{"id":204559,"date":"2025-05-29T15:55:37","date_gmt":"2025-05-29T07:55:37","guid":{"rendered":"https:\/\/server.hk\/cnblog\/204559\/"},"modified":"2025-05-29T15:55:37","modified_gmt":"2025-05-29T07:55:37","slug":"python-%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e6%9c%ba%e5%88%b6%e4%b8%ad%ef%bc%8c%e9%87%8d%e5%a4%8d%e5%ae%9e%e4%be%8b%e5%8c%96%e5%af%b9%e8%b1%a1%e4%bc%9a%e8%a7%a6%e5%8f%91__del__%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/204559\/","title":{"rendered":"Python \u5783\u573e\u56de\u6536\u673a\u5236\u4e2d\uff0c\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61\u4f1a\u89e6\u53d1__del__\u65b9\u6cd5\uff0c\u4e3a\u4ec0\u4e48\u8fd9\u4f1a\u5bfc\u81f4\u5f02\u5e38\uff1f"},"content":{"rendered":"

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

Python \u5783\u573e\u56de\u6536\u673a\u5236\u4e2d\uff0c\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61\u4f1a\u89e6\u53d1__del__\u65b9\u6cd5\uff0c\u4e3a\u4ec0\u4e48\u8fd9\u4f1a\u5bfc\u81f4\u5f02\u5e38\uff1f<\/h1>\n

\u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5\u8bdd\u9001\u7ed9\u6b63\u5728\u5b66\u4e60\u7684\u670b\u53cb\u4eec\uff0c\u4e5f\u5e0c\u671b\u5728\u9605\u8bfb\u672c\u6587\u300aPython \u5783\u573e\u56de\u6536\u673a\u5236\u4e2d\uff0c\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61\u4f1a\u89e6\u53d1__del__\u65b9\u6cd5\uff0c\u4e3a\u4ec0\u4e48\u8fd9\u4f1a\u5bfc\u81f4\u5f02\u5e38\uff1f\u300b<\/span>\u540e\uff0c\u80fd\u591f\u771f\u7684\u5e2e\u52a9\u5230\u5927\u5bb6\u3002\u6211\u4e5f\u4f1a\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\uff0c\u9646\u7eed\u66f4\u65b0\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u6280\u672f\u6587\u7ae0\uff0c\u6709\u597d\u7684\u5efa\u8bae\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u975e\u5e38\u611f\u8c22\uff01<\/p>\n

<\/p>\n

\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61 \u89e6\u53d1__del__\u65b9\u6cd5\u5bfc\u81f4\u5f02\u5e38<\/strong><\/p>\n

python\u5783\u573e\u56de\u6536\u673a\u5236\u4f1a\u81ea\u52a8\u8c03\u7528\u5bf9\u8c61\u7684__del__\u65b9\u6cd5\u8fdb\u884c\u6e05\u7406\uff0c\u4f46\u662f\u5728\u5faa\u73af\u5f15\u7528\u6216\u662f\u5176\u4ed6\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u53ef\u80fd\u5728\u4e0d\u540c\u7684\u987a\u5e8f\u548c\u65f6\u95f4\u70b9\u88ab\u89e6\u53d1\u3002<\/p>\n

\u6848\u4f8b\u4ee3\u7801<\/strong><\/p>\n

import socket\nimport pymysql\n\nclass mydb(object):\n    def __init__(self, name):\n        self.conn = pymysql.connect()\n        self.cursor = self.conn.cursor()\n        print(name, '\u521d\u59cb\u5316\u4e86mydb\u7c7b')\n    def __del__(self):\n        print('\u9500\u6bc1\u8fde\u63a5', self.name)\n        self.cursor.close()\n        self.conn.close()\n    def query(str) -> str | int | exception:\n        pass\n    def add(str) -> int | str | exception:\n        pass\n\nclass socketsetting(object):\n    def __init__(self, name):\n        print(name)\n        self.db = mydb(name)\n\nclass myoption(object):\n    def __init__(self, name):\n        self.socket = socketsetting(name)\n\nclass run(object):\n    def __init__(self):\n        self.setting = socketsetting('setting1')\n        self.setting = socketsetting('setting2')\n        self.setting = socketsetting('setting3')\n\nif __name__ == '__main__':\n    run = run()<\/pre>\n
\u5f02\u5e38\u539f\u56e0<\/strong><\/p>\n
run\u7c7b\u5b9e\u4f8b\u5316\u8fc7\u7a0b\u4e2d\uff0csetting1\u3001setting2\u548csetting3\u4f1a\u8986\u76d6\u524d\u9762\u5efa\u7acb\u7684\u5bf9\u8c61\uff0c\u5bfc\u81f4\u524d\u9762\u5bf9\u8c61\u65e0\u6cd5\u8bbf\u95ee\uff0c\u89e6\u53d1__del__\u65b9\u6cd5\u3002<\/p>\n
\u5f53setting1\u5bf9\u8c61\u88ab\u5783\u573e\u56de\u6536\u65f6\uff0c\u4f1a\u5173\u95ed\u6570\u636e\u5e93\u8fde\u63a5\u3002\u968f\u540e\u521b\u5efasetting2\u5bf9\u8c61\uff0c\u518d\u6b21\u89e6\u53d1__del__\u65b9\u6cd5\uff0c\u6b64\u65f6self.cursor\u548cself.conn\u5df2\u7ecf\u88ab\u5173\u95ed\uff0c\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n
\u89e3\u51b3\u65b9\u6848<\/strong><\/p>\n
\u5728socketsetting\u7c7b\u7684__del__\u65b9\u6cd5\u4e2d\uff0c\u6dfb\u52a0\u5bf9self.db\u7684\u5224\u65ad\uff0c\u4fdd\u8bc1\u5728\u8c03\u7528\u6b64\u65b9\u6cd5\u65f6\uff0c\u6570\u636e\u5e93\u8fde\u63a5\u662f\u6709\u6548\u7684\u3002<\/p>\n
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
\u4f18\u5316\u5efa\u8bae<\/strong><\/p>\n
\u907f\u514d\u5728__del__\u65b9\u6cd5\u4e2d\u8fdb\u884c\u590d\u6742\u64cd\u4f5c\uff0c\u5e94\u5728\u4ee3\u7801\u4e2d\u663e\u5f0f\u5730\u5173\u95ed\u6570\u636e\u5e93\u8fde\u63a5\u6216\u4f7f\u7528with\u8bed\u53e5\u7ba1\u7406\u6570\u636e\u5e93\u8fde\u63a5\u7684\u751f\u547d\u5468\u671f\u3002<\/p>\n
\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aPython \u5783\u573e\u56de\u6536\u673a\u5236\u4e2d\uff0c\u91cd\u590d\u5b9e\u4f8b\u5316\u5bf9\u8c61\u4f1a\u89e6\u53d1__del__\u65b9\u6cd5\uff0c\u4e3a\u4ec0\u4e48\u8fd9\u4f1a\u5bfc\u81f4\u5f02\u5e38\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":"
Python \u5783\u573e\u56de\u6536\u673a\u5236\u4e2d\uff0c\u91cd...<\/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-204559","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204559","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=204559"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204559\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=204559"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=204559"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=204559"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}