{"id":41742,"date":"2023-12-11T14:54:27","date_gmt":"2023-12-11T06:54:27","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=41742"},"modified":"2023-12-11T14:54:27","modified_gmt":"2023-12-11T06:54:27","slug":"%e7%94%a8%e5%b0%bd%e9%87%8f%e5%a4%9a%e7%9a%84%e6%96%b9%e6%b3%95%e5%ae%9e%e7%8e%b0%e5%8d%95%e4%be%8b%e6%a8%a1%e5%bc%8f%e3%80%82","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/%e7%94%a8%e5%b0%bd%e9%87%8f%e5%a4%9a%e7%9a%84%e6%96%b9%e6%b3%95%e5%ae%9e%e7%8e%b0%e5%8d%95%e4%be%8b%e6%a8%a1%e5%bc%8f%e3%80%82\/","title":{"rendered":"\u7528\u5c3d\u91cf\u591a\u7684\u65b9\u6cd5\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u3002"},"content":{"rendered":"<p>&#8220;`&#8221;<\/p>\n<p>&lt;pre&gt;&lt;code&gt;1\uff1a\u4f7f\u7528\u6a21\u5757<br \/>\nPython\u7684\u6a21\u5757\u5c31\u662f\u5929\u7136\u7684\u5355\u4f8b\u6a21\u5f0f\u3002<br \/>\n\u56e0\u4e3a\u6a21\u5757\u5728\u7b2c\u4e00\u6b21\u5bfc\u5165\u65f6\uff0c\u4f1a\u751f\u6210 .pyc \u6587\u4ef6\uff0c\u5f53\u7b2c\u4e8c\u6b21\u5bfc\u5165\u65f6\uff0c\u5c31\u4f1a\u76f4\u63a5\u52a0\u8f7d .pyc \u6587\u4ef6\uff0c\u800c\u4e0d\u4f1a\u518d\u6b21\u6267\u884c\u6a21\u5757\u4ee3\u7801\u3002<br \/>\n\u56e0\u6b64\uff0c\u6211\u4eec\u53ea\u9700\u628a\u76f8\u5173\u7684\u51fd\u6570\u548c\u6570\u636e\u5b9a\u4e49\u5728\u4e00\u4e2a\u6a21\u5757\u4e2d\uff0c\u5c31\u53ef\u4ee5\u83b7\u5f97\u4e00\u4e2a\u5355\u4f8b\u5bf9\u8c61\u4e86\u3002<br \/>\n\u4f8b\u5982\uff1a<br \/>\nclass V1(object):<br \/>\n    def foo(self)<br \/>\n        pass<br \/>\nV1 = V1()<br \/>\n\u5c06\u4e0a\u9762\u4ee3\u7801\u4fdd\u5b58\u5728\u6587\u4ef6test.py,\u8981\u4f7f\u7528\u65f6\uff0c\u76f4\u63a5\u5728\u5176\u4ed6\u6587\u4ef6\u4e2d\u5bfc\u5165\u6b64\u6587\u4ef6\u4e2d\u7684\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u65e2\u662f\u5355\u4f8b\u6a21\u5f0f\u7684\u5bf9\u8c61<\/p>\n<p>\u5982\uff1afrom a import V1<\/p>\n<p>2\uff1a\u4f7f\u7528\u88c5\u9970\u5668<br \/>\ndef Singleton(cls):<br \/>\n    _instance = {}<br \/>\n    def _singleton(*args, **kargs):<br \/>\n        if cls not in _instance:<br \/>\n            _instance[cls] = cls(*args, **kargs)<br \/>\n        return _instance[cls]<br \/>\n    return _singleton<br \/>\n@Singleton<br \/>\nclass A(object):<br \/>\n    a = 1<br \/>\n    def __init__(self, x=0):<br \/>\n        self.x = x<br \/>\na1 = A(2)<br \/>\na2 = A(3)<\/p>\n<p>3\uff1a\u4f7f\u7528\u7c7b<\/p>\n<p>4\uff1a\u57fa\u4e8e__new__\u65b9\u6cd5\u5b9e\u73b0<br \/>\n\u5f53\u6211\u4eec\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u662f\u5148\u6267\u884c\u4e86\u7c7b\u7684__new__\u65b9\u6cd5<br \/>\n\u5f53\uff1a\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__init__\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<br \/>\n&lt;\/code&gt;&lt;\/pre&gt;<\/p>\n<p>&lt;pre&gt;&lt;code&gt;            &quot;&#8220;`<br \/>\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;`&#8221; &lt;pre&gt;&lt;code&gt;1\uff1a\u4f7f\u7528\u6a21\u5757 Python\u7684\u6a21\u5757 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-41742","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/41742","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=41742"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/41742\/revisions"}],"predecessor-version":[{"id":41743,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/41742\/revisions\/41743"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=41742"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=41742"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=41742"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}