{"id":604,"date":"2023-04-15T05:17:21","date_gmt":"2024-01-30T22:00:43","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%a6%82%e4%bd%95%e5%9c%a8python%e4%b8%ad%e6%9f%a5%e6%89%be%e5%88%97%e8%a1%a8%e7%9a%84%e9%95%bf%e5%ba%a6\/"},"modified":"2025-08-02T22:05:59","modified_gmt":"2025-08-02T14:05:59","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8python%e4%b8%ad%e6%9f%a5%e6%89%be%e5%88%97%e8%a1%a8%e7%9a%84%e9%95%bf%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e4%bd%95%e5%9c%a8python%e4%b8%ad%e6%9f%a5%e6%89%be%e5%88%97%e8%a1%a8%e7%9a%84%e9%95%bf%e5%ba%a6\/","title":{"rendered":"Python\u57fa\u7840\uff1a\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u7684\u7b80\u5355\u65b9\u6cd5\u4e0elen()\u51fd\u6570\u6307\u5357"},"content":{"rendered":"<h3>\u4ecb\u7ecd<\/h3>\n<p>\u5728Python\u4e2d\uff0c\u6709\u51e0\u79cd\u6280\u5de7\u53ef\u4ee5\u7528\u6765\u67e5\u627e\u5217\u8868\u7684\u957f\u5ea6\u3002\u5217\u8868\u7684\u957f\u5ea6\u5c31\u662f\u5217\u8868\u4e2d\u5143\u7d20\u7684\u4e2a\u6570\u3002\u672c\u6587\u4ecb\u7ecd\u4e86\u4e09\u79cd\u65b9\u6cd5\u6765\u67e5\u627e\u5217\u8868\u7684\u957f\u5ea6\uff0c\u7136\u800c\uff0clen()\u65b9\u6cd5\u901a\u5e38\u662f\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u7684\u6700\u4f73\u9014\u5f84\uff0c\u56e0\u4e3a\u5b83\u662f\u6700\u9ad8\u6548\u7684\u3002\u7531\u4e8e\u5217\u8868\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5217\u8868\u7684\u5927\u5c0f\u5df2\u7ecf\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\u4ee5\u4fbf\u5feb\u901f\u68c0\u7d22\u3002<\/p>\n<h2>\u4f7f\u7528len()\u65b9\u6cd5\u6765\u83b7\u53d6\u5217\u8868\u7684\u957f\u5ea6<\/h2>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684len()\u65b9\u6cd5\u6765\u67e5\u627e\u5217\u8868\u7684\u957f\u5ea6\u3002<\/p>\n<p>len()\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u5e8f\u5217\u6216\u4e00\u4e2a\u96c6\u5408\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u5e8f\u5217\u6216\u96c6\u5408\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002<\/p>\n<p>len()\u7684\u8bed\u6cd5\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u793a\u4f8b\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5217\u8868\uff0c\u5e76\u4f7f\u7528len()\u65b9\u6cd5\u83b7\u53d6\u5217\u8868\u7684\u957f\u5ea6\u3002<\/p>\n<pre class=\"post-pre\"><code>inp_lst <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">'Python'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">'Java'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">'Ruby'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">'JavaScript'<\/span><span class=\"token punctuation\">]<\/span>\r\nsize <span class=\"token operator\">=<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>inp_lst<span class=\"token punctuation\">)<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>size<span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u4e3a\uff1a<\/p>\n<div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>4<\/code><\/pre>\n<h2>\u5bfb\u627e\u5217\u8868\u957f\u5ea6\u7684\u5176\u4ed6\u65b9\u6cd5<\/h2>\n<p>\u867d\u7136\u901a\u5e38\u4f7f\u7528len()\u65b9\u6cd5\u662f\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u7684\u6700\u4f73\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u6548\u7387\u6700\u9ad8\uff0c\u4f46\u5728Python\u4e2d\u8fd8\u6709\u5176\u4ed6\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u5217\u8868\u7684\u957f\u5ea6\u3002<\/p>\n<h3>\u4f7f\u7528length_hint()\u65b9\u6cd5\u83b7\u53d6\u5217\u8868\u7684\u957f\u5ea6<\/h3>\n<p>Python\u7684operator\u6a21\u5757\u4e2d\u6709\u4e00\u4e2alength_hint()\u65b9\u6cd5\uff0c\u7528\u4e8e\u4f30\u8ba1\u7ed9\u5b9a\u53ef\u8fed\u4ee3\u5bf9\u8c61\u7684\u957f\u5ea6\u3002\u5982\u679c\u957f\u5ea6\u5df2\u77e5\uff0clength_hint()\u65b9\u6cd5\u5c06\u8fd4\u56de\u5b9e\u9645\u7684\u957f\u5ea6\u3002\u5426\u5219\uff0clength_hint()\u65b9\u6cd5\u5c06\u8fd4\u56de\u4e00\u4e2a\u4f30\u8ba1\u7684\u957f\u5ea6\u3002\u5bf9\u4e8e\u5217\u8868\uff0c\u957f\u5ea6\u59cb\u7ec8\u662f\u5df2\u77e5\u7684\uff0c\u6240\u4ee5\u901a\u5e38\u53ea\u9700\u8981\u4f7f\u7528len()\u65b9\u6cd5\u3002<\/p>\n<p>length_hint()\u7684\u8bed\u6cd5\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code>length_hint<span class=\"token punctuation\">(<\/span><span class=\"token builtin\">object<\/span><span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u4e0b\u9762\u7684\u793a\u4f8b\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5217\u8868\uff0c\u5e76\u4f7f\u7528length_hint()\u65b9\u6cd5\u83b7\u53d6\u5217\u8868\u7684\u957f\u5ea6\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">from<\/span> operator <span class=\"token keyword\">import<\/span> length_hint \r\ninp_lst <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">'Python'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">'Java'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">'Ruby'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">'JavaScript'<\/span><span class=\"token punctuation\">]<\/span>\r\nsize <span class=\"token operator\">=<\/span> length_hint<span class=\"token punctuation\">(<\/span>inp_lst<span class=\"token punctuation\">)<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>size<span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u662f\uff1a<\/p>\n<div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>4<\/code><\/pre>\n<h3>\u4f7f\u7528for\u5faa\u73af\u6765\u83b7\u53d6\u5217\u8868\u7684\u957f\u5ea6<\/h3>\n<p>\u672c\u8282\u63d0\u4f9b\u4e00\u79cd\u8f83\u4e0d\u5b9e\u7528\u4f46\u4ecd\u5177\u6709\u4fe1\u606f\u91cf\u7684\u65b9\u6cd5\u6765\u8ba1\u7b97\u4e0d\u5e26\u7279\u6b8a\u65b9\u6cd5\u7684\u5217\u8868\u957f\u5ea6\u3002\u4f7f\u7528for\u5faa\u73af\u6765\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u4e5f\u88ab\u79f0\u4e3a\u6734\u7d20\u65b9\u6cd5\uff0c\u53ef\u4ee5\u9002\u7528\u4e8e\u51e0\u4e4e\u4efb\u4f55\u7f16\u7a0b\u8bed\u8a00\u3002<\/p>\n<p>\u4f7f\u7528for\u5faa\u73af\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u7684\u57fa\u672c\u6b65\u9aa4\u662f\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u58f0\u660e\u4e00\u4e2a\u8ba1\u6570\u5668\u53d8\u91cf\u5e76\u521d\u59cb\u5316\u4e3a\u96f6\u3002\n<pre class=\"post-pre\"><code>counter = 0<\/code><\/pre>\n<\/li>\n<li>\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u6240\u6709\u6570\u636e\u5143\u7d20\uff0c\u5e76\u5728\u9047\u5230\u6bcf\u4e2a\u5143\u7d20\u540e\u5c06\u8ba1\u6570\u5668\u53d8\u91cf\u589e\u52a01\u3002\n<pre class=\"post-pre\"><code>for item in list:\r\n    counter += 1<\/code><\/pre>\n<\/li>\n<li>\u6570\u7ec4\u7684\u957f\u5ea6\u5b58\u50a8\u5728\u8ba1\u6570\u5668\u53d8\u91cf\u4e2d\uff0c\u8be5\u53d8\u91cf\u8868\u793a\u5217\u8868\u4e2d\u7684\u5143\u7d20\u6570\u91cf\u3002\u8be5\u53d8\u91cf\u53ef\u4ee5\u5728\u5176\u4ed6\u4ee3\u7801\u4e2d\u4f7f\u7528\u6216\u8f93\u51fa\u3002\n<pre class=\"post-pre\"><code>print(counter)<\/code><\/pre>\n<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u83b7\u53d6\u5217\u8868\u7684\u957f\u5ea6\uff1a<\/p>\n<pre class=\"post-pre\"><code>inp_lst <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string\">'Python'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">'Java'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">'Ruby'<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">'JavaScript'<\/span><span class=\"token punctuation\">]<\/span>\r\nsize <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span>\r\n<span class=\"token keyword\">for<\/span> x <span class=\"token keyword\">in<\/span> inp_lst<span class=\"token punctuation\">:<\/span>\r\n    size <span class=\"token operator\">+=<\/span> <span class=\"token number\">1<\/span>\r\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>size<span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>\u7ed3\u679c\u662f\uff1a<\/p>\n<div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>4<\/code><\/pre>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u60a8\u5b66\u4e60\u5230\u4e86\u4e00\u4e9b\u5728Python\u4e2d\u67e5\u627e\u5217\u8868\u957f\u5ea6\u7684\u4e0d\u540c\u65b9\u6cd5\u3002\u7ee7\u7eed\u5b66\u4e60\u66f4\u591a\u7684Python\u6559\u7a0b\u5427\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ecb\u7ecd \u5728Python\u4e2d\uff0c\u6709\u51e0\u79cd\u6280\u5de7\u53ef\u4ee5\u7528\u6765\u67e5\u627e\u5217\u8868\u7684\u957f\u5ea6\u3002\u5217\u8868\u7684\u957f\u5ea6\u5c31\u662f\u5217\u8868\u4e2d\u5143\u7d20\u7684\u4e2a\u6570\u3002\u672c\u6587\u4ecb\u7ecd\u4e86\u4e09\u79cd\u65b9\u6cd5\u6765 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1722,1114,280,1372,1115],"class_list":{"0":"post-604","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-python-len","8":"tag-python","11":"tag-1115"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python\u57fa\u7840\uff1a\u83b7\u53d6\u5217\u8868\u957f\u5ea6\u7684\u7b80\u5355\u65b9\u6cd5\u4e0elen()\u51fd\u6570\u6307\u5357 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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