{"id":204671,"date":"2025-05-29T12:22:14","date_gmt":"2025-05-29T04:22:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/204671\/"},"modified":"2025-05-29T12:22:14","modified_gmt":"2025-05-29T04:22:14","slug":"%e9%87%8d%e5%a4%8d%e5%ae%9e%e4%be%8b%e5%8c%96%e5%af%b9%e8%b1%a1%e8%a7%a6%e5%8f%91-del-%e6%96%b9%e6%b3%95%e5%af%bc%e8%87%b4%e5%bc%82%e5%b8%b8%ef%bc%9a%e5%a6%82%e4%bd%95%e9%81%bf%e5%85%8d-python","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/204671\/","title":{"rendered":"\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61\u89e6\u53d1 del \u65b9\u6cd5\u5bfc\u81f4\u5f02\u5e38\uff1a\u5982\u4f55\u907f\u514d Python \u4e2d\u7684\u6570\u636e\u5e93\u8fde\u63a5\u9519\u8bef\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61\u89e6\u53d1 del \u65b9\u6cd5\u5bfc\u81f4\u5f02\u5e38\uff1a\u5982\u4f55\u907f\u514d Python \u4e2d\u7684\u6570\u636e\u5e93\u8fde\u63a5\u9519\u8bef\uff1f<\/h1>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241112\/1731422376673368a8125aa.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61\u89e6\u53d1 <strong>del<\/strong> \u65b9\u6cd5\u5bfc\u81f4\u5f02\u5e38<\/strong><\/p>\n<p>\u5728\u8fd9\u4e2a\u95ee\u9898\u4e2d\uff0c\u4ee3\u7801\u4e2d\u51fa\u73b0\u4e86\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61\u89e6\u53d1 <strong>del<\/strong> \u65b9\u6cd5\u5bfc\u81f4\u5f02\u5e38\u7684\u60c5\u51b5\u3002<\/p>\n<p><strong>\u5206\u6790\uff1a<\/strong><\/p>\n<p>\u95ee\u9898\u4ee3\u7801\u4e2d\uff0csocketsetting \u7c7b\u4e2d\u6709\u4e00\u4e2a __del__ \u65b9\u6cd5\uff0c\u7528\u4e8e\u5173\u95ed\u6570\u636e\u5e93\u8fde\u63a5\u3002\u5728 run \u7c7b\u4e2d\uff0c\u91cd\u590d\u5b9e\u4f8b\u5316\u4e86\u4e09\u4e2a socketsetting \u5b9e\u4f8b\uff0c\u5bfc\u81f4\u4e86\u6570\u636e\u5e93\u8fde\u63a5\u7684\u5f02\u5e38\u5173\u95ed\u3002<\/p>\n<p><strong>\u89e3\u51b3\uff1a<\/strong><\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u8003\u8651\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li>\u5728 socketsetting \u7c7b\u7684 __del__ \u65b9\u6cd5\u4e2d\uff0c\u6dfb\u52a0\u5bf9 self.db \u7684\u5224\u65ad\uff0c\u786e\u4fdd\u5728\u8c03\u7528 __del__ \u65b9\u6cd5\u65f6\uff0c\u6570\u636e\u5e93\u8fde\u63a5\u662f\u6709\u6548\u7684\u3002<\/li>\n<\/ul>\n<p><strong>\u4ee3\u7801\uff1a<\/strong><\/p>\n<pre>def __del__(self):\n    print('\u9500\u6bc1\u8fde\u63a5', self.name)\n    if self.db:\n        self.db.cursor.close()\n        self.db.conn.close()<\/pre>\n<ul>\n<li>\u66f4\u597d\u5730\u5b9e\u8df5\u662f\uff0c\u5728\u4ee3\u7801\u4e2d\u663e\u5f0f\u5730\u5173\u95ed\u6570\u636e\u5e93\u8fde\u63a5\uff0c\u6216\u8005\u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668 (with \u8bed\u53e5) \u6765\u7ba1\u7406\u6570\u636e\u5e93\u8fde\u63a5\u7684\u751f\u547d\u5468\u671f\uff0c\u4ee5\u786e\u4fdd\u5728\u4f7f\u7528\u5b8c\u6bd5\u540e\u53ca\u65f6\u91ca\u653e\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<p><strong>\u4ee3\u7801\uff1a<\/strong><\/p>\n<pre>with Mydb(name) as db:\n    # \u4f7f\u7528\u6570\u636e\u5e93\u8fde\u63a5\n    db.query('...')<\/pre>\n<p><strong>\u5efa\u8bae\uff1a<\/strong><\/p>\n<ul>\n<li>\u907f\u514d\u5728 __del__ \u65b9\u6cd5\u4e2d\u8fdb\u884c\u590d\u6742\u7684\u64cd\u4f5c\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u53d1\u751f\u3002<\/li>\n<li>\u6700\u597d\u901a\u8fc7\u663e\u5f0f\u5730\u7ba1\u7406\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u6765\u907f\u514d <strong>del<\/strong> \u65b9\u6cd5\u5bfc\u81f4\u7684\u5f02\u5e38\u3002<\/li>\n<\/ul>\n<p>\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61\u89e6\u53d1 del \u65b9\u6cd5\u5bfc\u81f4\u5f02\u5e38\uff1a\u5982\u4f55\u907f\u514d Python \u4e2d\u7684\u6570\u636e\u5e93\u8fde\u63a5\u9519\u8bef\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61\u89e6\u53d1 del \u65b9\u6cd5&#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-204671","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204671","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=204671"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204671\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=204671"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=204671"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=204671"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}