{"id":92441,"date":"2026-08-10T11:16:46","date_gmt":"2026-08-10T03:16:46","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/92441.html"},"modified":"2026-08-10T11:16:46","modified_gmt":"2026-08-10T03:16:46","slug":"python-%e4%b8%89-%e5%9b%9b-4-%e7%b1%bb%e3%80%81%e5%af%b9%e8%b1%a1%e4%b8%8e%e9%ad%94%e6%9c%af%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/92441.html","title":{"rendered":"Python.\u4e09.(\u56db)--4.\u7c7b\u3001\u5bf9\u8c61\u4e0e\u9b54\u672f\u65b9\u6cd5"},"content":{"rendered":"<h3>\u4e09\u3001 \u51fd\u6570\u3001\u7c7b\u4e0e\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b (OOP)<\/h3>\n<ul>\n<li>\u6807\u9898&#xff1a;\n<p>&lt;ol&gt;<br \/>\n&lt;li&gt;\u51fd\u6570\u53c2\u6570\u4e0e\u9ad8\u9636\u51fd\u6570&lt;\/li&gt;<br \/>\n&lt;li&gt;\u88c5\u9970\u5668\u4e0e\u95ed\u5305&lt;\/li&gt;<br \/>\n&lt;li&gt;\u9762\u5411\u5bf9\u8c61\u4e09\u5927\u7279\u5f81&lt;\/li&gt;<br \/>\n&lt;li&gt;\u7c7b\u3001\u5bf9\u8c61\u4e0e\u9b54\u672f\u65b9\u6cd5&lt;\/li&gt;<br \/>\n&lt;li&gt;\u5f02\u5e38\u5904\u7406&lt;\/li&gt;<br \/>\n&lt;\/ol&gt;<br \/>\n&lt;\/li&gt;<\/p>\n<\/li>\n<\/ul>\n<h4>\u8fd98\u4e2a\u77e5\u8bc6\u70b9\u5171\u540c\u6784\u6210&#034;Python\u5bf9\u8c61\u6a21\u578b\u7684\u5b8c\u6574\u56fe\u8c31&#034;&#xff1a;\u4ece\u5bf9\u8c61\u7684\u521b\u5efa\u3001\u884c\u4e3a\u3001\u81ea\u7701&#xff0c;\u5230\u5143\u5c42\u7684\u63a7\u5236&#xff0c;\u73af\u73af\u76f8\u6263<\/h4>\n<p>&#x1f3a8; \u6838\u5fc3\u903b\u8f91\u94fe&#xff1a;\u5143\u7c7b\u9020\u7c7b \u2192 \u7c7b\u9020\u5bf9\u8c61 \u2192 \u9b54\u672f\u65b9\u6cd5\u5b9a\u4e49\u5bf9\u8c61\u884c\u4e3a \u2192 \u81ea\u7701\u8ba9\u6211\u4eec\u89c2\u5bdf\u8fd9\u4e00\u5207 \u2192 \u65b9\u6cd5\/\u53d8\u91cf\/\u63a7\u5236\u6d41\u662f\u65e5\u5e38\u4f7f\u7528\u7ec6\u8282\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u9010\u70b9\u901f\u89c8<\/h3>\n<p>\u2460 \u81ea\u7701&#xff08;Introspection&#xff09; &#x1f50d;<br \/>\n\u5bf9\u8c61\u5728\u8fd0\u884c\u65f6&#034;\u81ea\u6211\u5ba1\u89c6&#034;\u7684\u80fd\u529b\u3002\u901a\u8fc7 type()\u3001dir()\u3001hasattr()\u3001getattr()\u3001inspect \u7b49\u83b7\u53d6\u5bf9\u8c61\u7684\u7c7b\u578b\u3001\u5c5e\u6027\u3001\u65b9\u6cd5\u3002<\/p>\n<p>class A: pass<br \/>\na &#061; A()<br \/>\nprint(dir(a))          # \u67e5\u770b\u6240\u6709\u5c5e\u6027\u65b9\u6cd5<br \/>\nprint(type(a))         # &lt;class &#039;__main__.A&#039;&gt;<br \/>\ngetattr(a, &#039;x&#039;, None)  # \u5b89\u5168\u53d6\u5c5e\u6027<\/p>\n<p>\u2461 \u5b9e\u4f8b\u65b9\u6cd5 \/ \u7c7b\u65b9\u6cd5 \/ \u9759\u6001\u65b9\u6cd5 \u2696\ufe0f<\/p>\n<table>\n<tr>\u7c7b\u578b\u88c5\u9970\u5668\u9996\u53c2\u80fd\u5426\u8bbf\u95ee\u5b9e\u4f8b\u80fd\u5426\u8bbf\u95ee\u7c7b<\/tr>\n<tbody>\n<tr>\n<td>\u5b9e\u4f8b\u65b9\u6cd5<\/td>\n<td>\u65e0<\/td>\n<td>self<\/td>\n<td>\u2705<\/td>\n<td>\u2705<\/td>\n<\/tr>\n<tr>\n<td>\u7c7b\u65b9\u6cd5<\/td>\n<td>&#064;classmethod<\/td>\n<td>cls<\/td>\n<td>\u274c<\/td>\n<td>\u2705<\/td>\n<\/tr>\n<tr>\n<td>\u9759\u6001\u65b9\u6cd5<\/td>\n<td>&#064;staticmethod<\/td>\n<td>\u65e0<\/td>\n<td>\u274c<\/td>\n<td>\u274c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u2462 &#064;staticmethod \/ &#064;classmethod \u4f7f\u7528\u6ce8\u610f \u26a0\ufe0f<\/p>\n<ul>\n<li>&#064;classmethod \u6700\u5e38\u89c1\u7528\u9014&#xff1a;\u66ff\u4ee3\u6784\u9020\u5668&#xff08;from_xxx \u5de5\u5382\u65b9\u6cd5&#xff09;\u3002<\/li>\n<li>&#064;staticmethod \u7528\u4e8e\u903b\u8f91\u4e0a\u5c5e\u4e8e\u7c7b\u4f46\u4e0d\u4f9d\u8d56\u7c7b\/\u5b9e\u4f8b\u72b6\u6001\u7684\u5de5\u5177\u51fd\u6570&#xff1b;\u82e5\u53d1\u73b0\u5b83\u6ca1\u7528\u5230\u7c7b\u4fe1\u606f&#xff0c;\u5176\u5b9e\u53ef\u4ee5\u63d0\u5230\u6a21\u5757\u5c42\u3002<\/li>\n<li>\u6ce8\u610f&#xff1a;\u9759\u6001\u65b9\u6cd5\u65e0\u6cd5\u88ab\u5b50\u7c7b\u591a\u6001\u91cd\u5199\u6539\u53d8\u884c\u4e3a&#xff08;\u5b83\u4e0d\u63a5\u6536 cls&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u2463 \u7c7b\u53d8\u91cf vs \u5b9e\u4f8b\u53d8\u91cf &#x1f4e6;<\/p>\n<ul>\n<li>\u7c7b\u53d8\u91cf&#xff1a;\u5b9a\u4e49\u5728\u7c7b\u4f53\u3001\u65b9\u6cd5\u5916&#xff0c;\u6240\u6709\u5b9e\u4f8b\u5171\u4eab\u3002<\/li>\n<li>\u5b9e\u4f8b\u53d8\u91cf&#xff1a;\u5728 __init__ \u4e2d\u901a\u8fc7 self.xxx \u7ed1\u5b9a&#xff0c;\u5404\u5b9e\u4f8b\u72ec\u6709\u3002<\/li>\n<\/ul>\n<p>class Dog:<br \/>\n    species &#061; &#034;Canis&#034;      # \u7c7b\u53d8\u91cf&#xff08;\u5171\u4eab&#xff09;<br \/>\n    def __init__(self, name):<br \/>\n        self.name &#061; name   # \u5b9e\u4f8b\u53d8\u91cf&#xff08;\u72ec\u6709&#xff09;<\/p>\n<p>\u26a0\ufe0f \u5751&#xff1a;\u7528\u53ef\u53d8\u5bf9\u8c61&#xff08;\u5982 list&#xff09;\u4f5c\u7c7b\u53d8\u91cf\u4f1a\u88ab\u6240\u6709\u5b9e\u4f8b\u5171\u4eab&#xff0c;\u6613\u51fa bug\u3002<\/p>\n<p>\u2464 __new__ vs __init__ &#x1f3d7;\ufe0f<\/p>\n<ul>\n<li>__new__&#xff1a;\u521b\u5efa\u5e76\u8fd4\u56de\u5b9e\u4f8b&#xff0c;\u662f\u7c7b\u65b9\u6cd5&#xff08;\u9996\u53c2 cls&#xff09;&#xff0c;\u5148\u8c03\u7528\u3002\u63a7\u5236\u5bf9\u8c61\u7684\u751f\u6210&#xff08;\u5355\u4f8b\u3001\u4e0d\u53ef\u53d8\u5bf9\u8c61\u7f13\u5b58\u5fc5\u7528&#xff09;\u3002<\/li>\n<li>__init__&#xff1a;\u521d\u59cb\u5316\u5df2\u6709\u5b9e\u4f8b&#xff0c;\u9996\u53c2 self&#xff0c;\u540e\u8c03\u7528\u3002\u8d4b\u503c\u5b9e\u4f8b\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<p>class Singleton:<br \/>\n    _inst &#061; None<br \/>\n    def __new__(cls, *a, **kw):<br \/>\n        if cls._inst is None:<br \/>\n            cls._inst &#061; super().__new__(cls)<br \/>\n        return cls._inst<\/p>\n<p>\u2465 \u9b54\u672f\u65b9\u6cd5&#xff08;Dunder Methods&#xff09; \u2728<br \/>\n\u4ee5\u53cc\u4e0b\u5212\u7ebf\u5305\u88f9\u7684\u65b9\u6cd5&#xff0c;\u7531 Python \u9690\u5f0f\u8c03\u7528&#xff0c;\u5b9e\u73b0\u8fd0\u7b97\u7b26\u91cd\u8f7d\u3001\u534f\u8bae&#xff08;\u8fed\u4ee3\u3001\u4e0a\u4e0b\u6587\u7ba1\u7406\u7b49&#xff09;\u3002\u4f8b&#xff1a;__init__\u3001__str__\u3001__len__\u3001__call__\u3001__getitem__\u3001__enter__\/__exit__\u3002<\/p>\n<p>class Vector:<br \/>\n    def __init__(self, x, y): self.x, self.y &#061; x, y<br \/>\n    def __add__(self, o): return Vector(self.x&#043;o.x, self.y&#043;o.y)  # \u91cd\u8f7d &#043;<\/p>\n<p>\u2466 \u5143\u7c7b&#xff08;Metaclass&#xff09; &#x1f9ec;<br \/>\n&#034;\u7c7b\u7684\u7c7b&#034;\u3002\u666e\u901a\u7c7b\u662f type \u7684\u5b9e\u4f8b&#xff0c;type \u672c\u8eab\u5c31\u662f\u9ed8\u8ba4\u5143\u7c7b\u3002\u5143\u7c7b\u63a7\u5236\u7c7b\u7684\u521b\u5efa\u884c\u4e3a&#xff0c;\u5e38\u7528\u4e8e ORM\u3001\u6846\u67b6\u81ea\u52a8\u6ce8\u518c\u3001\u63a5\u53e3\u6821\u9a8c\u3002<\/p>\n<p>class Meta(type):<br \/>\n    def __new__(mcs, name, bases, ns):<br \/>\n        ns[&#039;created_by&#039;] &#061; &#039;Meta&#039;   # \u62e6\u622a\u5e76\u4fee\u6539\u7c7b\u5b9a\u4e49<br \/>\n        return super().__new__(mcs, name, bases, ns)<br \/>\nclass Foo(metaclass&#061;Meta): pass<br \/>\nprint(Foo.created_by)   # Meta<\/p>\n<p>\u2467 switch-case \u5b9e\u73b0 &#x1f500;<br \/>\nPython 3.10&#043; \u6709\u5b98\u65b9 match-case&#xff1b;\u65e7\u5199\u6cd5\u7528\u5b57\u5178\u6620\u5c04\u6216\u51fd\u6570\u5206\u53d1&#xff08;\u95ed\u5305\/\u65b9\u6cd5\u8868&#xff09;\u3002<\/p>\n<p># \u5b57\u5178\u5206\u53d1<br \/>\ndef op(x, y, code):<br \/>\n    return {&#039;add&#039;: lambda: x&#043;y, &#039;sub&#039;: lambda: x-y}.get(code, lambda: None)()<br \/>\nmatch-case (3.10&#043;)<br \/>\nmatch code:<br \/>\ncase &#039;add&#039;: print(x&#043;y)<br \/>\ncase &#039;sub&#039;: print(x-y)<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u5b83\u4eec\u4e4b\u95f4\u7684\u8054\u7cfb &#x1f517;<\/h3>\n<p>\u8fd9\u662f\u6838\u5fc3\u30028\u4e2a\u70b9\u53ef\u5f52\u4e3a\u56db\u4e2a\u5c42\u6b21&#xff0c;\u5c42\u5c42\u9012\u8fdb&#xff1a;<\/p>\n<p>&#x1f9ec; \u5143\u5c42: \u5143\u7c7b metaclass<br \/>\n\u63a7\u5236&#034;\u7c7b&#034;\u5982\u4f55\u88ab\u521b\u5efa<\/p>\n<p>&#x1f3d7;\ufe0f \u521b\u5efa\u5c42: __new__ \u9020\u5bf9\u8c61 \u2192 __init__ \u521d\u59cb\u5316<br \/>\n\u7c7b\u53d8\u91cf\/\u5b9e\u4f8b\u53d8\u91cf \u5728\u6b64\u7ed1\u5b9a<\/p>\n<p>\u2728 \u884c\u4e3a\u5c42: \u9b54\u672f\u65b9\u6cd5\u5b9a\u4e49\u5bf9\u8c61\u884c\u4e3a<br \/>\n&#064;classmethod\/&#064;staticmethod \u5b9a\u4e49\u65b9\u6cd5\u8bed\u4e49<\/p>\n<p>&#x1f50d; \u4f7f\u7528\u5c42: \u81ea\u7701\u89c2\u5bdf\u4e00\u5207<br \/>\nswitch-case \u505a\u8fd0\u884c\u65f6\u5206\u53d1<\/p>\n<p>1. \u5143\u7c7b \u2192 __new__\/__init__ \u2192 \u9b54\u672f\u65b9\u6cd5&#xff08;\u521b\u5efa\u94fe&#xff09;<br \/>\n\u5143\u7c7b\u7684 __new__ \u521b\u5efa&#034;\u7c7b&#034;\u8fd9\u4e2a\u5bf9\u8c61&#xff1b;\u800c\u5f53\u6211\u4eec\u5b9e\u4f8b\u5316\u65f6&#xff0c;\u7c7b\u7684 __new__ \u521b\u5efa\u5b9e\u4f8b\u3001__init__ \u521d\u59cb\u5316\u5b9e\u4f8b\u2014\u2014\u8fd9\u4fe9\u672c\u8eab\u5c31\u662f\u9b54\u672f\u65b9\u6cd5\u3002\u6240\u4ee5\u5143\u7c7b\u7ba1\u7c7b\u7684\u8bde\u751f&#xff0c;\u9b54\u672f\u65b9\u6cd5\u7ba1\u5bf9\u8c61\u7684\u8bde\u751f\u4e0e\u884c\u4e3a&#xff0c;\u662f\u540c\u4e00\u6761&#034;\u521b\u5efa\u6d41\u6c34\u7ebf&#034;\u7684\u4e0d\u540c\u5c42\u7ea7\u3002<\/p>\n<p>2. \u7c7b\u53d8\u91cf\/\u5b9e\u4f8b\u53d8\u91cf \u2194 __new__\/__init__<\/p>\n<ul>\n<li>\u7c7b\u53d8\u91cf\u5728\u7c7b\u5b9a\u4e49\u65f6\u7531\u5143\u7c7b\/type \u5199\u5165\u7c7b\u7684\u547d\u540d\u7a7a\u95f4\u3002<\/li>\n<li>\u5b9e\u4f8b\u53d8\u91cf\u5728 __init__ \u4e2d\u901a\u8fc7 self \u7ed1\u5b9a\u3002<\/li>\n<li>\u4e24\u8005\u533a\u522b\u672c\u8d28\u662f&#034;\u5b58\u50a8\u4f4d\u7f6e\u4e0d\u540c&#034;&#xff1a;\u4e00\u4e2a\u5728\u7c7b __dict__&#xff0c;\u4e00\u4e2a\u5728\u5b9e\u4f8b __dict__\u2014\u2014\u800c\u8fd9\u70b9\u6b63\u662f\u81ea\u7701\u80fd\u9a8c\u8bc1\u7684\u3002<\/li>\n<\/ul>\n<p>3. \u4e09\u79cd\u65b9\u6cd5 \u2194 \u9b54\u672f\u65b9\u6cd5 \u2194 \u88c5\u9970\u5668<br \/>\n&#064;staticmethod\u3001&#064;classmethod \u65e2\u662f\u88c5\u9970\u5668&#xff08;\u547c\u5e94\u4f60\u4e0a\u4e00\u9898&#xff09;&#xff0c;\u53c8\u6539\u53d8\u4e86\u65b9\u6cd5\u5728\u7c7b\u4e2d\u7684\u8bed\u4e49&#xff1b;\u5b83\u4eec\u4e0e\u5b9e\u4f8b\u65b9\u6cd5\u4e00\u8d77\u6784\u6210&#034;\u65b9\u6cd5\u5206\u53d1&#034;\u7684\u57fa\u7840\u3002\u800c\u9b54\u672f\u65b9\u6cd5&#xff08;\u5982 __call__&#xff09;\u662f\u53e6\u4e00\u79cd\u9690\u5f0f\u5206\u53d1\u673a\u5236\u3002switch-case \u7684\u5b57\u5178\u5206\u53d1\u601d\u60f3&#xff0c;\u4e0e\u65b9\u6cd5\u7684\u5206\u6d3e\u673a\u5236\u540c\u6e90\u2014\u2014\u90fd\u662f&#034;\u7528\u952e\u67e5\u8868\u627e\u5230\u53ef\u8c03\u7528\u5bf9\u8c61&#034;\u3002<\/p>\n<p>4. \u81ea\u7701\u662f\u89c2\u5bdf\u6574\u4e2a\u4f53\u7cfb\u7684&#034;\u663e\u5fae\u955c&#034; &#x1f52c;<br \/>\n\u81ea\u7701\u628a\u4e0a\u9762\u6240\u6709\u6982\u5ff5\u4e32\u8d77\u6765\u9a8c\u8bc1&#xff1a;<\/p>\n<ul>\n<li>type(obj) \u2192 \u770b\u5230\u7c7b&#xff1b;type(cls) \u2192 \u770b\u5230\u5143\u7c7b\u3002<\/li>\n<li>cls.__dict__ \u2192 \u770b\u5230\u7c7b\u53d8\u91cf&#xff1b;obj.__dict__ \u2192 \u770b\u5230\u5b9e\u4f8b\u53d8\u91cf\u3002<\/li>\n<li>dir(obj) \u2192 \u5217\u51fa\u6240\u6709\u9b54\u672f\u65b9\u6cd5\u548c\u666e\u901a\u65b9\u6cd5\u3002<\/li>\n<li>inspect.ismethod \u2192 \u533a\u5206\u5b9e\u4f8b\/\u7c7b\/\u9759\u6001\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<p>&#x1f4cc; \u4e00\u53e5\u8bdd\u4e32\u8054&#xff1a;\u5143\u7c7b\u9020\u7c7b\u3001__new__\u9020\u5bf9\u8c61\u3001__init__\u586b\u53d8\u91cf\u3001\u9b54\u672f\u6cd5\u5b9a\u884c\u4e3a\u3001\u4e09\u79cd\u65b9\u6cd5\u5b9a\u8bed\u4e49\u3001\u81ea\u7701\u5bdf\u5168\u5c40\u3001switch-case\u505a\u5206\u53d1\u2014\u2014\u4ece&#034;\u5982\u4f55\u9020&#034;\u5230&#034;\u5982\u4f55\u7528&#034;\u5230&#034;\u5982\u4f55\u89c2\u5bdf&#034;&#xff0c;\u6784\u6210 Python \u9762\u5411\u5bf9\u8c61\u7684\u5b8c\u6574\u95ed\u73af\u3002<\/p>\n<p>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e09\u3001 \u51fd\u6570\u3001\u7c7b\u4e0e\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b (OOP)\u6807\u9898&#xff1a;<\/p>\n<ol>\n<li>\u51fd\u6570\u53c2\u6570\u4e0e\u9ad8\u9636\u51fd\u6570<\/li>\n<li>\u88c5\u9970\u5668\u4e0e\u95ed\u5305<\/li>\n<li>\u9762\u5411\u5bf9\u8c61\u4e09\u5927\u7279\u5f81<\/li>\n<li>\u7c7b\u3001\u5bf9\u8c61\u4e0e\u9b54\u672f\u65b9\u6cd5<\/li>\n<li>\u5f02\u5e38\u5904\u7406<\/li>\n<\/ol>\n<\/li>\n<p>\u8fd98\u4e2a\u77e5\u8bc6\u70b9\u5171\u540c\u6784\u6210\\&#8221;Python\u5bf9\u8c61\u6a21\u578b\u7684\u5b8c\u6574\u56fe\u8c31\\&#8221;&#xff1a;\u4ece\u5bf9\u8c61\u7684\u521b\u5efa\u3001\u884c\u4e3a\u3001\u81ea\u7701&#xff0c;\u5230\u5143\u5c42\u7684\u63a7\u5236&#xff0c;\u73af\u73af\u76f8\u6263&#x1f3a8; 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