{"id":205463,"date":"2025-05-29T11:36:21","date_gmt":"2025-05-29T03:36:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205463\/"},"modified":"2025-05-29T11:36:21","modified_gmt":"2025-05-29T03:36:21","slug":"python%e5%ad%97%e5%85%b8%e4%b8%ad%e4%b8%ba%e4%bd%95%e4%bc%9a%e5%87%ba%e7%8e%b0none%e4%bd%9c%e4%b8%ba%e9%94%ae%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205463\/","title":{"rendered":"Python\u5b57\u5178\u4e2d\u4e3a\u4f55\u4f1a\u51fa\u73b0None\u4f5c\u4e3a\u952e\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Python\u5b57\u5178\u4e2d\u4e3a\u4f55\u4f1a\u51fa\u73b0None\u4f5c\u4e3a\u952e\uff1f<\/h1>\n<p>\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u52aa\u529b\u5b66\u4e60\u5427\uff01\u672c\u6587\u4e3b\u8981\u8bb2\u89e3\u4e86<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\u7b49\u7b49\u76f8\u5173\u77e5\u8bc6\u70b9\uff0c\u6211\u4f1a\u5728\u4e2d\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u7684\u7cfb\u5217\u6587\u7ae0\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u5e76\u79ef\u6781\u7559\u8a00\u5efa\u8bae\u3002\u4e0b\u9762\u5c31\u5148\u4e00\u8d77\u6765\u770b\u4e00\u4e0b\u672c\u7bc7\u6b63\u6587\u5185\u5bb9\u5427\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241202\/1733145707674db46bd2988.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>python\u5b57\u5178\u4e2d\u51fa\u73b0\u7a7a\u503c\u7684\u8c1c\u56e2<\/strong><\/p>\n<p>\u5728\u4e00\u4e2a\u9879\u76ee\u4e2d\uff0c\u5f00\u53d1\u8005\u60ca\u8bb6\u5730\u53d1\u73b0\u5b57\u5178\u4e2d\u5b58\u5728\u7a7a\u503c\uff0c\u800c\u5c1d\u8bd5\u8bbf\u95ee\u5b83\u65f6\u9047\u5230\u9519\u8bef\u3002\u4e0b\u9762\u662f\u4ee3\u7801\u7247\u6bb5\uff1a<\/p>\n<pre>for k,v in herb2class.items():\n    if v=='':\n        print('\u8fd9\u4e2akey\u662f', k)<\/pre>\n<p>\u7136\u800c\uff0c\u8f93\u51fa\u7ed3\u679c\u4ee4\u4eba\u8d39\u89e3\uff1a<\/p>\n<pre>\u8fd9\u4e2akey\u662f none<\/pre>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0cnone\u4e0d\u80fd\u4f5c\u4e3a\u5b57\u5178\u7684\u952e\u3002\u51fa\u4e8e\u7591\u60d1\uff0c\u5f00\u53d1\u8005\u5c1d\u8bd5\u4e86\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n<pre>herb2class[None]<\/pre>\n<p>\u4f46\u540c\u6837\u8fd4\u56de\u9519\u8bef\u3002<\/p>\n<p><strong>\u95ee\u9898\u7684\u6839\u6e90<\/strong><\/p>\n<p>\u8981\u4e86\u89e3\u8fd9\u79cd\u60c5\u51b5\u7684\u539f\u56e0\uff0c\u5fc5\u987b\u4ed4\u7ec6\u68c0\u67e5\u5b57\u5178 itself\u3002\u6253\u5370herb2class\u5c06\u663e\u793a\u5305\u542bnone\u952e\u548c\u7a7a\u503c(&#8221;)\u7684\u5143\u7d20\u3002\u8fd9\u53ef\u80fd\u662f\u4e00\u79cd\u9519\u8bef\u6216\u610f\u5916\u884c\u4e3a\u7684\u7ed3\u679c\u3002<\/p>\n<p><strong>none\u4f5c\u4e3a\u5b57\u5178\u952e<\/strong><\/p>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cnone\u5b9e\u9645\u4e0a\u662f\u53ef\u4ee5\u4f5c\u4e3a\u5b57\u5178\u952e\u7684\u3002\u8fd9\u662f\u56e0\u4e3a\u5b57\u5178\u7684\u952e\u5fc5\u987b\u662f\u53ef\u54c8\u5e0c\u5bf9\u8c61\uff0c\u5305\u62ec\u6570\u5b57\u3001\u5b57\u7b26\u4e32\u3001\u5143\u7ec4\u548c\u5b9e\u73b0\u4e86__hash__\u548c__eq__\u65b9\u6cd5\u7684\u5bf9\u8c61\u3002none\u5c5e\u4e8e\u8fd9\u4e00\u7c7b\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f5c\u4e3a\u5b57\u5178\u952e\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6cd5<\/strong><\/p>\n<p>\u867d\u7136\u7565\u8fc7\u95ee\u9898\u952e\u662f\u89e3\u51b3\u65b9\u6cd5\uff0c\u4f46\u4e86\u89e3\u95ee\u9898\u7684\u539f\u56e0\u4e5f\u5f88\u91cd\u8981\u3002\u901a\u5e38\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u8bc6\u522b\u6f5c\u5728\u7684\u9519\u8bef\u6216\u6539\u8fdb\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<p>\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aPython\u5b57\u5178\u4e2d\u4e3a\u4f55\u4f1a\u51fa\u73b0None\u4f5c\u4e3a\u952e\uff1f\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u516c\u4f17\u53f7\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Python\u5b57\u5178\u4e2d\u4e3a\u4f55\u4f1a\u51fa\u73b0No&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-205463","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205463","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=205463"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205463\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205463"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205463"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205463"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}