{"id":828,"date":"2017-07-29T09:53:14","date_gmt":"2017-07-29T01:53:14","guid":{"rendered":"http:\/\/www.5x44.cn\/?p=828"},"modified":"2017-07-29T09:53:14","modified_gmt":"2017-07-29T01:53:14","slug":"python3%e7%bb%a7%e6%89%bf","status":"publish","type":"post","link":"https:\/\/www.5x44.cn\/?p=828","title":{"rendered":"python3\u7ee7\u627f"},"content":{"rendered":"<p>python3\u7684\u7ee7\u627f\u8bed\u6cd5\uff1a<br \/>\n<code><br \/>\nclass DerivedClassName(BaseClassName):<\/code><\/p>\n<pre>    <span class=\"o\">&lt;<\/span><span class=\"n\">statement<\/span><span class=\"o\">-<\/span><span class=\"mi\">1<\/span><span class=\"o\">&gt;<\/span>\r\n    <span class=\"o\">.<\/span>\r\n    <span class=\"o\">.<\/span>\r\n    <span class=\"o\">.<\/span>\r\n    <span class=\"o\">&lt;<\/span><span class=\"n\">statement<\/span><span class=\"o\">-<\/span><span class=\"n\">N<\/span><span class=\"o\">&gt;<\/span><\/pre>\n<p>BaseClassName\u5fc5\u987b\u548cDerivedClassName\u5728\u540c\u4e00\u4e2a\u533a\u57df\u3002\u5982\u679c\u57fa\u7c7b\u5728\u53e6\u4e00\u4e2a\u6a21\u4e2d\uff0c\u53ef\u4ee5\u5199\u6210\uff1a<\/p>\n<pre><span class=\"k\">class<\/span> <span class=\"nc\">DerivedClassName<\/span><span class=\"p\">(<\/span><span class=\"n\">modname<\/span><span class=\"o\">.<\/span><span class=\"n\">BaseClassName<\/span><span class=\"p\">):<\/span><\/pre>\n<p>\u6d3e\u751f\u7c7b\u7684\u6267\u884c\u8fc7\u7a0b\u548c\u57fa\u7c7b\u7c7b\u4f3c\u3002\u5f53\u7c7b\u5bf9\u8c61\u88ab\u5efa\u7acb\u65f6\uff0c\u57fa\u7c7b\u5148\u88ab\u4f7f\u7528\u3002\u8fd9\u7528\u4e8e\u89e3\u6790\u5c5e\u6027\u7d22\u5f15\uff1a\u5982\u679c\u4e00\u4e2a\u88ab\u8bf7\u6c42\u7684\u5c5e\u6027\u4e0d\u5728\u5f53\u524d\u7c7b\u4e2d\uff0c\u90a3\u4e48\u4f1a\u53bb\u641c\u7d22\u5b83\u7684\u57fa\u7c7b\u3002\u5982\u679c\u7c7b\u662f\u7531\u5176\u5b83\u7c7b\u6d3e\u751f\u800c\u6765\u7684\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u88ab\u9012\u5f52\u5e94\u7528\u3002<\/p>\n<p>\u6d3e\u751f\u7c7b\u7684\u5b9e\u4f8b\u6ca1\u6709\u4efb\u4f55\u7279\u6b8a\u6743\u9650\uff1a<code>DerivedClassName()<\/code>\u521b\u5efa\u4e00\u4e2a\u7c7b\u5b9e\u4f8b\u3002\u65b9\u6cd5\u7684\u7d22\u5f15\u89e3\u6790\u5982\u4e0b\uff1a\u76f8\u5e94\u7684\u7c7b\u5c5e\u6027\u88ab\u67e5\u627e\uff0c\u6cbf\u7740\u57fa\u7c7b\u7684\u6d3e\u751f\u94fe\u5411\u4e0b\u67e5\u627e\uff08the corresponding class attribute is searched, descending down the chain of base classes if necessary\uff09\uff0c\u5982\u679c\u4ea7\u751f\u4e86\u51fd\u6570\u5bf9\u8c61\uff0c\u65b9\u6cd5\u7d22\u5f15\u4e5f\u9002\u7528\u3002<\/p>\n<p>\u6d3e\u751f\u7c7b\u53ef\u4ee5\u91cd\u5199\u5b83\u4eec\u7684\u57fa\u7c7b\u65b9\u6cd5\u3002\u56e0\u4e3a\u5f53\u5728\u540c\u4e00\u4e2a\u5bf9\u8c61\u4e2d\u8c03\u7528\u5176\u5b83\u65b9\u6cd5\u65f6\u662f\u6ca1\u6709\u7279\u6b8a\u6743\u9650\u7684\uff0c\u4e00\u4e2a\u57fa\u7c7b\u65b9\u6cd5\u8c03\u7528\u53e6\u4e00\u4e2a\u5b9a\u4e49\u5728\u540c\u4e00\u57fa\u7c7b\u7684\u65b9\u6cd5\uff0c\u53ef\u80fd\u8c03\u7528\u8be5\u7c7b\u7684\u6d3e\u751f\u7c7b\u7684\u91cd\u5199\u65b9\u6cd5\u3002\uff08\u4eceC++\u7684\u89d2\u5ea6\u770bpython\u7684\u6240\u6709\u65b9\u6cd5\u90fd\u662f<code>virtual<\/code>\u7684\uff09<\/p>\n<p>\u6d3e\u751f\u7c7b\u4e2d\u91cd\u5199\u7684\u57fa\u7c7b\u65b9\u6cd5\u5b9e\u9645\u4e0a\u4e0d\u4ec5\u4ec5\u662f\u66ff\u6362\u57fa\u7c7b\u65b9\u6cd5\uff0c\u5b83\u8fd8\u53ef\u4ee5\u6269\u5c55\u57fa\u7c7b\u65b9\u6cd5\u7684\u529f\u80fd\u3002\u8fd9\u6709\u4e00\u79cd\u76f4\u63a5\u8c03\u7528\u57fa\u7c7b\u65b9\u6cd5\u7684\u7b80\u5355\u65b9\u5f0f\uff1a\u4ec5\u4ec5\u8c03\u7528<code>BaseClassName.methodname(self,arguments)<\/code>\u3002\u8fd9\u6709\u65f6\u5bf9\u5ba2\u6237\u5f88\u6709\u7528\u3002\uff08\u6ce8\u610f\uff1a\u8fd9\u4ec5\u5bf9\u57fa\u7c7b\u662f\u5728\u5168\u5c40\u533a\u57df\u53ef\u89c1\u7684\u65f6\u5019\u53ef\u7528\uff09<\/p>\n<p>python\u6709\u4e24\u4e2a\u5185\u5efa\u51fd\u6570\u7528\u4e8e\u7ee7\u627f\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528<span style=\"color: #00ccff;\">isinstance()<\/span>\u68c0\u67e5\u4e00\u4e2a\u5b9e\u4f8b\u7684\u7c7b\u578b\uff1a<code>isinstance(obj,int)<\/code>\uff0c\u5982\u679cobj.__class__\u662f<span style=\"color: #00ccff;\">int<\/span>\u6216\u662f\u5176\u5b83\u7c7b\u4ece<span style=\"color: #00ccff;\">int<\/span>\u6d3e\u751f\u800c\u6765\u7684\uff0c\u8fd4\u56deTrue.<\/li>\n<li>\u4f7f\u7528<span style=\"color: #00ccff;\">issubclass()<\/span>\u68c0\u67e5\u4e00\u4e2a\u7c7b\u7684\u7ee7\u627f\uff1a<code>issubclass(bool,int)<\/code>\uff0c\u56e0\u4e3a<span style=\"color: #00ccff;\">bool<\/span>\u662f<span style=\"color: #00ccff;\">int<\/span>\u7684\u5b50\u7c7b\uff0c\u6240\u4ee5\u8fd4\u56deTrue\u3002\u4f46\u662f<code>issubclass(float, int)<\/code>\u8fd4\u56deFalse\uff0c\u56e0\u4e3a<span style=\"color: #00ccff;\">float<\/span>\u4e0d\u662f<span style=\"color: #00ccff;\">int<\/span>\u7684\u5b50\u7c7b\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>python3\u7684\u7ee7\u627f\u8bed\u6cd5\uff1a class DerivedClassName(BaseClassName): &lt;statement-1&gt; . . . &#038;&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"https:\/\/www.5x44.cn\/?p=828\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[36],"class_list":["post-828","post","type-post","status-publish","format-standard","hentry","category-python3","tag-36"],"_links":{"self":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/828","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=828"}],"version-history":[{"count":2,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/828\/revisions"}],"predecessor-version":[{"id":830,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/828\/revisions\/830"}],"wp:attachment":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=828"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=828"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=828"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}