{"id":41740,"date":"2023-12-11T14:54:26","date_gmt":"2023-12-11T06:54:26","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=41740"},"modified":"2023-12-11T14:54:26","modified_gmt":"2023-12-11T06:54:26","slug":"metaclass%e4%bd%9c%e7%94%a8%ef%bc%9f%e4%bb%a5%e5%8f%8a%e5%ba%94%e7%94%a8%e5%9c%ba%e6%99%af%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/metaclass%e4%bd%9c%e7%94%a8%ef%bc%9f%e4%bb%a5%e5%8f%8a%e5%ba%94%e7%94%a8%e5%9c%ba%e6%99%af%ef%bc%9f\/","title":{"rendered":"metaclass\u4f5c\u7528\uff1f\u4ee5\u53ca\u5e94\u7528\u573a\u666f\uff1f"},"content":{"rendered":"

“`” metaclass\u7528\u6765\u6307\u5b9a\u7c7b\u662f\u7531\u8c01\u521b\u5efa\u7684\u3002<\/p>\n

\u7c7b\u7684metaclass \u9ed8\u8ba4\u662ftype\u3002\u6211\u4eec\u4e5f\u53ef\u4ee5\u6307\u5b9a\u7c7b\u7684metaclass\u503c\u3002\u5728python3\u4e2d<\/p>\n

<pre><code>class MyType(type):
\n def __call__(self, *args, **kwargs):
\n return 'MyType'<\/p>\n

class Foo(object, metaclass=MyType):
\n def __init__(self):
\n return 'init'<\/p>\n

def __new__(cls, *args, **kwargs):
\n return cls.__init__(cls)<\/p>\n

def __call__(self, *args, **kwargs):
\n return 'call'<\/p>\n

obj = Foo()
\nprint(obj) # MyType
\n<\/code><\/pre><\/p>\n

\u00a0<\/p>\n

<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/images2018.cnblogs.com\/blog\/1258691\/201805\/1258691-20180524152039412-696009410.png""><\/p>\n

\u00a0<\/p>\n

<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"

“`” metaclass\u7528\u6765\u6307\u5b9a\u7c7b\u662f\u7531\u8c01\u521b\u5efa\u7684\u3002 \u7c7b\u7684metaclass \u9ed8\u8ba4\u662fty […]<\/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-41740","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/41740","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=41740"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/41740\/revisions"}],"predecessor-version":[{"id":41741,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/41740\/revisions\/41741"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=41740"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=41740"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=41740"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}