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\u672c\u9879\u76ee\u4ee5Python\u4e3a\u6838\u5fc3\u5f00\u53d1\u8bed\u8a00&#xff0c;\u540e\u7aef\u57fa\u4e8eDjango\u6846\u67b6\u642d\u914ddjango-rest-framework\u642d\u5efaMVC\u67b6\u6784&#xff0c;\u524d\u7aef\u91c7\u7528bootstrap3\u3001js\u3001jquery\u5b9e\u73b0\u9875\u9762\u4ea4\u4e92&#xff1b;\u6570\u636e\u5e93\u652f\u6301SQLite3\/MySQL&#xff0c;\u7ed3\u5408requests\u722c\u866b\u6293\u53d6\u8c46\u74e3\u7535\u5f71\u6570\u636e&#xff0c;\u6838\u5fc3\u8fd0\u7528\u534f\u540c\u8fc7\u6ee4\u63a8\u8350\u7b97\u6cd5\u5b9e\u73b0\u7535\u5f71\u667a\u80fd\u63a8\u8350&#xff0c;\u6574\u4f53\u6784\u5efa\u8d77\u529f\u80fd\u5b8c\u6574\u7684\u7535\u5f71\u63a8\u8350\u7cfb\u7edf\u3002<\/p>\n<p>\u4e8c\u3001\u529f\u80fd\u6a21\u5757<\/p>\n<ul>\n<li>\u6570\u636e\u91c7\u96c6&#xff1a;\u901a\u8fc7Python\u811a\u672c\u914d\u7f6e\u8bf7\u6c42\u5934\u4e0e\u76ee\u6807URL&#xff0c;\u8bbe\u5b9a\u591a\u9875\u94fe\u63a5\u8303\u56f4\u542f\u52a8\u722c\u866b&#xff0c;\u6293\u53d6\u8c46\u74e3\u7535\u5f71\u7684\u540d\u79f0\u3001\u6d77\u62a5\u3001\u5bfc\u6f14\u3001\u4e0a\u6620\u4fe1\u606f\u7b493000\u6761\u6570\u636e&#xff0c;\u6293\u53d6\u8fc7\u7a0b\u5b9e\u65f6\u5c55\u793a\u72b6\u6001\u5e76\u540c\u6b65\u8bb0\u5f55\u6570\u636e&#xff0c;\u4e3a\u7cfb\u7edf\u63d0\u4f9b\u5145\u8db3\u7684\u6570\u636e\u6e90\u652f\u6491\u3002<\/li>\n<li>\u7535\u5f71\u4fe1\u606f\u5c55\u793a\u4e0e\u7ba1\u7406&#xff1a;\u524d\u53f0\u652f\u6301\u6309\u6807\u7b7e\u7b5b\u9009\u3001\u70ed\u5ea6\/\u65f6\u95f4\/\u8bc4\u5206\u6392\u5e8f\u5c55\u793a\u7535\u5f71\u5217\u8868&#xff0c;\u8be6\u60c5\u9875\u5448\u73b0\u7535\u5f71\u6d77\u62a5\u3001\u5267\u60c5\u4ecb\u7ecd\u7b49\u5b8c\u6574\u4fe1\u606f&#xff1b;\u540e\u53f0\u53ef\u901a\u8fc7\u540d\u79f0\u3001\u5bfc\u6f14\u7b49\u6761\u4ef6\u641c\u7d22\u7535\u5f71&#xff0c;\u6267\u884c\u589e\u5220\u64cd\u4f5c&#xff0c;\u7edf\u4e00\u7ba1\u63a7\u7535\u5f71\u57fa\u7840\u6570\u636e\u3002<\/li>\n<li>\u7528\u6237\u4ea4\u4e92&#xff08;\u767b\u5f55\u3001\u6ce8\u518c\u3001\u8bc4\u5206\u3001\u6536\u85cf\u7b49&#xff09;&#xff1a;\u63d0\u4f9b\u7528\u6237\u6ce8\u518c\u3001\u767b\u5f55\u53ca\u4fe1\u606f\u4fee\u6539\u529f\u80fd&#xff0c;\u7528\u6237\u53ef\u5bf9\u7535\u5f71\u8fdb\u884c\u8bc4\u5206\u3001\u6536\u85cf\u3001\u8bc4\u8bba&#xff0c;\u6536\u85cf\u9875\u9762\u53ef\u67e5\u770b\u5df2\u6536\u85cf\u5f71\u7247\u5217\u8868&#xff0c;\u6ee1\u8db3\u7528\u6237\u4e2a\u6027\u5316\u7684\u89c2\u5f71\u4ea4\u4e92\u9700\u6c42\u3002<\/li>\n<li>\u7535\u5f71\u63a8\u8350&#xff1a;\u57fa\u4e8e\u7528\u6237\u548c\u7269\u54c1\u7684\u534f\u540c\u8fc7\u6ee4\u7b97\u6cd5\u5b9e\u73b0\u63a8\u8350&#xff0c;\u9488\u5bf9\u51b7\u542f\u52a8\u95ee\u9898\u4f18\u5316\u903b\u8f91&#xff0c;\u4ee5\u201c\u76f8\u4f3c\u5ea6*\u8bc4\u5206\u201d\u8ba1\u7b97\u63a8\u8350\u503c&#xff0c;\u6839\u636e\u7528\u6237\u70b9\u8d5e\u3001\u6536\u85cf\u7b49\u884c\u4e3a\u63a8\u8350\u611f\u5174\u8da3\u7684\u7535\u5f71&#xff0c;\u63a8\u8350\u51c6\u786e\u7387\u7ea675%&#xff0c;\u8fd8\u652f\u6301\u201c\u6362\u4e00\u6279\u201d\u5237\u65b0\u63a8\u8350\u5185\u5bb9\u3002<\/li>\n<li>\u540e\u53f0\u6570\u636e\u7ba1\u7406&#xff1a;\u63d0\u4f9b\u5feb\u6377\u64cd\u4f5c\u5165\u53e3&#xff0c;\u53ef\u7ba1\u7406\u7528\u6237\u504f\u597d\u3001\u524d\u53f0\u7528\u6237\u3001\u7535\u5f71\u6807\u7b7e\u3001\u8bc4\u5206\u4fe1\u606f\u7b49\u5185\u5bb9&#xff0c;\u5904\u7406\u6743\u9650\u4e0e\u7528\u6237\u7ec4\u8bbe\u7f6e&#xff0c;\u5c55\u793a\u6700\u8fd1\u64cd\u4f5c\u8bb0\u5f55&#xff0c;\u5b9e\u73b0\u7cfb\u7edf\u6570\u636e\u7684\u5168\u7ef4\u5ea6\u7ba1\u63a7\u3002<\/li>\n<\/ul>\n<p>\u4e09\u3001\u9879\u76ee\u603b\u7ed3 \u672c\u7535\u5f71\u63a8\u8350\u7cfb\u7edf\u91c7\u7528\u5206\u5c42\u6a21\u578b\u8bbe\u8ba1&#xff0c;\u4ece\u6570\u636e\u91c7\u96c6\u5230\u667a\u80fd\u63a8\u8350\u5f62\u6210\u5b8c\u6574\u95ed\u73af\u3002\u524d\u7aef\u4fa7\u91cd\u7528\u6237\u4f53\u9a8c&#xff0c;\u5b9e\u73b0\u7535\u5f71\u591a\u7ef4\u5ea6\u5c55\u793a\u4e0e\u4ea4\u4e92\u64cd\u4f5c&#xff1b;\u540e\u7aef\u4f9d\u6258Django\u6846\u67b6\u4fdd\u969c\u7cfb\u7edf\u7a33\u5b9a\u6027&#xff0c;\u7ed3\u5408\u534f\u540c\u8fc7\u6ee4\u7b97\u6cd5\u89e3\u51b3\u667a\u80fd\u63a8\u8350\u6838\u5fc3\u9700\u6c42&#xff0c;\u8fd8\u9488\u5bf9\u51b7\u542f\u52a8\u95ee\u9898\u4f18\u5316\u63a8\u8350\u903b\u8f91\u3002\u7cfb\u7edf\u4e0d\u4ec5\u80fd\u6293\u53d6\u5e76\u7ba1\u7406\u6d77\u91cf\u8c46\u74e3\u7535\u5f71\u6570\u636e&#xff0c;\u8fd8\u80fd\u57fa\u4e8e\u7528\u6237\u884c\u4e3a\u7cbe\u51c6\u63a8\u8350\u5f71\u7247&#xff0c;\u63a8\u8350\u51c6\u786e\u7387\u8fbe75%&#xff0c;\u540c\u65f6\u901a\u8fc7\u540e\u53f0\u5b9e\u73b0\u6570\u636e\u5168\u751f\u547d\u5468\u671f\u7ba1\u63a7&#xff0c;\u6574\u4f53\u529f\u80fd\u8986\u76d6\u7528\u6237\u4e0e\u7ba1\u7406\u5458\u7684\u6838\u5fc3\u9700\u6c42&#xff0c;\u5b8c\u6210\u4e86\u9884\u671f\u7684\u7535\u5f71\u63a8\u8350\u4e0e\u7ba1\u7406\u76ee\u6807\u3002<\/p>\n<h3>4\u3001\u6838\u5fc3\u4ee3\u7801<\/h3>\n<p><span class=\"token comment\"># -*-coding:utf-8-*-<\/span><br \/>\n<span class=\"token keyword\">import<\/span> os<\/p>\n<p>os<span class=\"token punctuation\">.<\/span>environ<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;DJANGO_SETTINGS_MODULE&#034;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;movie.settings&#034;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> django<\/p>\n<p>django<span class=\"token punctuation\">.<\/span>setup<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">from<\/span> movie<span class=\"token punctuation\">.<\/span>models <span class=\"token keyword\">import<\/span> <span class=\"token operator\">*<\/span><br \/>\n<span class=\"token keyword\">from<\/span> math <span class=\"token keyword\">import<\/span> sqrt<span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">pow<\/span><br \/>\n<span class=\"token keyword\">import<\/span> operator<br \/>\n<span class=\"token keyword\">from<\/span> django<span class=\"token punctuation\">.<\/span>db<span class=\"token punctuation\">.<\/span>models <span class=\"token keyword\">import<\/span> Subquery<span class=\"token punctuation\">,<\/span>Q<span class=\"token punctuation\">,<\/span>Count<\/p>\n<p><span class=\"token comment\"># from django.shortcuts import render,render_to_response<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserCf<\/span><span class=\"token punctuation\">:<\/span><\/p>\n<p>    <span class=\"token comment\"># \u83b7\u5f97\u521d\u59cb\u5316\u6570\u636e<\/span><br \/>\n    <span class=\"token keyword\">def<\/span> <span class=\"token function\">__init__<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">,<\/span> all_user<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        self<span class=\"token punctuation\">.<\/span>all_user <span class=\"token operator\">&#061;<\/span> all_user<\/p>\n<p>    <span class=\"token comment\"># \u901a\u8fc7\u7528\u6237\u540d\u83b7\u5f97\u5217\u8868&#xff0c;\u4ec5\u8c03\u8bd5\u4f7f\u7528<\/span><br \/>\n    <span class=\"token keyword\">def<\/span> <span class=\"token function\">getItems<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">,<\/span> username1<span class=\"token punctuation\">,<\/span> username2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> self<span class=\"token punctuation\">.<\/span>all_user<span class=\"token punctuation\">[<\/span>username1<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> self<span class=\"token punctuation\">.<\/span>all_user<span class=\"token punctuation\">[<\/span>username2<span class=\"token punctuation\">]<\/span><\/p>\n<p>    <span class=\"token comment\"># \u8ba1\u7b97\u4e24\u4e2a\u7528\u6237\u7684\u76ae\u5c14\u900a\u76f8\u5173\u7cfb\u6570<\/span><br \/>\n    <span class=\"token keyword\">def<\/span> <span class=\"token function\">pearson<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">,<\/span> user1<span class=\"token punctuation\">,<\/span> user2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>  <span class=\"token comment\"># \u6570\u636e\u683c\u5f0f\u4e3a&#xff1a;\u7269\u54c1id&#xff0c;\u6d4f\u89c8<\/span><br \/>\n        sum_xy <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0.0<\/span>  <span class=\"token comment\"># user1,user2 \u6bcf\u9879\u6253\u5206\u7684\u7684\u7d2f\u52a0<\/span><br \/>\n        n <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span>  <span class=\"token comment\"># \u516c\u5171\u6d4f\u89c8\u6b21\u6570<\/span><br \/>\n        sum_x <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0.0<\/span>  <span class=\"token comment\"># user1 \u7684\u6253\u5206\u603b\u548c<\/span><br \/>\n        sum_y <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0.0<\/span>  <span class=\"token comment\"># user2 \u7684\u6253\u5206\u603b\u548c<\/span><br \/>\n        sumX2 <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0.0<\/span>  <span class=\"token comment\"># user1\u6bcf\u9879\u6253\u5206\u5e73\u65b9\u7684\u7d2f\u52a0<\/span><br \/>\n        sumY2 <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0.0<\/span>  <span class=\"token comment\"># user2\u6bcf\u9879\u6253\u5206\u5e73\u65b9\u7684\u7d2f\u52a0<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> movie1<span class=\"token punctuation\">,<\/span> score1 <span class=\"token keyword\">in<\/span> user1<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 keyword\">if<\/span> movie1 <span class=\"token keyword\">in<\/span> user2<span class=\"token punctuation\">.<\/span>keys<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>  <span class=\"token comment\"># \u8ba1\u7b97\u516c\u5171\u7684\u6d4f\u89c8\u6b21\u6570<\/span><br \/>\n                n <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><br \/>\n                sum_xy <span class=\"token operator\">&#043;&#061;<\/span> score1 <span class=\"token operator\">*<\/span> user2<span class=\"token punctuation\">[<\/span>movie1<span class=\"token punctuation\">]<\/span><br \/>\n                sum_x <span class=\"token operator\">&#043;&#061;<\/span> score1<br \/>\n                sum_y <span class=\"token operator\">&#043;&#061;<\/span> user2<span class=\"token punctuation\">[<\/span>movie1<span class=\"token punctuation\">]<\/span><br \/>\n                sumX2 <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token builtin\">pow<\/span><span class=\"token punctuation\">(<\/span>score1<span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                sumY2 <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token builtin\">pow<\/span><span class=\"token punctuation\">(<\/span>user2<span class=\"token punctuation\">[<\/span>movie1<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> n <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token comment\"># print(&#034;p\u6c0f\u8ddd\u79bb\u4e3a0&#034;)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><br \/>\n        molecule <span class=\"token operator\">&#061;<\/span> sum_xy <span class=\"token operator\">&#8211;<\/span> <span class=\"token punctuation\">(<\/span>sum_x <span class=\"token operator\">*<\/span> sum_y<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> n  <span class=\"token comment\"># \u5206\u5b50<\/span><br \/>\n        denominator <span class=\"token operator\">&#061;<\/span> sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>sumX2 <span class=\"token operator\">&#8211;<\/span> <span class=\"token builtin\">pow<\/span><span class=\"token punctuation\">(<\/span>sum_x<span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> n<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span>sumY2 <span class=\"token operator\">&#8211;<\/span> <span class=\"token builtin\">pow<\/span><span class=\"token punctuation\">(<\/span>sum_y<span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u5206\u6bcd<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> denominator <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><br \/>\n        r <span class=\"token operator\">&#061;<\/span> molecule <span class=\"token operator\">\/<\/span> denominator<br \/>\n        <span class=\"token keyword\">return<\/span> r<\/p>\n<p>    <span class=\"token comment\"># \u8ba1\u7b97\u4e0e\u5f53\u524d\u7528\u6237\u7684\u8ddd\u79bb&#xff0c;\u83b7\u5f97\u6700\u4e34\u8fd1\u7684\u7528\u6237<\/span><br \/>\n    <span class=\"token keyword\">def<\/span> <span class=\"token function\">nearest_user<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">,<\/span> current_user<span class=\"token punctuation\">,<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        distances <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\"># \u7528\u6237&#xff0c;\u76f8\u4f3c\u5ea6<\/span><br \/>\n        <span class=\"token comment\"># \u904d\u5386\u6574\u4e2a\u6570\u636e\u96c6<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> user<span class=\"token punctuation\">,<\/span> rate_set <span class=\"token keyword\">in<\/span> self<span class=\"token punctuation\">.<\/span>all_user<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\"># \u975e\u5f53\u524d\u7684\u7528\u6237<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> user <span class=\"token operator\">!&#061;<\/span> current_user<span class=\"token punctuation\">:<\/span><br \/>\n                distance <span class=\"token operator\">&#061;<\/span> self<span class=\"token punctuation\">.<\/span>pearson<span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">.<\/span>all_user<span class=\"token punctuation\">[<\/span>current_user<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> self<span class=\"token punctuation\">.<\/span>all_user<span class=\"token punctuation\">[<\/span>user<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token comment\"># \u8ba1\u7b97\u4e24\u4e2a\u7528\u6237\u7684\u76f8\u4f3c\u5ea6<\/span><br \/>\n                distances<span class=\"token punctuation\">[<\/span>user<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> distance<br \/>\n        closest_distance <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">sorted<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            distances<span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> key<span class=\"token operator\">&#061;<\/span>operator<span class=\"token punctuation\">.<\/span>itemgetter<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> reverse<span class=\"token operator\">&#061;<\/span><span class=\"token boolean\">True<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token comment\"># \u6700\u76f8\u4f3c\u7684N\u4e2a\u7528\u6237<\/span><br \/>\n        <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;closest user:&#034;<\/span><span class=\"token punctuation\">,<\/span> closest_distance<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span>n<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> closest_distance<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span>n<span class=\"token punctuation\">]<\/span><\/p>\n<p>    <span class=\"token comment\"># \u7ed9\u7528\u6237\u63a8\u8350\u7535\u5f71<\/span><br \/>\n    <span class=\"token keyword\">def<\/span> <span class=\"token function\">recommend<\/span><span class=\"token punctuation\">(<\/span>self<span class=\"token punctuation\">,<\/span> username<span class=\"token punctuation\">,<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        recommend <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n        nearest_user <span class=\"token operator\">&#061;<\/span> self<span class=\"token punctuation\">.<\/span>nearest_user<span class=\"token punctuation\">(<\/span>username<span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> user<span class=\"token punctuation\">,<\/span> score <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">dict<\/span><span class=\"token punctuation\">(<\/span>nearest_user<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>  <span class=\"token comment\"># \u6700\u76f8\u8fd1\u7684n\u4e2a\u7528\u6237<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> movies<span class=\"token punctuation\">,<\/span> scores <span class=\"token keyword\">in<\/span> self<span class=\"token punctuation\">.<\/span>all_user<span class=\"token punctuation\">[<\/span>user<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>  <span class=\"token comment\"># \u63a8\u8350\u7684\u7528\u6237\u7684\u7535\u5f71\u5217\u8868<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> movies <span class=\"token keyword\">not<\/span> <span class=\"token keyword\">in<\/span> self<span class=\"token punctuation\">.<\/span>all_user<span class=\"token punctuation\">[<\/span>username<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>keys<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>  <span class=\"token comment\"># \u5f53\u524dusername\u6ca1\u6709\u770b\u8fc7<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> movies <span class=\"token keyword\">not<\/span> <span class=\"token keyword\">in<\/span> recommend<span class=\"token punctuation\">.<\/span>keys<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>  <span class=\"token comment\"># \u6dfb\u52a0\u5230\u63a8\u8350\u5217\u8868\u4e2d<\/span><br \/>\n                        recommend<span class=\"token punctuation\">[<\/span>movies<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> scores<span class=\"token operator\">*<\/span>score<br \/>\n        <span class=\"token comment\"># \u5bf9\u63a8\u8350\u7684\u7ed3\u679c\u6309\u7167\u7535\u5f71<\/span><br \/>\n        <span class=\"token comment\"># \u6d4f\u89c8\u6b21\u6570\u6392\u5e8f<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token builtin\">sorted<\/span><span class=\"token punctuation\">(<\/span>recommend<span class=\"token punctuation\">.<\/span>items<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> key<span class=\"token operator\">&#061;<\/span>operator<span class=\"token punctuation\">.<\/span>itemgetter<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> reverse<span class=\"token operator\">&#061;<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u57fa\u4e8e\u7528\u6237\u7684\u63a8\u8350<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">recommend_by_user_id<\/span><span class=\"token punctuation\">(<\/span>user_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    user_prefer <span class=\"token operator\">&#061;<\/span> UserTagPrefer<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span>user_id<span class=\"token operator\">&#061;<\/span>user_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>order_by<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;-score&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>values_list<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;tag_id&#039;<\/span><span class=\"token punctuation\">,<\/span> flat<span class=\"token operator\">&#061;<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    current_user <span class=\"token operator\">&#061;<\/span> User<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span>get<span class=\"token punctuation\">(<\/span><span class=\"token builtin\">id<\/span><span class=\"token operator\">&#061;<\/span>user_id<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># \u5982\u679c\u5f53\u524d\u7528\u6237\u6ca1\u6709\u6253\u5206 \u5219\u770b\u662f\u5426\u9009\u62e9\u8fc7\u6807\u7b7e&#xff0c;\u9009\u8fc7\u7684\u8bdd&#xff0c;\u5c31\u4ece\u6807\u7b7e\u4e2d\u627e<\/span><br \/>\n    <span class=\"token comment\"># \u6ca1\u6709\u7684\u8bdd&#xff0c;\u5c31\u6309\u7167\u6d4f\u89c8\u5ea6\u63a8\u835015\u4e2a<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> current_user<span class=\"token punctuation\">.<\/span>rate_set<span class=\"token punctuation\">.<\/span>count<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>user_prefer<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            movie_list <span class=\"token operator\">&#061;<\/span> Movie<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span>tags__in<span class=\"token operator\">&#061;<\/span>user_prefer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">]<\/span><br \/>\n        <span class=\"token keyword\">else<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            movie_list <span class=\"token operator\">&#061;<\/span> Movie<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span>order_by<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;-num&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">]<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> movie_list<br \/>\n    <span class=\"token comment\"># \u9009\u53d6\u8bc4\u5206\u6700\u591a\u768410\u4e2a\u7528\u6237<\/span><br \/>\n    users_rate <span class=\"token operator\">&#061;<\/span> Rate<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span>values<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;user&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>annotate<span class=\"token punctuation\">(<\/span>mark_num<span class=\"token operator\">&#061;<\/span>Count<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;user&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>order_by<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;-mark_num&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    user_ids <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>user_rate<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#039;user&#039;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token keyword\">for<\/span> user_rate <span class=\"token keyword\">in<\/span> users_rate<span class=\"token punctuation\">]<\/span><br \/>\n    user_ids<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>user_id<span class=\"token punctuation\">)<\/span><br \/>\n    users <span class=\"token operator\">&#061;<\/span> User<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span>id__in<span class=\"token operator\">&#061;<\/span>user_ids<span class=\"token punctuation\">)<\/span><span class=\"token comment\">#users \u4e3a\u8bc4\u5206\u6700\u591a\u768410\u4e2a\u7528\u6237<\/span><br \/>\n    all_user <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> user <span class=\"token keyword\">in<\/span> users<span class=\"token punctuation\">:<\/span><br \/>\n        rates <span class=\"token operator\">&#061;<\/span> user<span class=\"token punctuation\">.<\/span>rate_set<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">all<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token comment\">#\u67e5\u51fa10\u540d\u7528\u6237\u7684\u6570\u636e<\/span><br \/>\n        rate <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\"># \u7528\u6237\u6709\u7ed9\u7535\u5f71\u6253\u5206 \u5728rate\u548call_user\u4e2d\u8fdb\u884c\u8bbe\u7f6e<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> rates<span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> rates<span class=\"token punctuation\">:<\/span><br \/>\n                rate<span class=\"token punctuation\">.<\/span>setdefault<span class=\"token punctuation\">(<\/span><span class=\"token builtin\">str<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">.<\/span>movie<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">id<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">.<\/span>mark<span class=\"token punctuation\">)<\/span><span class=\"token comment\">#\u586b\u5145\u7535\u5f71\u6570\u636e<\/span><br \/>\n            all_user<span class=\"token punctuation\">.<\/span>setdefault<span class=\"token punctuation\">(<\/span>user<span class=\"token punctuation\">.<\/span>username<span class=\"token punctuation\">,<\/span> rate<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">else<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token comment\"># \u7528\u6237\u6ca1\u6709\u4e3a\u7535\u5f71\u6253\u8fc7\u5206&#xff0c;\u8bbe\u4e3a0<\/span><br \/>\n            all_user<span class=\"token punctuation\">.<\/span>setdefault<span class=\"token punctuation\">(<\/span>user<span class=\"token punctuation\">.<\/span>username<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    user_cf <span class=\"token operator\">&#061;<\/span> UserCf<span class=\"token punctuation\">(<\/span>all_user<span class=\"token operator\">&#061;<\/span>all_user<span class=\"token punctuation\">)<\/span><br \/>\n    recommend_list <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span>each<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token keyword\">for<\/span> each <span class=\"token keyword\">in<\/span> user_cf<span class=\"token punctuation\">.<\/span>recommend<span class=\"token punctuation\">(<\/span>current_user<span class=\"token punctuation\">.<\/span>username<span class=\"token punctuation\">,<\/span> <span class=\"token number\">15<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    movie_list <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>Movie<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span>id__in<span class=\"token operator\">&#061;<\/span>recommend_list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>order_by<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;-num&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    other_length <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">15<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>movie_list<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> other_length <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        fix_list <span class=\"token operator\">&#061;<\/span> Movie<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">~<\/span>Q<span class=\"token punctuation\">(<\/span>rate__user_id<span class=\"token operator\">&#061;<\/span>user_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>order_by<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;-collect&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> fix <span class=\"token keyword\">in<\/span> fix_list<span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> fix <span class=\"token keyword\">not<\/span> <span class=\"token keyword\">in<\/span> movie_list<span class=\"token punctuation\">:<\/span><br \/>\n                movie_list<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>fix<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>movie_list<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">15<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> movie_list<\/p>\n<p><span class=\"token comment\"># \u8ba1\u7b97\u76f8\u4f3c\u5ea6<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">similarity<\/span><span class=\"token punctuation\">(<\/span>movie1_id<span class=\"token punctuation\">,<\/span> movie2_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    movie1_set <span class=\"token operator\">&#061;<\/span> Rate<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span>movie_id<span class=\"token operator\">&#061;<\/span>movie1_id<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># movie1\u7684\u6253\u5206\u7528\u6237\u6570<\/span><br \/>\n    movie1_sum <span class=\"token operator\">&#061;<\/span> movie1_set<span class=\"token punctuation\">.<\/span>count<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># movie_2\u7684\u6253\u5206\u7528\u6237\u6570<\/span><br \/>\n    movie2_sum <span class=\"token operator\">&#061;<\/span> Rate<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span>movie_id<span class=\"token operator\">&#061;<\/span>movie2_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>count<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># \u4e24\u8005\u7684\u4ea4\u96c6<\/span><br \/>\n    common <span class=\"token operator\">&#061;<\/span> Rate<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span>user_id__in<span class=\"token operator\">&#061;<\/span>Subquery<span class=\"token punctuation\">(<\/span>movie1_set<span class=\"token punctuation\">.<\/span>values<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;user_id&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> movie<span class=\"token operator\">&#061;<\/span>movie2_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>values<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;user_id&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>count<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># \u6ca1\u6709\u4eba\u7ed9\u5f53\u524d\u7535\u5f71\u6253\u5206<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> movie1_sum <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">or<\/span> movie2_sum <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><br \/>\n    similar_value <span class=\"token operator\">&#061;<\/span> common <span class=\"token operator\">\/<\/span> sqrt<span class=\"token punctuation\">(<\/span>movie1_sum <span class=\"token operator\">*<\/span> movie2_sum<span class=\"token punctuation\">)<\/span><span class=\"token comment\">#\u4f59\u5f26\u8ba1\u7b97\u76f8\u4f3c\u5ea6<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> similar_value<\/p>\n<p><span class=\"token comment\">#\u57fa\u4e8e\u7269\u54c1<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">recommend_by_item_id<\/span><span class=\"token punctuation\">(<\/span>user_id<span class=\"token punctuation\">,<\/span> k<span class=\"token operator\">&#061;<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token comment\"># \u524d\u4e09\u7684tag&#xff0c;\u7528\u6237\u8bc4\u5206\u524d\u4e09\u7684\u7535\u5f71<\/span><br \/>\n    user_prefer <span class=\"token operator\">&#061;<\/span> UserTagPrefer<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span>user_id<span class=\"token operator\">&#061;<\/span>user_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>order_by<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;-score&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>values_list<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;tag_id&#039;<\/span><span class=\"token punctuation\">,<\/span> flat<span class=\"token operator\">&#061;<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    user_prefer <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>user_prefer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    current_user <span class=\"token operator\">&#061;<\/span> User<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span>get<span class=\"token punctuation\">(<\/span><span class=\"token builtin\">id<\/span><span class=\"token operator\">&#061;<\/span>user_id<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># \u5982\u679c\u5f53\u524d\u7528\u6237\u6ca1\u6709\u6253\u5206 \u5219\u770b\u662f\u5426\u9009\u62e9\u8fc7\u6807\u7b7e&#xff0c;\u9009\u8fc7\u7684\u8bdd&#xff0c;\u5c31\u4ece\u6807\u7b7e\u4e2d\u627e<\/span><br \/>\n    <span class=\"token comment\"># \u6ca1\u6709\u7684\u8bdd&#xff0c;\u5c31\u6309\u7167\u6d4f\u89c8\u5ea6\u63a8\u835015\u4e2a<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> current_user<span class=\"token punctuation\">.<\/span>rate_set<span class=\"token punctuation\">.<\/span>count<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>user_prefer<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            movie_list <span class=\"token operator\">&#061;<\/span> Movie<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span>tags__in<span class=\"token operator\">&#061;<\/span>user_prefer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">]<\/span><br \/>\n        <span class=\"token keyword\">else<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            movie_list <span class=\"token operator\">&#061;<\/span> Movie<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span>order_by<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;-num&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">]<\/span><br \/>\n        <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;from here&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> movie_list<br \/>\n    <span class=\"token comment\"># most_tags &#061; Tags.objects.annotate(tags_sum&#061;Count(&#039;name&#039;)).order_by(&#039;-tags_sum&#039;).filter(movie__rate__user_id&#061;user_id).order_by(&#039;-tags_sum&#039;)<\/span><br \/>\n    <span class=\"token comment\"># \u9009\u7528\u6237\u6700\u559c\u6b22\u7684\u6807\u7b7e\u4e2d\u7684\u7535\u5f71&#xff0c;\u7528\u6237\u6ca1\u770b\u8fc7\u768430\u90e8&#xff0c;\u5bf9\u8fd930\u90e8\u7535\u5f71&#xff0c;\u8ba1\u7b97\u8ddd\u79bb\u6700\u8fd1<\/span><br \/>\n    un_watched <span class=\"token operator\">&#061;<\/span> Movie<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">~<\/span>Q<span class=\"token punctuation\">(<\/span>rate__user_id<span class=\"token operator\">&#061;<\/span>user_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> tags__in<span class=\"token operator\">&#061;<\/span>user_prefer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>order_by<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;?&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">30<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># \u770b\u8fc7\u7684\u7535\u5f71<\/span><br \/>\n    watched <span class=\"token operator\">&#061;<\/span> Rate<span class=\"token punctuation\">.<\/span>objects<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">filter<\/span><span class=\"token punctuation\">(<\/span>user_id<span class=\"token operator\">&#061;<\/span>user_id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span>values_list<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;movie_id&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;mark&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    distances <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    names <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token comment\"># \u5728\u672a\u770b\u8fc7\u7684\u7535\u5f71\u4e2d\u627e\u5230<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> un_watched_movie <span class=\"token keyword\">in<\/span> un_watched<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> watched_movie <span class=\"token keyword\">in<\/span> watched<span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> un_watched_movie <span class=\"token keyword\">not<\/span> <span class=\"token keyword\">in<\/span> names<span class=\"token punctuation\">:<\/span><br \/>\n                names<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>un_watched_movie<span class=\"token punctuation\">)<\/span><br \/>\n                distances<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>similarity<span class=\"token punctuation\">(<\/span>un_watched_movie<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">id<\/span><span class=\"token punctuation\">,<\/span> watched_movie<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> watched_movie<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> un_watched_movie<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token comment\">#\u52a0\u5165\u76f8\u4f3c\u7684\u7535\u5f71<\/span><br \/>\n    distances<span class=\"token punctuation\">.<\/span>sort<span class=\"token punctuation\">(<\/span>key<span class=\"token operator\">&#061;<\/span><span class=\"token keyword\">lambda<\/span> x<span class=\"token punctuation\">:<\/span> x<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> reverse<span class=\"token operator\">&#061;<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;this is distances&#039;<\/span><span class=\"token punctuation\">,<\/span> distances<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    recommend_list <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> mark<span class=\"token punctuation\">,<\/span> movie <span class=\"token keyword\">in<\/span> distances<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>recommend_list<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;&#061;<\/span> k<span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> movie <span class=\"token keyword\">not<\/span> <span class=\"token keyword\">in<\/span> recommend_list<span class=\"token punctuation\">:<\/span><br \/>\n            recommend_list<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>movie<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># print(&#039;this is recommend list&#039;, recommend_list)<\/span><br \/>\n    <span class=\"token comment\"># \u5982\u679c\u5f97\u4e0d\u5230\u6709\u6548\u6570\u91cf\u7684\u63a8\u8350 \u6309\u7167\u672a\u770b\u8fc7\u7684\u7535\u5f71\u4e2d\u7684\u70ed\u5ea6\u8fdb\u884c\u586b\u5145<\/span><br \/>\n    <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;recommend list&#039;<\/span><span class=\"token punctuation\">,<\/span> recommend_list<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> recommend_list<\/p>\n<p><span class=\"token keyword\">if<\/span> __name__ <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token string\">&#039;__main__&#039;<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    similarity<span class=\"token punctuation\">(<\/span><span class=\"token number\">2003<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2008<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    recommend_by_item_id<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h3>5\u3001\u6e90\u7801\u83b7\u53d6\u65b9\u5f0f<\/h3>\n<p>&#x1f345;\u7531\u4e8e\u7bc7\u5e45\u9650\u5236&#xff0c;\u83b7\u53d6\u5b8c\u6574\u6587\u7ae0\u6216\u6e90\u7801\u3001\u4ee3\u505a\u9879\u76ee\u7684&#xff0c;\u67e5\u770b\u6211\u7684\u3010\u7528\u6237\u540d\u3011\u3001\u3010\u4e13\u680f\u540d\u79f0\u3011\u3001\u3010\u9876\u90e8\u9009\u9898\u94fe\u63a5\u3011\u5c31\u53ef\u4ee5\u627e\u5230\u6211\u5566&#x1f345;<\/p>\n<p>\u611f\u5174\u8da3\u7684\u53ef\u4ee5\u5148\u6536\u85cf\u8d77\u6765&#xff0c;\u70b9\u8d5e\u3001\u5173\u6ce8\u4e0d\u8ff7\u8def&#xff0c;\u4e0b\u65b9\u67e5\u770b&#x1f447;&#x1f3fb;\u83b7\u53d6\u8054\u7cfb\u65b9\u5f0f&#x1f447;&#x1f3fb;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u535a\u4e3b\u4ecb\u7ecd&#xff1a;\u270c\u5168\u7f51\u7c89\u4e1d10W,\u524d\u4e92\u8054\u7f51\u5927\u5382\u8f6f\u4ef6\u7814\u53d1\u3001\u96c6\u7ed3\u7855\u535a\u82f1\u8c6a\u6210\u7acb\u5de5\u4f5c\u5ba4\u3002\u4e13\u6ce8\u4e8e\u8ba1\u7b97\u673a\u76f8\u5173\u4e13\u4e1a\u9879\u76ee\u5b9e\u62186\u5e74\u4e4b\u4e45&#xff0c;\u9009\u62e9\u6211\u4eec\u5c31\u662f\u9009\u62e9\u653e\u5fc3\u3001\u9009\u62e9\u5b89\u5fc3\u6bd5\u4e1a\u270c 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