{"id":8827,"date":"2023-08-11T17:58:32","date_gmt":"2023-08-11T09:58:32","guid":{"rendered":"\/?p=8827"},"modified":"2023-09-20T16:39:55","modified_gmt":"2023-09-20T08:39:55","slug":"python%e5%ae%9e%e7%8e%b0%e5%8d%95%e4%be%8b%e6%a8%a1%e5%bc%8f%e7%9a%84%e5%87%a0%e7%a7%8d%e6%96%b9%e6%b3%95%e5%ae%9e%e4%be%8b%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"\/?p=8827","title":{"rendered":"python\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u7684\u51e0\u79cd\u65b9\u6cd5\u5b9e\u4f8b\u8be6\u89e3"},"content":{"rendered":"<h2>\u5355\u4f8b\u6a21\u5f0f\uff08Singleton Pattern\uff09\uff1a<\/h2>\n<p>\u662f\u4e00\u79cd\u5e38\u7528\u7684\u8f6f\u4ef6\u8bbe\u8ba1\u6a21\u5f0f\uff0c\u8be5\u6a21\u5f0f\u7684\u4e3b\u8981\u76ee\u7684\u662f\u786e\u4fdd\u67d0\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\u5b58\u5728\u3002\u5f53\u4f60\u5e0c\u671b\u5728\u6574\u4e2a\u7cfb\u7edf\u4e2d\uff0c\u67d0\u4e2a\u7c7b\u53ea\u80fd\u51fa\u73b0\u4e00\u4e2a\u5b9e\u4f8b\u65f6\uff0c\u5355\u4f8b\u5bf9\u8c61\u5c31\u80fd\u6d3e\u4e0a\u7528\u573a\u3002<\/p>\n<h2>\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u7b2c\u4e00\u79cd\u65b9\u6cd5\uff1a<\/h2>\n<p>1.\u5b9e\u4f8b\u5316\u4e00\u4e2a\u7684\u5bf9\u8c61\uff0c\u8981\u7528\u65f6\u76f4\u63a5import\u5bfc\u5982\u8fd9\u4e2a\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u518d\u5b9e\u4f8b\u5316\u4e00\u4e2a\uff0c\u8fd9\u6837\u5c31\u505a\u5230\u4e86\u5355\u4f8b\u6a21\u5f0f\u4e86\uff0c\u6bcf\u6b21\u90fd\u7528\u7684\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6b64\u5904\u5c31\u4e0d\u4e3e\u4f8b\u4e86\uff1b<\/p>\n<h2>\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u7b2c\u4e8c\u79cd\u65b9\u6cd5\uff1a<\/h2>\n<p>2.\u6211\u4eec\u77e5\u9053\uff0c\u5f53\u6211\u4eec\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u662f\u5148\u6267\u884c\u4e86\u7c7b\u7684<strong>new<\/strong>\u65b9\u6cd5\uff08\u6211\u4eec\u6ca1\u5199\u65f6\uff0c\u9ed8\u8ba4\u8c03\u7528object.new\uff09\uff0c\u5b9e\u4f8b\u5316\u5bf9\u8c61\uff1b\u7136\u540e\u518d\u6267\u884c\u7c7b\u7684<strong>init<\/strong>\u65b9\u6cd5\uff0c\u5bf9\u8fd9\u4e2a\u5bf9\u8c61\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u6240\u6709\u6211\u4eec\u53ef\u4ee5\u57fa\u4e8e\u8fd9\u4e2a\uff0c\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u3002<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBA6ams5YS_5LiN5Lya6LeR,size_20,color_FFFFFF,t_70,g_se,x_16.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u7ed3\u679c\uff1a<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/7a254d7dde5f4a15821dafef2b109f0e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4ece\u4ee5\u4e0a\u7ed3\u679c\u4e2d\u6211\u4eec\u770b\u5230\uff0c\u4f7f\u7528\u7c7b\u521b\u5efa\u5bf9\u8c61\u65f6\uff0c\u5148\u81ea\u52a8\u6267\u884c\u4e86new\u65b9\u6cd5\u521b\u5efa\u5bf9\u8c61\uff0c\u7136\u540e\u8fd4\u56de\u7ed9init\u8fdb\u884c\u521d\u59cb\u5316\u64cd\u4f5c\uff1b<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBA6ams5YS_5LiN5Lya6LeR,size_20,color_FFFFFF,t_70,g_se,x_16-1691747796440-9.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/683a9f555c534aa683687deff4c33da4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4ee5\u4e0a\uff0c\u901a\u8fc7new\u65b9\u6cd5\u5185\u5224\u65ad\u662f\u5426\u521b\u5efa\u8fc7\u5bf9\u8c61\uff0c\u6765\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\uff0c\u6211\u4eec\u5b9e\u4f8b\u5316\u4e09\u4e2a\u5bf9\u8c61t1,t2,t3\u4e09\u4e2a\u5bf9\u8c61\u5185\u5b58\u5730\u5740\u90fd\u662f\u4e00\u6837\u7684\uff0c\u8fd9\u5c31\u8bf4\u660e\u4ed6\u4eec\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002<\/p>\n<h2>\u5355\u4f8b\u6a21\u5f0f\u7684\u7b2c\u4e09\u79cd\u65b9\u6cd5<\/h2>\n<p>\u901a\u8fc7\u88c5\u9970\u5668\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\uff1a<br \/>\n\u4efb\u610f\u4e00\u4e2a\u7c7b\u4f7f\u7528\u4e86\u8be5\u88c5\u9970\u5668\u5c31\u4f1a\u53d8\u6210\u4e00\u4e2a\u5355\u4f8b\u6a21\u5f0f\u7684\u7c7b\uff1b<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBA6ams5YS_5LiN5Lya6LeR,size_20,color_FFFFFF,t_70,g_se,x_16-1691747817441-14.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u7ed3\u679c\uff1a<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/1f506b1f6152469385e236f261d48c0f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4ee5\u4e0a\uff0c\u6211\u4eec\u5199\u4e86\u4e00\u4e2a\u88c5\u9970\u5668\uff0c\u8be5\u88c5\u9970\u5668\u5c06\u6240\u6709\u7684\u5bf9\u8c61\u90fd\u5b58\u50a8\u5230\u5b57\u5178\u91cc\uff0c\u5982\u679c\u4e4b\u524d\u521b\u5efa\u8fc7\u7684\u5bf9\u8c61\u5c31\u76f4\u63a5\u8fd4\u56de\uff0c\u5982\u679c\u6ca1\u6709\u521b\u5efa\u8fc7\u7684\u5bf9\u8c61\u90a3\u5c31new\u4e00\u4e2a\uff0c\u540c\u4e00\u4e2a\u7c7b\u6211\u4eec\u5b9e\u4f8b\u5316\u4e86t1\u548ct2\uff0c\u4f46\u662f\u4ed6\u4eec\u7684\u5185\u5b58\u5730\u5740\u90fd\u662f\u540c\u4e00\u4e2a\uff0c\u8bf4\u660e\u6211\u4eec\u5df2\u7ecf\u5b9e\u73b0\u4e86\u5355\u4f8b\u6a21\u5f0f\u7684\u7c7b\u88c5\u9970\u5668\uff1b<\/p>\n<pre><code class=\"language-python\">def Single_Class(cls):\n    instance = {}  # \u7528\u4e00\u4e2a\u5b57\u5178\u6765\u5b58\u50a8\u7c7b\u5bf9\u8c61\n\n    def single(*args, **kwargs):\n        if cls not in instance:\n            instance[cls] = cls(*args, **kwargs)  # \u5982\u679c\u7c7b\u6ca1\u521b\u5efa\u8fc7\uff0c\u90a3\u5c31new\u4e00\u4e2a\uff0c\u4fdd\u5b58\u5728\u5b57\u5178\u4e2d\n            return instance[cls]\n        else:\n            return instance[cls]\n\n    return single<\/code><\/pre>\n<p>\u5355\u4f8b\u6a21\u5f0f\u7684\u4f18\u70b9\uff1a<br \/>\n1.\u8282\u7ea6\u5185\u5b58\uff0c\u56e0\u4e3a\u4e0d\u7ba1\u5b9e\u4f8b\u5316\u591a\u5c11\u4e2a \u5bf9\u8c61\u90fd\u5b9e\u9645\u6307\u5411\u4e00\u4e2a\u5185\u5b58\u5730\u5740\uff1b<br \/>\n2.\u591a\u4e2a\u5730\u65b9\u521b\u5efa\u7684\u5b9e\u4f8b\u4ed6\u4eec\u7684\u5c5e\u6027\u4e92\u52a8\uff0c\u5982\u4e0b\u4f8b\u5b50\uff1a\u6211\u4eec\u53ea\u7ed9\u5b9e\u4f8b\u5316\u5bf9\u8c61t1\u6dfb\u52a0\u4e86\u4e00\u4e2aname\u5c5e\u6027\uff0c\u800ct2\u548ct3\u90fd\u62e5\u6709\u4e86\u8fd9\u4e2a\u5c5e\u6027\uff0c\u8fd9\u5c31\u7ed9\u6211\u4eec\u8282\u7ea6\u4e86\u5f88\u591a\u7684\u65f6\u95f4\uff1b<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/img\/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBA6ams5YS_5LiN5Lya6LeR,size_20,color_FFFFFF,t_70,g_se,x_16-1691747841964-19.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5355\u4f8b\u6a21\u5f0f\uff08Singleton Pattern\uff09\uff1a \u662f\u4e00\u79cd\u5e38\u7528\u7684\u8f6f\u4ef6\u8bbe\u8ba1\u6a21\u5f0f\uff0c\u8be5\u6a21\u5f0f\u7684\u4e3b\u8981\u76ee\u7684\u662f\u786e\u4fdd\u67d0\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\u5b58\u5728\u3002\u5f53\u4f60\u5e0c\u671b\u5728\u6574   \u2026 &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[34],"tags":[],"_links":{"self":[{"href":"\/index.php?rest_route=\/wp\/v2\/posts\/8827"}],"collection":[{"href":"\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8827"}],"version-history":[{"count":2,"href":"\/index.php?rest_route=\/wp\/v2\/posts\/8827\/revisions"}],"predecessor-version":[{"id":8988,"href":"\/index.php?rest_route=\/wp\/v2\/posts\/8827\/revisions\/8988"}],"wp:attachment":[{"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8827"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8827"},{"taxonomy":"post_tag","embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8827"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}