{"id":1041690,"date":"2024-12-31T12:51:14","date_gmt":"2024-12-31T04:51:14","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1041690.html"},"modified":"2024-12-31T12:51:16","modified_gmt":"2024-12-31T04:51:16","slug":"python%e5%88%97%e8%a1%a8%e4%b8%ba%e7%a9%ba%e5%a6%82%e4%bd%95%e8%a1%a8%e8%be%be%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1041690.html","title":{"rendered":"python\u5217\u8868\u4e3a\u7a7a\u5982\u4f55\u8868\u8fbe\u5f0f"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2024\/12\/69e69ba1-dec6-4560-a43f-a27f672ea99a.webp?x-oss-process=image\/auto-orient,1\/format,webp\" alt=\"python\u5217\u8868\u4e3a\u7a7a\u5982\u4f55\u8868\u8fbe\u5f0f\" \/><\/p>\n<p><p> <strong>Python\u5217\u8868\u4e3a\u7a7a\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u8868\u8fbe\uff1a\u4f7f\u7528if not lst\u3001\u4f7f\u7528len(lst) == 0\u3001\u4f7f\u7528\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff08==\uff09<\/strong>\u3002\u5176\u4e2d\uff0c\u6700\u5e38\u7528\u4e14\u63a8\u8350\u7684\u65b9\u6cd5\u662f\u4f7f\u7528<strong>if not lst<\/strong>\uff0c\u56e0\u4e3a\u5b83\u7b80\u6d01\u4e14\u7b26\u5408Pythonic\u7684\u4ee3\u7801\u98ce\u683c\u3002<\/p>\n<\/p>\n<p><p>\u4f8b\u5982\uff0c\u5f53\u6211\u4eec\u6709\u4e00\u4e2a\u5217\u8868 <code>lst<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u68c0\u67e5\u5b83\u662f\u5426\u4e3a\u7a7a\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">lst = []<\/p>\n<h2><strong>\u65b9\u6cd5\u4e00\uff1aif not lst<\/strong><\/h2>\n<p>if not lst:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e3a\u7a7a&quot;)<\/p>\n<h2><strong>\u65b9\u6cd5\u4e8c\uff1alen(lst) == 0<\/strong><\/h2>\n<p>if len(lst) == 0:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e3a\u7a7a&quot;)<\/p>\n<h2><strong>\u65b9\u6cd5\u4e09\uff1a== \u8fd0\u7b97\u7b26<\/strong><\/h2>\n<p>if lst == []:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e3a\u7a7a&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4e0b\u9762\u662f\u66f4\u8be6\u7ec6\u7684\u89e3\u91ca\u548c\u5185\u5bb9\uff1a<\/p>\n<\/p>\n<p><p>\u4e00\u3001\u4f7f\u7528if not lst\u8868\u8fbe<\/p>\n<\/p>\n<p><p>\u4f7f\u7528 <code>if not lst<\/code> \u662f\u68c0\u67e5\u5217\u8868\u662f\u5426\u4e3a\u7a7a\u7684\u6700\u5e38\u7528\u65b9\u6cd5\u3002\u8fd9\u79cd\u65b9\u6cd5\u5229\u7528\u4e86Python\u4e2d\u7684\u5e03\u5c14\u4e0a\u4e0b\u6587\u3002\u4e00\u4e2a\u7a7a\u7684\u5217\u8868\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u4f1a\u88ab\u8bc4\u4f30\u4e3a <code>False<\/code>\uff0c\u56e0\u6b64 <code>not lst<\/code> \u4f1a\u88ab\u8bc4\u4f30\u4e3a <code>True<\/code>\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">lst = []<\/p>\n<p>if not lst:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e3a\u7a7a&quot;)<\/p>\n<p>else:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e0d\u4e3a\u7a7a&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u4ee3\u7801\u7b80\u6d01\u3001\u6613\u8bfb\uff0c\u5e76\u4e14\u7b26\u5408Python\u7684\u60ef\u7528\u98ce\u683c\u3002<\/p>\n<\/p>\n<p><p>\u4e8c\u3001\u4f7f\u7528len(lst) == 0<\/p>\n<\/p>\n<p><p>\u53e6\u4e00\u79cd\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 <code>len()<\/code> \u51fd\u6570\u6765\u83b7\u53d6\u5217\u8868\u7684\u957f\u5ea6\uff0c\u5982\u679c\u957f\u5ea6\u4e3a0\uff0c\u5219\u8868\u793a\u5217\u8868\u4e3a\u7a7a\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">lst = []<\/p>\n<p>if len(lst) == 0:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e3a\u7a7a&quot;)<\/p>\n<p>else:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e0d\u4e3a\u7a7a&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u76f4\u89c2\uff0c\u6e05\u6670\u5730\u663e\u793a\u4e86\u6211\u4eec\u5728\u68c0\u67e5\u5217\u8868\u7684\u957f\u5ea6\u3002\u4f46\u662f\uff0c\u76f8\u6bd4 <code>if not lst<\/code>\uff0c\u8fd9\u79cd\u65b9\u6cd5\u7a0d\u663e\u5197\u957f\u3002<\/p>\n<\/p>\n<p><p>\u4e09\u3001\u4f7f\u7528\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff08==\uff09<\/p>\n<\/p>\n<p><p>\u6211\u4eec\u8fd8\u53ef\u4ee5\u76f4\u63a5\u5c06\u5217\u8868\u4e0e\u4e00\u4e2a\u7a7a\u5217\u8868\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">lst = []<\/p>\n<p>if lst == []:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e3a\u7a7a&quot;)<\/p>\n<p>else:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e0d\u4e3a\u7a7a&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u4e5f\u5f88\u76f4\u89c2\uff0c\u4f46\u5728Python\u4e2d\u4e0d\u5982 <code>if not lst<\/code> \u8fd9\u79cd\u65b9\u6cd5\u5e38\u7528\uff0c\u56e0\u4e3a\u5b83\u5728\u6bcf\u6b21\u6bd4\u8f83\u65f6\u90fd\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u7a7a\u5217\u8868\u3002<\/p>\n<\/p>\n<p><p>\u56db\u3001\u5176\u4ed6\u65b9\u6cd5<\/p>\n<\/p>\n<p><p>\u9664\u4e86\u4e0a\u8ff0\u4e09\u79cd\u5e38\u7528\u65b9\u6cd5\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u4e0d\u592a\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u4f8b\u5982\uff1a<\/p>\n<\/p>\n<ol>\n<li>\u4f7f\u7528 <code>bool()<\/code> \u51fd\u6570\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">lst = []<\/p>\n<p>if not bool(lst):<\/p>\n<p>    print(&quot;\u5217\u8868\u4e3a\u7a7a&quot;)<\/p>\n<p>else:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e0d\u4e3a\u7a7a&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<ol start=\"2\">\n<li>\u4f7f\u7528 <code>any()<\/code> \u6216 <code>all()<\/code> \u51fd\u6570\uff1a<\/li>\n<\/ol>\n<p><pre><code class=\"language-python\">lst = []<\/p>\n<p>if not any(lst):<\/p>\n<p>    print(&quot;\u5217\u8868\u4e3a\u7a7a&quot;)<\/p>\n<p>else:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e0d\u4e3a\u7a7a&quot;)<\/p>\n<p>if not all(lst):<\/p>\n<p>    print(&quot;\u5217\u8868\u4e3a\u7a7a&quot;)<\/p>\n<p>else:<\/p>\n<p>    print(&quot;\u5217\u8868\u4e0d\u4e3a\u7a7a&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5c3d\u7ba1\u8fd9\u4e9b\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u76f8\u540c\u7684\u6548\u679c\uff0c\u4f46\u5b83\u4eec\u7684\u53ef\u8bfb\u6027\u548c\u6548\u7387\u4e0d\u5982\u524d\u4e09\u79cd\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><p>\u4e94\u3001\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u6ce8\u610f\u4e8b\u9879<\/p>\n<\/p>\n<p><p>\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u901a\u5e38\u4f1a\u9047\u5230\u9700\u8981\u68c0\u67e5\u591a\u4e2a\u5217\u8868\u662f\u5426\u4e3a\u7a7a\u7684\u60c5\u51b5\uff0c\u8fd9\u65f6\u53ef\u4ee5\u5c06\u68c0\u67e5\u5217\u8868\u662f\u5426\u4e3a\u7a7a\u7684\u903b\u8f91\u5c01\u88c5\u6210\u4e00\u4e2a\u51fd\u6570\uff0c\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def is_list_empty(lst):<\/p>\n<p>    return not lst<\/p>\n<p>lists = [[], [1, 2, 3], [], [4, 5]]<\/p>\n<p>for lst in lists:<\/p>\n<p>    if is_list_empty(lst):<\/p>\n<p>        print(&quot;\u5217\u8868\u4e3a\u7a7a&quot;)<\/p>\n<p>    else:<\/p>\n<p>        print(&quot;\u5217\u8868\u4e0d\u4e3a\u7a7a&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u603b\u7ed3\uff1a\u5728Python\u4e2d\uff0c\u68c0\u67e5\u5217\u8868\u662f\u5426\u4e3a\u7a7a\u7684\u5e38\u7528\u65b9\u6cd5\u6709\u4e09\u79cd\uff1a<strong>\u4f7f\u7528if not lst\u3001\u4f7f\u7528len(lst) == 0\u3001\u4f7f\u7528\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff08==\uff09<\/strong>\u3002\u5176\u4e2d\uff0c\u6700\u63a8\u8350\u7684\u65b9\u6cd5\u662f<strong>\u4f7f\u7528if not lst<\/strong>\uff0c\u56e0\u4e3a\u5b83\u7b80\u6d01\u3001\u76f4\u89c2\u4e14\u7b26\u5408Pythonic\u7684\u4ee3\u7801\u98ce\u683c\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u60c5\u51b5\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u5e76\u8003\u8651\u5c06\u903b\u8f91\u5c01\u88c5\u6210\u51fd\u6570\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u5982\u4f55\u68c0\u67e5\u4e00\u4e2aPython\u5217\u8868\u662f\u5426\u4e3a\u7a7a\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u7b80\u5355\u7684\u6761\u4ef6\u5224\u65ad\u6765\u68c0\u67e5\u4e00\u4e2a\u5217\u8868\u662f\u5426\u4e3a\u7a7a\u3002\u53ea\u9700\u4f7f\u7528<code>if not my_list:<\/code>\uff0c\u5176\u4e2d<code>my_list<\/code>\u662f\u4f60\u60f3\u68c0\u67e5\u7684\u5217\u8868\u3002\u5982\u679c\u5217\u8868\u4e3a\u7a7a\uff0c\u6761\u4ef6\u4e3a\u771f\uff0c\u4ee3\u7801\u5757\u5c06\u6267\u884c\u3002\u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528<code>len(my_list) == 0<\/code>\u6765\u68c0\u67e5\u5217\u8868\u7684\u957f\u5ea6\u662f\u5426\u4e3a\u96f6\u3002<\/p>\n<p><strong>\u7a7a\u5217\u8868\u5728Python\u4e2d\u4f1a\u600e\u6837\u8868\u73b0\uff1f<\/strong><br \/>\u7a7a\u5217\u8868\u5728Python\u4e2d\u8868\u793a\u4e3a<code>[]<\/code>\u3002\u5f53\u4f60\u6253\u5370\u4e00\u4e2a\u7a7a\u5217\u8868\u65f6\uff0c\u8f93\u51fa\u5c06\u662f\u65b9\u62ec\u53f7\u800c\u4e0d\u5305\u542b\u4efb\u4f55\u5143\u7d20\u3002\u8fd9\u79cd\u8868\u73b0\u5f62\u5f0f\u4f7f\u5f97\u8bc6\u522b\u7a7a\u5217\u8868\u53d8\u5f97\u7b80\u5355\u660e\u4e86\u3002<\/p>\n<p><strong>\u5982\u4f55\u5728Python\u4e2d\u521b\u5efa\u4e00\u4e2a\u7a7a\u5217\u8868\uff1f<\/strong><br \/>\u521b\u5efa\u7a7a\u5217\u8868\u975e\u5e38\u7b80\u5355\u3002\u53ea\u9700\u4f7f\u7528<code>my_list = []<\/code>\u5373\u53ef\u3002\u5982\u679c\u9700\u8981\u52a8\u6001\u6dfb\u52a0\u5143\u7d20\uff0c\u53ef\u4ee5\u5148\u521b\u5efa\u7a7a\u5217\u8868\uff0c\u7136\u540e\u4f7f\u7528<code>append()<\/code>\u65b9\u6cd5\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u5217\u8868\u4e2d\uff0c\u4f8b\u5982<code>my_list.append(1)<\/code>\u3002<\/p>\n<p><strong>\u7a7a\u5217\u8868\u7684\u5e38\u89c1\u5e94\u7528\u573a\u666f\u6709\u54ea\u4e9b\uff1f<\/strong><br \/>\u7a7a\u5217\u8868\u5e38\u7528\u4e8e\u521d\u59cb\u5316\u6570\u636e\u7ed3\u6784\u3002\u5728\u7a0b\u5e8f\u5f00\u59cb\u65f6\uff0c\u53ef\u80fd\u5c1a\u672a\u6536\u96c6\u5230\u4efb\u4f55\u6570\u636e\uff0c\u8fd9\u65f6\u53ef\u4ee5\u901a\u8fc7\u521b\u5efa\u7a7a\u5217\u8868\u6765\u4e3a\u540e\u7eed\u7684\u6570\u636e\u5b58\u50a8\u505a\u597d\u51c6\u5907\u3002\u6b64\u5916\uff0c\u7a7a\u5217\u8868\u4e5f\u53ef\u4ee5\u4f5c\u4e3a\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff0c\u5f53\u6ca1\u6709\u5408\u9002\u7684\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u8fd4\u56de\u7a7a\u5217\u8868\u6765\u8868\u793a\u201c\u65e0\u7ed3\u679c\u201d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u5217\u8868\u4e3a\u7a7a\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u8868\u8fbe\uff1a\u4f7f\u7528if not lst\u3001\u4f7f\u7528len(lst) == 0\u3001\u4f7f [&hellip;]","protected":false},"author":3,"featured_media":1041697,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1041690"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=1041690"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1041690\/revisions"}],"predecessor-version":[{"id":1041699,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1041690\/revisions\/1041699"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1041697"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1041690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1041690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1041690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}