{"id":204930,"date":"2025-05-29T14:45:55","date_gmt":"2025-05-29T06:45:55","guid":{"rendered":"https:\/\/server.hk\/cnblog\/204930\/"},"modified":"2025-05-29T14:45:55","modified_gmt":"2025-05-29T06:45:55","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8__init_subclass__%e6%96%b9%e6%b3%95%e4%bf%ae%e6%94%b9%e8%a2%ab%e5%af%bc%e5%85%a5%e7%b1%bb%e7%9a%84%e7%b1%bb%e5%9e%8b%e6%8f%90%e7%a4%ba%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/204930\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528__init_subclass__\u65b9\u6cd5\u4fee\u6539\u88ab\u5bfc\u5165\u7c7b\u7684\u7c7b\u578b\u63d0\u793a\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5982\u4f55\u4f7f\u7528__init_subclass__\u65b9\u6cd5\u4fee\u6539\u88ab\u5bfc\u5165\u7c7b\u7684\u7c7b\u578b\u63d0\u793a\uff1f<\/h1>\n

\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u6211\u4eec\u8981\u52aa\u529b\u5b66\u4e60\u5566\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4e0b\u6587\u4e2d\u7684\u5185\u5bb9\u6211\u4eec\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5728\u9605\u8bfb\u672c\u6587\u8fc7\u7a0b\u4e2d\u6709\u9047\u5230\u4e0d\u6e05\u695a\u7684\u5730\u65b9\uff0c\u6b22\u8fce\u7559\u8a00\u5440\uff01\u6211\u4eec\u4e00\u8d77\u8ba8\u8bba\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

<\/p>\n

\u5982\u4f55\u4fee\u6539\u88ab\u5bfc\u5165\u7c7b\u7684\u7c7b\u578b\u63d0\u793a<\/strong><\/p>\n

\u5728python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u91cd\u7ee7\u627f\u6765\u5728\u7c7b\u578b\u63d0\u793a\u4e2d\u5b9e\u73b0\u5bf9\u6307\u9488\u7684\u652f\u6301\u3002\u7136\u800c\uff0c\u76f4\u63a5\u4f7f\u7528__new__\u65b9\u6cd5\u4f1a\u9047\u5230\u4e00\u4e2a\u95ee\u9898\uff1a\u5b9e\u4f8b\u5316\u7684\u7c7b\u578b\u4e0d\u7b49\u4e8e\u7c7b\u672c\u8eab\u3002<\/p>\n

\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u6539\u7528__init_subclass__\u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u5728\u7c7b\u7684\u5b50\u7c7b\u521b\u5efa\u65f6\u88ab\u8c03\u7528\uff0c\u5e76\u4e14\u63a5\u6536\u4e00\u4e2acls\u53c2\u6570\uff0c\u8868\u793a\u5b50\u7c7b\u672c\u8eab\u3002\u5728__init_subclass__\u65b9\u6cd5\u4e2d\uff0c\u53ef\u4ee5\u5bf9\u5b50\u7c7b\u8fdb\u884c\u4fee\u6539\uff0c\u4f8b\u5982\u6dfb\u52a0\u7c7b\u578b\u63d0\u793a\u6216\u91cd\u5199\u7279\u6b8a\u65b9\u6cd5\u3002<\/p>\n

\u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528__init_subclass__\u65b9\u6cd5\u4fee\u6539\u88ab\u5bfc\u5165\u7c7b\u7684\u7c7b\u578b\u63d0\u793a\uff1a<\/p>\n

class Pointer:\n\n    def __init_subclass__(cls, **kwargs):\n        bases = tuple(set(cls.__bases__) - {Pointer})\n        assert len(bases) <= 1, '\u53ea\u80fd\u518d\u7ee7\u627f\u4e00\u4e2a\u7c7b'\n        assert len(bases), '\u5fc5\u987b\u518d\u7ee7\u627f\u4e00\u4e2a\u7c7b'\n        bases = bases[0]\n        for fun_name in dir(cls):\n            if fun_name not in not_transfer_fun and callable(getattr(cls, fun_name)):\n                setattr(cls, fun_name, fun_transfer(getattr(cls, fun_name)))\n        cls.__init__ = __init__\n        cls.__setattr__ = __setattr__\n        cls.__getattribute__ = __getattribute__\n        cls.__value__ = None\n        print(cls.__class__)\n        cls.__class__ = cls\n        cls.__type__ = bases\n        return cls<\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0cpointer\u7c7b\u6709\u4e00\u4e2a__init_subclass__\u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u9996\u5148\u68c0\u67e5\u5b50\u7c7b\u662f\u5426\u6b63\u786e\u7ee7\u627f\u4e86pointer\u7c7b\u3002\u7136\u540e\uff0c\u5b83\u5faa\u73af\u904d\u5386\u5b50\u7c7b\u7684\u65b9\u6cd5\u5e76\u5c06\u5176\u6807\u8bb0\u4e3a\u53ef\u4ee5\u8f6c\u6362\u3002\u63a5\u4e0b\u6765\uff0c\u5b83\u91cd\u65b0\u521d\u59cb\u5316\u7279\u6b8a\u65b9\u6cd5\u5e76\u8bbe\u7f6e\u9ed8\u8ba4\u503c\u3002<\/p>\n
\u4f7f\u7528__init_subclass__\u65b9\u6cd5\u4fee\u6539\u7c7b\u7c7b\u578b\u63d0\u793a\u6bd4\u4f7f\u7528__new__\u65b9\u6cd5\u66f4\u5b89\u5168\u7075\u6d3b\u3002\u5f53\u7ee7\u627fpointer\u7c7b\u7684\u5b50\u7c7b\u521b\u5efa\u65f6\uff0c__init_subclass__\u65b9\u6cd5\u81ea\u52a8\u8fd0\u884c\uff0c\u786e\u4fdd\u5b50\u7c7b\u7684\u7c7b\u578b\u63d0\u793a\u6b63\u786e\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u4f55\u4f7f\u7528__init_subcl...<\/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-204930","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204930","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=204930"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204930\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=204930"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=204930"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=204930"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}