u4e0d\u540c&#xff09;<\/span><\/p>\n<p><span class=\"token comment\"># \u8fed\u4ee3\u5668\u8f6c\u5217\u8868<\/span><br \/>\nit <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">iter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\nlst <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>it<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [1, 2, 3]<\/span><\/p>\n<h4>3.3 \u5217\u8868\u63a8\u5bfc\u5f0f vs list() &#043; map<\/h4>\n<p><span class=\"token comment\"># \u4f7f\u7528 list() &#043; map<\/span><br \/>\nnums <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><br \/>\nsquares <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">lambda<\/span> x<span class=\"token punctuation\">:<\/span> x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> nums<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [1, 4, 9, 16]<\/span><\/p>\n<p><span class=\"token comment\"># \u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f&#xff08;\u66f4\u6e05\u6670&#xff09;<\/span><br \/>\nsquares <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> nums<span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [1, 4, 9, 16]<\/span><\/p>\n<p><span class=\"token comment\"># \u5e26\u6761\u4ef6\u7684\u8fc7\u6ee4<\/span><br \/>\n<span class=\"token comment\"># map \u9700\u8981\u914d\u5408 filter<\/span><br \/>\nevens_squared <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">lambda<\/span> x<span class=\"token punctuation\">:<\/span> x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">lambda<\/span> x<span class=\"token punctuation\">:<\/span> x <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> nums<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u5217\u8868\u63a8\u5bfc\u5f0f&#xff08;\u66f4\u7b80\u6d01&#xff09;<\/span><br \/>\nevens_squared <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> nums <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<hr \/>\n<h3>\u56db\u3001\u6027\u80fd\u5bf9\u6bd4<\/h3>\n<h4>4.1 \u901f\u5ea6\u6d4b\u8bd5<\/h4>\n<p><span class=\"token keyword\">import<\/span> timeit<\/p>\n<p><span class=\"token comment\"># \u6d4b\u8bd5\u4ee3\u7801&#xff1a;\u751f\u6210 0-999999 \u7684\u5e73\u65b9<\/span><br \/>\nTEST_COMP <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;[x ** 2 for x in range(1000000)]&#034;<\/span><br \/>\nTEST_FOR <span class=\"token operator\">&#061;<\/span> <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;<br \/>\nresult &#061; []<br \/>\nfor x in range(1000000):<br \/>\n    result.append(x ** 2)<br \/>\n&#034;&#034;&#034;<\/span><br \/>\nTEST_MAP <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;list(map(lambda x: x ** 2, range(1000000)))&#034;<\/span><\/p>\n<table>\n<tr>\u65b9\u6cd5\u76f8\u5bf9\u901f\u5ea6\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u5217\u8868\u63a8\u5bfc\u5f0f<\/td>\n<td>1.0x<\/td>\n<td>\u57fa\u51c6&#xff0c;\u6700\u5feb<\/td>\n<\/tr>\n<tr>\n<td>map &#043; lambda<\/td>\n<td>1.3x<\/td>\n<td>\u7565\u6162&#xff0c;lambda \u6709\u5f00\u9500<\/td>\n<\/tr>\n<tr>\n<td>\u4f20\u7edf for \u5faa\u73af<\/td>\n<td>1.5x<\/td>\n<td>append \u8c03\u7528\u6709\u989d\u5916\u5f00\u9500<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>4.2 \u6027\u80fd\u4f18\u52bf\u539f\u56e0<\/h4>\n<ul>\n<li>\u5b57\u8282\u7801\u4f18\u5316&#xff1a;\u5217\u8868\u63a8\u5bfc\u5f0f\u4f7f\u7528\u4e13\u7528\u5b57\u8282\u7801\u6307\u4ee4 LIST_APPEND<\/li>\n<li>\u51cf\u5c11\u65b9\u6cd5\u67e5\u627e&#xff1a;\u907f\u514d append \u65b9\u6cd5\u6bcf\u6b21\u8c03\u7528\u65f6\u7684\u67e5\u627e<\/li>\n<li>C \u5c42\u6267\u884c&#xff1a;\u90e8\u5206\u5faa\u73af\u903b\u8f91\u5728 C \u5c42\u9ad8\u6548\u6267\u884c<\/li>\n<\/ul>\n<h4>4.3 \u5185\u5b58\u5bf9\u6bd4<\/h4>\n<p><span class=\"token comment\"># \u5217\u8868\u63a8\u5bfc\u5f0f &#8211; \u7acb\u5373\u521b\u5efa\u5b8c\u6574\u5217\u8868<\/span><br \/>\nlst <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># \u5360\u7528 ~8MB \u5185\u5b58<\/span><\/p>\n<p><span class=\"token comment\"># list() &#043; map &#8211; \u540c\u6837\u521b\u5efa\u5b8c\u6574\u5217\u8868<\/span><br \/>\nlst <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">lambda<\/span> x<span class=\"token punctuation\">:<\/span> x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u5360\u7528 ~8MB \u5185\u5b58<\/span><\/p>\n<p><span class=\"token comment\"># \u751f\u6210\u5668\u8868\u8fbe\u5f0f &#8211; \u60f0\u6027\u8ba1\u7b97&#xff08;\u6ce8\u610f\u662f\u5706\u62ec\u53f7&#xff09;<\/span><br \/>\ngen <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u51e0\u4e4e\u4e0d\u5360\u7528\u5185\u5b58<\/span><br \/>\n<span class=\"token builtin\">sum<\/span><span class=\"token punctuation\">(<\/span>gen<span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u9700\u8981\u65f6\u624d\u8ba1\u7b97<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u751f\u6210\u5668\u8868\u8fbe\u5f0f (x for x in &#8230;) \u4e0d\u662f\u5217\u8868\u63a8\u5bfc\u5f0f&#xff0c;\u5b83\u8fd4\u56de\u751f\u6210\u5668\u5bf9\u8c61\u800c\u975e\u5217\u8868\u3002<\/p>\n<hr \/>\n<h3>\u4e94\u3001\u6700\u4f73\u5b9e\u8df5<\/h3>\n<h4>5.1 \u4f55\u65f6\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f<\/h4>\n<p>\u63a8\u8350\u573a\u666f&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u7b80\u5355\u8f6c\u6362<\/span><br \/>\ndoubled <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token operator\">*<\/span> <span class=\"token number\">2<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token comment\"># \u7b80\u5355\u8fc7\u6ee4<\/span><br \/>\npositives <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> nums <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token comment\"># \u7ec4\u5408\u64cd\u4f5c<\/span><br \/>\nresult <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x<span class=\"token punctuation\">.<\/span>title<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> names <span class=\"token keyword\">if<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token comment\"># \u63d0\u53d6\u5c5e\u6027<\/span><br \/>\nages <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>person<span class=\"token punctuation\">.<\/span>age <span class=\"token keyword\">for<\/span> person <span class=\"token keyword\">in<\/span> people<span class=\"token punctuation\">]<\/span><\/p>\n<h4>5.2 \u4f55\u65f6\u4e0d\u4f7f\u7528<\/h4>\n<p>\u4e0d\u63a8\u8350\u573a\u666f&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u8fc7\u4e8e\u590d\u6742 &#8211; \u53ef\u8bfb\u6027\u5dee<\/span><br \/>\n<span class=\"token comment\"># \u4e0d\u63a8\u8350<\/span><br \/>\nbad <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">,<\/span> x<span class=\"token operator\">*<\/span>y<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> y <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">!&#061;<\/span> y <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">*<\/span> y <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token comment\"># \u63a8\u8350 &#8211; \u4f7f\u7528\u4f20\u7edf\u5faa\u73af<\/span><br \/>\ngood <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> y <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">!&#061;<\/span> y <span class=\"token keyword\">and<\/span> x <span class=\"token operator\">*<\/span> y <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            good<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">,<\/span> x <span class=\"token operator\">*<\/span> y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u591a\u91cd\u5d4c\u5957\u5206\u652f<\/span><br \/>\n<span class=\"token comment\"># \u4e0d\u63a8\u8350<\/span><br \/>\nbad <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span> <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">else<\/span> x <span class=\"token operator\">**<\/span> <span class=\"token number\">3<\/span> <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">5<\/span> <span class=\"token keyword\">else<\/span> x <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token comment\"># \u63a8\u8350<\/span><br \/>\ngood <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        good<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>x <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">elif<\/span> x <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        good<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>x <span class=\"token operator\">**<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        good<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><\/p>\n<h4>5.3 \u4ee3\u7801\u98ce\u683c\u5efa\u8bae<\/h4>\n<table>\n<tr>\u539f\u5219\u597d\u7684\u793a\u4f8b\u4e0d\u597d\u7684\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td>\u4fdd\u6301\u7b80\u77ed<\/td>\n<td>[x*2 for x in nums]<\/td>\n<td>[very_long_expression for x in nums]<\/td>\n<\/tr>\n<tr>\n<td>\u907f\u514d\u5d4c\u5957\u8fc7\u6df1<\/td>\n<td>\u5355\u5c42\u6216\u53cc\u5c42\u5faa\u73af<\/td>\n<td>\u4e09\u5c42\u53ca\u4ee5\u4e0a\u5faa\u73af<\/td>\n<\/tr>\n<tr>\n<td>\u6709\u610f\u4e49\u7684\u53d8\u91cf\u540d<\/td>\n<td>[s.title() for s in names]<\/td>\n<td>[i for i in j]<\/td>\n<\/tr>\n<tr>\n<td>\u4f18\u5148\u53ef\u8bfb\u6027<\/td>\n<td>\u590d\u6742\u903b\u8f91\u7528\u4f20\u7edf\u5faa\u73af<\/td>\n<td>\u5f3a\u884c\u7528\u63a8\u5bfc\u5f0f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u516d\u3001\u5e38\u89c1\u9677\u9631<\/h3>\n<h4>6.1 \u526f\u4f5c\u7528<\/h4>\n<p><span class=\"token comment\"># \u4e0d\u63a8\u8350&#xff1a;\u63a8\u5bfc\u5f0f\u53ea\u7528\u4e8e\u521b\u5efa\u5217\u8868&#xff0c;\u4e0d\u5e94\u6709\u526f\u4f5c\u7528<\/span><br \/>\nresults <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token comment\"># \u7ed3\u679c: [None, None, None, None, None] &#8211; \u6253\u5370\u4e86 5 \u6b21<\/span><\/p>\n<p><span class=\"token comment\"># \u63a8\u8350&#xff1a;\u5206\u79bb\u903b\u8f91<\/span><br \/>\n<span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span><br \/>\nresults <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>x <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<h4>6.2 \u53ef\u53d8\u5bf9\u8c61\u5f15\u7528<\/h4>\n<p><span class=\"token comment\"># \u9519\u8bef&#xff1a;\u521b\u5efa\u591a\u4e2a\u5f15\u7528\u540c\u4e00\u5217\u8868<\/span><br \/>\nmatrix <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">3<\/span><br \/>\nmatrix<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5<\/span><br \/>\n<span class=\"token comment\"># matrix: [[0, 5, 0], [0, 5, 0], [0, 5, 0]] &#8211; \u6240\u6709\u884c\u90fd\u88ab\u4fee\u6539<\/span><\/p>\n<p><span class=\"token comment\"># \u6b63\u786e&#xff1a;\u6bcf\u884c\u662f\u72ec\u7acb\u5217\u8868<\/span><br \/>\nmatrix <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">3<\/span> <span class=\"token keyword\">for<\/span> _ <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\nmatrix<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5<\/span><br \/>\n<span class=\"token comment\"># matrix: [[0, 5, 0], [0, 0, 0], [0, 0, 0]] &#8211; \u53ea\u4fee\u6539\u7b2c\u4e00\u884c<\/span><\/p>\n<h4>6.3 \u6df7\u6dc6 if \u4f4d\u7f6e<\/h4>\n<p><span class=\"token comment\"># if \u5728 for \u4e4b\u540e&#xff1a;\u8fc7\u6ee4<\/span><br \/>\n<span class=\"token punctuation\">[<\/span>x <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># [0, 2, 4, 6, 8]<\/span><\/p>\n<p><span class=\"token comment\"># if-else \u5728 for \u4e4b\u524d&#xff1a;\u5206\u652f<\/span><br \/>\n<span class=\"token punctuation\">[<\/span>x <span class=\"token keyword\">if<\/span> x <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># [0, -1, 2, -1, 4]<\/span><\/p>\n<p><span class=\"token comment\"># \u5e38\u89c1\u9519\u8bef&#xff1a;\u628a\u8fc7\u6ee4 if \u653e\u5728\u524d\u9762<\/span><br \/>\n<span class=\"token comment\"># [x if x % 2 &#061;&#061; 0 for x in range(10)]  # SyntaxError<\/span><\/p>\n<hr \/>\n<h3>\u4e03\u3001\u603b\u7ed3<\/h3>\n<table>\n<tr>\u65b9\u9762\u8981\u70b9<\/tr>\n<tbody>\n<tr>\n<td>\u6838\u5fc3\u8bed\u6cd5<\/td>\n<td>[\u8868\u8fbe\u5f0f for \u53d8\u91cf in \u53ef\u8fed\u4ee3\u5bf9\u8c61 if \u6761\u4ef6]<\/td>\n<\/tr>\n<tr>\n<td>if \u4f4d\u7f6e<\/td>\n<td>\u8fc7\u6ee4\u7528 for &#8230; if&#xff0c;\u5206\u652f\u7528 &#8230; if &#8230; else &#8230; for<\/td>\n<\/tr>\n<tr>\n<td>\u4f18\u52bf<\/td>\n<td>\u7b80\u6d01\u3001\u5feb\u901f\u3001\u53ef\u8bfb\u6027\u5f3a<\/td>\n<\/tr>\n<tr>\n<td>\u5c40\u9650<\/td>\n<td>\u590d\u6742\u903b\u8f91\u964d\u4f4e\u53ef\u8bfb\u6027<\/td>\n<\/tr>\n<tr>\n<td>\u6700\u4f73\u5b9e\u8df5<\/td>\n<td>\u7b80\u5355\u64cd\u4f5c\u7528\u63a8\u5bfc\u5f0f&#xff0c;\u590d\u6742\u903b\u8f91\u7528\u5faa\u73af<\/td>\n<\/tr>\n<tr>\n<td>vs list()<\/td>\n<td>list() \u7528\u4e8e\u7c7b\u578b\u8f6c\u6362&#xff0c;\u63a8\u5bfc\u5f0f\u7528\u4e8e\u751f\u6210\u65b0\u5217\u8868<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Python \u5217\u8868\u63a8\u5bfc\u5f0f-\u4e0elist()\u62d3\u5c55<br \/>\n\u672c\u6587\u805a\u7126 Python \u5217\u8868\u63a8\u5bfc\u5f0f&#xff08;List Comprehension&#xff09;\u7684\u5b8c\u6574\u7528\u6cd5&#xff0c;\u5305\u542b\u57fa\u7840\u8bed\u6cd5\u3001\u9ad8\u7ea7\u6280\u5de7\u3001\u4e0e list() \u7684\u5bf9\u6bd4\u53ca\u6700\u4f73\u5b9e\u8df5\u3002<br \/>\n\u6211\u4e5f\u5c06\u7ed9\u51fa\u4e2a\u4eba\u601d\u7ef4\u5bfc\u56fe\u4e00\u3001\u57fa\u7840\u8bed\u6cd5<br \/>\n1.1 \u57fa\u672c\u5f62\u5f0f<br \/>\n\u5217\u8868\u63a8\u5bfc\u5f0f\u7528\u4e00\u884c\u4ee3\u7801\u66ff\u4ee3\u4f20\u7edf\u7684 for \u5faa\u73af&#xff0c;\u8bed\u6cd5\u7ed3\u6784\u4e3a&#xff1a;<br \/>\n[\u8868\u8fbe\u5f0f for \u53d8\u91cf in \u53ef\u8fed\u4ee3\u5bf9\u8c61]\u793a\u4f8b\u5bf9\u6bd4&#xff1a;<br \/>\n# \u4f20\u7edf\u5199\u6cd5<br \/>\nsquares  [<\/p>\n","protected":false},"author":2,"featured_media":72900,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[81,190,1813],"topic":[],"class_list":["post-72901","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-python","tag-190","tag-1813"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5bf9python\u7684\u518d\u8ba4\u8bc6-\u57fa\u4e8e\u6570\u636e\u7ed3\u6784\u8fdb\u884c-a002-\u5217\u8868-\u5217\u8868\u63a8\u5bfc\u5f0f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/72901.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" 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