![\"\"](\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/03\/\u5143\u7c7b1.jpg\")
<\/div><\/p>\n\u4e00 \u5143\u7c7b\u4ecb\u7ecd<\/h1>\n
![\"\"](\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/03\/\u6076\u641e\u56fe47-1.jpg\")
<\/div><\/p>\n\u4ec0\u4e48\u662f\u5143\u7c7b\u5462\uff1f\u4e00\u5207\u6e90\u81ea\u4e8e\u4e00\u53e5\u8bdd\uff1apython\u4e2d\u4e00\u5207\u7686\u4e3a\u5bf9\u8c61\u3002\u8ba9\u6211\u4eec\u5148\u5b9a\u4e49\u4e00\u4e2a\u7c7b\uff0c\u7136\u540e\u9010\u6b65\u5206\u6790<\/p>\n
class StanfordTeacher(object):\n school='Stanford'\n\n def __init__(self,name,age):\n self.name=name\n self.age=age\n\n def say(self):\n print('%s says welcome to the Stanford to learn Python' %self.name)<\/code><\/pre>\n\u6240\u6709\u7684\u5bf9\u8c61\u90fd\u662f\u5b9e\u4f8b\u5316\u6216\u8005\u8bf4\u8c03\u7528\u7c7b\u800c\u5f97\u5230\u7684\uff08\u8c03\u7528\u7c7b\u7684\u8fc7\u7a0b\u79f0\u4e3a\u7c7b\u7684\u5b9e\u4f8b\u5316\uff09\uff0c\u6bd4\u5982\u5bf9\u8c61t1\u662f\u8c03\u7528\u7c7bStanfordTeacher\u5f97\u5230\u7684<\/p>\n
t1=StanfordTeacher('lili',18)\nprint(type(t1)) #\u67e5\u770b\u5bf9\u8c61t1\u7684\u7c7b\u662f<class '__main__.StanfordTeacher'><\/code><\/pre>\n\u5982\u679c\u4e00\u5207\u7686\u4e3a\u5bf9\u8c61\uff0c\u90a3\u4e48\u7c7bStanfordTeacher\u672c\u8d28\u4e5f\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u65e2\u7136\u6240\u6709\u7684\u5bf9\u8c61\u90fd\u662f\u8c03\u7528\u7c7b\u5f97\u5230\u7684\uff0c\u90a3\u4e48StanfordTeacher\u5fc5\u7136\u4e5f\u662f\u8c03\u7528\u4e86\u4e00\u4e2a\u7c7b\u5f97\u5230\u7684\uff0c\u8fd9\u4e2a\u7c7b\u79f0\u4e3a\u5143\u7c7b<\/p>\n
\u4e8e\u662f\u6211\u4eec\u53ef\u4ee5\u63a8\u5bfc\u51fa===>\u4ea7\u751fStanfordTeacher\u7684\u8fc7\u7a0b\u4e00\u5b9a\u53d1\u751f\u4e86\uff1aStanfordTeacher=\u5143\u7c7b(…)<\/strong><\/p>\nprint(type(StanfordTeacher)) # \u7ed3\u679c\u4e3a<class 'type'>\uff0c\u8bc1\u660e\u662f\u8c03\u7528\u4e86type\u8fd9\u4e2a\u5143\u7c7b\u800c\u4ea7\u751f\u7684StanfordTeacher\uff0c\u5373\u9ed8\u8ba4\u7684\u5143\u7c7b\u4e3atype<\/code><\/pre>\n![\"\"](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div><\/p>\n<\/div><\/p>\n\u4e8c class\u5173\u952e\u5b57\u521b\u5efa\u7c7b\u7684\u6d41\u7a0b\u5206\u6790<\/h1>\n
\u4e0a\u6587\u6211\u4eec\u57fa\u4e8epython\u4e2d\u4e00\u5207\u7686\u4e3a\u5bf9\u8c61\u7684\u6982\u5ff5\u5206\u6790\u51fa\uff1a\u6211\u4eec\u7528class\u5173\u952e\u5b57\u5b9a\u4e49\u7684\u7c7b\u672c\u8eab\u4e5f\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u8d1f\u8d23\u4ea7\u751f\u8be5\u5bf9\u8c61\u7684\u7c7b\u79f0\u4e4b\u4e3a\u5143\u7c7b\uff08\u5143\u7c7b\u53ef\u4ee5\u7b80\u79f0\u4e3a\u7c7b\u7684\u7c7b\uff09\uff0c\u5185\u7f6e\u7684\u5143\u7c7b\u4e3atype<\/p>\n
class\u5173\u952e\u5b57\u5728\u5e2e\u6211\u4eec\u521b\u5efa\u7c7b\u65f6\uff0c\u5fc5\u7136\u5e2e\u6211\u4eec\u8c03\u7528\u4e86\u5143\u7c7bStanfordTeacher=type(…)\uff0c\u90a3\u8c03\u7528type\u65f6\u4f20\u5165\u7684\u53c2\u6570\u662f\u4ec0\u4e48\u5462\uff1f\u5fc5\u7136\u662f\u7c7b\u7684\u5173\u952e\u7ec4\u6210\u90e8\u5206\uff0c\u4e00\u4e2a\u7c7b\u6709\u4e09\u5927\u7ec4\u6210\u90e8\u5206\uff0c\u5206\u522b\u662f<\/p>\n
1\u3001\u7c7b\u540dclass_name=’StanfordTeacher’<\/p>\n
2\u3001\u57fa\u7c7b\u4eecclass_bases=(object,)<\/p>\n
3\u3001\u7c7b\u7684\u540d\u79f0\u7a7a\u95f4class_dic\uff0c\u7c7b\u7684\u540d\u79f0\u7a7a\u95f4\u662f\u6267\u884c\u7c7b\u4f53\u4ee3\u7801\u800c\u5f97\u5230\u7684<\/p>\n
\u8c03\u7528type\u65f6\u4f1a\u4f9d\u6b21\u4f20\u5165\u4ee5\u4e0a\u4e09\u4e2a\u53c2\u6570<\/p>\n
\u7efc\u4e0a\uff0cclass\u5173\u952e\u5b57\u5e2e\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u7c7b\u5e94\u8be5\u7ec6\u5206\u4e3a\u4ee5\u4e0b\u56db\u4e2a\u8fc7\u7a0b<\/p>\n
\u63d2\u56fe\uff1a\u5143\u7c7b\u539f\u7406\u4e4b\u7c7b\u7684\u521b\u5efa\u6d41\u7a0b<\/p>\n
<\/div><\/div><\/p>\n\u8865\u5145\uff1aexec\u7684\u7528\u6cd5<\/p>\n
#exec\uff1a\u4e09\u4e2a\u53c2\u6570\n\n#\u53c2\u6570\u4e00\uff1a\u5305\u542b\u4e00\u7cfb\u5217python\u4ee3\u7801\u7684\u5b57\u7b26\u4e32\n\n#\u53c2\u6570\u4e8c\uff1a\u5168\u5c40\u4f5c\u7528\u57df\uff08\u5b57\u5178\u5f62\u5f0f\uff09\uff0c\u5982\u679c\u4e0d\u6307\u5b9a\uff0c\u9ed8\u8ba4\u4e3aglobals()\n\n#\u53c2\u6570\u4e09\uff1a\u5c40\u90e8\u4f5c\u7528\u57df\uff08\u5b57\u5178\u5f62\u5f0f\uff09\uff0c\u5982\u679c\u4e0d\u6307\u5b9a\uff0c\u9ed8\u8ba4\u4e3alocals()\n\n#\u53ef\u4ee5\u628aexec\u547d\u4ee4\u7684\u6267\u884c\u5f53\u6210\u662f\u4e00\u4e2a\u51fd\u6570\u7684\u6267\u884c\uff0c\u4f1a\u5c06\u6267\u884c\u671f\u95f4\u4ea7\u751f\u7684\u540d\u5b57\u5b58\u653e\u4e8e\u5c40\u90e8\u540d\u79f0\u7a7a\u95f4\u4e2d\ng={\n 'x':1,\n 'y':2\n}\nl={}\n\nexec('''\nglobal x,z\nx=100\nz=200\n\nm=300\n''',g,l)\n\nprint(g) #{'x': 100, 'y': 2,'z':200,......}\nprint(l) #{'m': 300}<\/code><\/pre>\n<\/div><\/p>\n\u56db \u81ea\u5b9a\u4e49\u5143\u7c7b\u63a7\u5236\u7c7bStanfordTeacher\u7684\u521b\u5efa<\/h1>\n
\u4e00\u4e2a\u7c7b\u6ca1\u6709\u58f0\u660e\u81ea\u5df1\u7684\u5143\u7c7b\uff0c\u9ed8\u8ba4\u4ed6\u7684\u5143\u7c7b\u5c31\u662ftype\uff0c\u9664\u4e86\u4f7f\u7528\u5185\u7f6e\u5143\u7c7btype\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u901a\u8fc7\u7ee7\u627ftype\u6765\u81ea\u5b9a\u4e49\u5143\u7c7b\uff0c\u7136\u540e\u4f7f\u7528metaclass\u5173\u952e\u5b57\u53c2\u6570\u4e3a\u4e00\u4e2a\u7c7b\u6307\u5b9a\u5143\u7c7b<\/p>\n
class Mymeta(type): #\u53ea\u6709\u7ee7\u627f\u4e86type\u7c7b\u624d\u80fd\u79f0\u4e4b\u4e3a\u4e00\u4e2a\u5143\u7c7b\uff0c\u5426\u5219\u5c31\u662f\u4e00\u4e2a\u666e\u901a\u7684\u81ea\u5b9a\u4e49\u7c7b\n pass\n\n# StanfordTeacher=Mymeta('StanfordTeacher',(object),{...})\nclass StanfordTeacher(object,metaclass=Mymeta): \n school='Stanford'\n\n def __init__(self,name,age):\n self.name=name\n self.age=age\n\n def say(self):\n print('%s says welcome to the Stanford to learn Python' %self.name)<\/code><\/pre>\n<\/div><\/p>\n\u81ea\u5b9a\u4e49\u5143\u7c7b\u53ef\u4ee5\u63a7\u5236\u7c7b\u7684\u4ea7\u751f\u8fc7\u7a0b\uff0c\u7c7b\u7684\u4ea7\u751f\u8fc7\u7a0b\u5176\u5b9e\u5c31\u662f\u5143\u7c7b\u7684\u8c03\u7528\u8fc7\u7a0b,\u5373StanfordTeacher=Mymeta(‘StanfordTeacher’,(object),{…})\uff0c\u8c03\u7528Mymeta\u4f1a\u5148\u4ea7\u751f\u4e00\u4e2a\u7a7a\u5bf9\u8c61StanfordTeacher\uff0c\u7136\u540e\u8fde\u540c\u8c03\u7528Mymeta\u62ec\u53f7\u5185\u7684\u53c2\u6570\u4e00\u540c\u4f20\u7ed9Mymeta\u4e0b\u7684__init__\u65b9\u6cd5\uff0c\u5b8c\u6210\u521d\u59cb\u5316\uff0c\u4e8e\u662f\u6211\u4eec\u53ef\u4ee5<\/p>\n
class Mymeta(type): #\u53ea\u6709\u7ee7\u627f\u4e86type\u7c7b\u624d\u80fd\u79f0\u4e4b\u4e3a\u4e00\u4e2a\u5143\u7c7b\uff0c\u5426\u5219\u5c31\u662f\u4e00\u4e2a\u666e\u901a\u7684\u81ea\u5b9a\u4e49\u7c7b\n def __init__(self,class_name,class_bases,class_dic):\n # print(self) #<class '__main__.StanfordTeacher'>\n # print(class_bases) #(<class 'object'>,)\n # print(class_dic) #{'__module__': '__main__', '__qualname__': 'StanfordTeacher', 'school': 'Stanford', '__init__': <function StanfordTeacher.__init__ at 0x102b95ae8>, 'say': <function StanfordTeacher.say at 0x10621c6a8>}\n super(Mymeta, self).__init__(class_name, class_bases, class_dic) # \u91cd\u7528\u7236\u7c7b\u7684\u529f\u80fd\n\n if class_name.islower():\n raise TypeError('\u7c7b\u540d%s\u8bf7\u4fee\u6539\u4e3a\u9a7c\u5cf0\u4f53' %class_name)\n\n if '__doc__' not in class_dic or len(class_dic['__doc__'].strip(' \\n')) == 0:\n raise TypeError('\u7c7b\u4e2d\u5fc5\u987b\u6709\u6587\u6863\u6ce8\u91ca\uff0c\u5e76\u4e14\u6587\u6863\u6ce8\u91ca\u4e0d\u80fd\u4e3a\u7a7a')\n\n# StanfordTeacher=Mymeta('StanfordTeacher',(object),{...})\nclass StanfordTeacher(object,metaclass=Mymeta): \n """\n \u7c7bStanfordTeacher\u7684\u6587\u6863\u6ce8\u91ca\n """\n school='Stanford'\n\n def __init__(self,name,age):\n self.name=name\n self.age=age\n\n def say(self):\n print('%s says welcome to the Stanford to learn Python' %self.name)<\/code><\/pre>\n<\/div><\/div><\/div><\/p>\n\u4e94 \u81ea\u5b9a\u4e49\u5143\u7c7b\u63a7\u5236\u7c7bStanfordTeacher\u7684\u8c03\u7528<\/h1>\n
\u50a8\u5907\u77e5\u8bc6\uff1a__call__<\/p>\n
class Foo:\n def __call__(self, *args, **kwargs):\n print(self)\n print(args)\n print(kwargs)\n\nobj=Foo()\n#1\u3001\u8981\u60f3\u8ba9obj\u8fd9\u4e2a\u5bf9\u8c61\u53d8\u6210\u4e00\u4e2a\u53ef\u8c03\u7528\u7684\u5bf9\u8c61\uff0c\u9700\u8981\u5728\u8be5\u5bf9\u8c61\u7684\u7c7b\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5__call__\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u4f1a\u5728\u8c03\u7528\u5bf9\u8c61\u65f6\u81ea\u52a8\u89e6\u53d1\n#2\u3001\u8c03\u7528obj\u7684\u8fd4\u56de\u503c\u5c31\u662f__call__\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\nres=obj(1,2,3,x=1,y=2) <\/code><\/pre>\n<\/div><\/p>\n\u7531\u4e0a\u4f8b\u5f97\u77e5\uff0c\u8c03\u7528\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5c31\u662f\u89e6\u53d1\u5bf9\u8c61\u6240\u5728\u7c7b\u4e2d\u7684__call__\u65b9\u6cd5\u7684\u6267\u884c\uff0c\u5982\u679c\u628aStanfordTeacher\u4e5f\u5f53\u505a\u4e00\u4e2a\u5bf9\u8c61\uff0c\u90a3\u4e48\u5728StanfordTeacher\u8fd9\u4e2a\u5bf9\u8c61\u7684\u7c7b\u4e2d\u4e5f\u5fc5\u7136\u5b58\u5728\u4e00\u4e2a__call__\u65b9\u6cd5<\/p>\n
class Mymeta(type): #\u53ea\u6709\u7ee7\u627f\u4e86type\u7c7b\u624d\u80fd\u79f0\u4e4b\u4e3a\u4e00\u4e2a\u5143\u7c7b\uff0c\u5426\u5219\u5c31\u662f\u4e00\u4e2a\u666e\u901a\u7684\u81ea\u5b9a\u4e49\u7c7b\n def __call__(self, *args, **kwargs):\n print(self) #<class '__main__.StanfordTeacher'>\n print(args) #('lili', 18)\n print(kwargs) #{}\n return 123\n\nclass StanfordTeacher(object,metaclass=Mymeta):\n school='Stanford'\n\n def __init__(self,name,age):\n self.name=name\n self.age=age\n\n def say(self):\n print('%s says welcome to the Stanford to learn Python' %self.name)\n\n# \u8c03\u7528StanfordTeacher\u5c31\u662f\u5728\u8c03\u7528StanfordTeacher\u7c7b\u4e2d\u7684__call__\u65b9\u6cd5\n# \u7136\u540e\u5c06StanfordTeacher\u4f20\u7ed9self,\u6ea2\u51fa\u7684\u4f4d\u7f6e\u53c2\u6570\u4f20\u7ed9*\uff0c\u6ea2\u51fa\u7684\u5173\u952e\u5b57\u53c2\u6570\u4f20\u7ed9**\n# \u8c03\u7528StanfordTeacher\u7684\u8fd4\u56de\u503c\u5c31\u662f\u8c03\u7528__call__\u7684\u8fd4\u56de\u503c\nt1=StanfordTeacher('lili',18)\nprint(t1) #123<\/code><\/pre>\n<\/div><\/p>\n\u9ed8\u8ba4\u5730\uff0c\u8c03\u7528t1=StanfordTeacher(‘lili’,18)\u4f1a\u505a\u4e09\u4ef6\u4e8b<\/p>\n
1\u3001\u4ea7\u751f\u4e00\u4e2a\u7a7a\u5bf9\u8c61obj<\/p>\n
2\u3001\u8c03\u7528__init__\u65b9\u6cd5\u521d\u59cb\u5316\u5bf9\u8c61obj<\/p>\n
3\u3001\u8fd4\u56de\u521d\u59cb\u5316\u597d\u7684obj<\/p>\n
\u5bf9\u5e94\u7740\uff0cStanfordTeacher\u7c7b\u4e2d\u7684__call__\u65b9\u6cd5\u4e5f\u5e94\u8be5\u505a\u8fd9\u4e09\u4ef6\u4e8b<\/p>\n
class Mymeta(type): #\u53ea\u6709\u7ee7\u627f\u4e86type\u7c7b\u624d\u80fd\u79f0\u4e4b\u4e3a\u4e00\u4e2a\u5143\u7c7b\uff0c\u5426\u5219\u5c31\u662f\u4e00\u4e2a\u666e\u901a\u7684\u81ea\u5b9a\u4e49\u7c7b\n def __call__(self, *args, **kwargs): #self=<class '__main__.StanfordTeacher'>\n #1\u3001\u8c03\u7528__new__\u4ea7\u751f\u4e00\u4e2a\u7a7a\u5bf9\u8c61obj\n obj=self.__new__(self) # \u6b64\u5904\u7684self\u662f\u7c7bOldoyTeacher\uff0c\u5fc5\u987b\u4f20\u53c2\uff0c\u4ee3\u8868\u521b\u5efa\u4e00\u4e2aStanfordTeacher\u7684\u5bf9\u8c61obj\n\n #2\u3001\u8c03\u7528__init__\u521d\u59cb\u5316\u7a7a\u5bf9\u8c61obj\n self.__init__(obj,*args,**kwargs)\n\n #3\u3001\u8fd4\u56de\u521d\u59cb\u5316\u597d\u7684\u5bf9\u8c61obj\n return obj\n\nclass StanfordTeacher(object,metaclass=Mymeta):\n school='Stanford'\n\n def __init__(self,name,age):\n self.name=name\n self.age=age\n\n def say(self):\n print('%s says welcome to the Stanford to learn Python' %self.name)\n\nt1=StanfordTeacher('lili',18)\nprint(t1.__dict__) #{'name': 'lili', 'age': 18}<\/code><\/pre>\n<\/div><\/p>\n\u4e0a\u4f8b\u7684__call__\u76f8\u5f53\u4e8e\u4e00\u4e2a\u6a21\u677f\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u8be5\u57fa\u7840\u4e0a\u6539\u5199__call__\u7684\u903b\u8f91\u4ece\u800c\u63a7\u5236\u8c03\u7528StanfordTeacher\u7684\u8fc7\u7a0b\uff0c\u6bd4\u5982\u5c06StanfordTeacher\u7684\u5bf9\u8c61\u7684\u6240\u6709\u5c5e\u6027\u90fd\u53d8\u6210\u79c1\u6709\u7684<\/p>\n
class Mymeta(type): #\u53ea\u6709\u7ee7\u627f\u4e86type\u7c7b\u624d\u80fd\u79f0\u4e4b\u4e3a\u4e00\u4e2a\u5143\u7c7b\uff0c\u5426\u5219\u5c31\u662f\u4e00\u4e2a\u666e\u901a\u7684\u81ea\u5b9a\u4e49\u7c7b\n def __call__(self, *args, **kwargs): #self=<class '__main__.StanfordTeacher'>\n #1\u3001\u8c03\u7528__new__\u4ea7\u751f\u4e00\u4e2a\u7a7a\u5bf9\u8c61obj\n obj=self.__new__(self) # \u6b64\u5904\u7684self\u662f\u7c7bStanfordTeacher\uff0c\u5fc5\u987b\u4f20\u53c2\uff0c\u4ee3\u8868\u521b\u5efa\u4e00\u4e2aStanfordTeacher\u7684\u5bf9\u8c61obj\n\n #2\u3001\u8c03\u7528__init__\u521d\u59cb\u5316\u7a7a\u5bf9\u8c61obj\n self.__init__(obj,*args,**kwargs)\n\n # \u5728\u521d\u59cb\u5316\u4e4b\u540e\uff0cobj.__dict__\u91cc\u5c31\u6709\u503c\u4e86\n obj.__dict__={'_%s__%s' %(self.__name__,k):v for k,v in obj.__dict__.items()}\n #3\u3001\u8fd4\u56de\u521d\u59cb\u5316\u597d\u7684\u5bf9\u8c61obj\n return obj\n\nclass StanfordTeacher(object,metaclass=Mymeta):\n school='Stanford'\n\n def __init__(self,name,age):\n self.name=name\n self.age=age\n\n def say(self):\n print('%s says welcome to the Stanford to learn Python' %self.name)\n\nt1=StanfordTeacher('lili',18)\nprint(t1.__dict__) #{'_StanfordTeacher__name': 'lili', '_StanfordTeacher__age': 18}<\/code><\/pre>\n\u4e0a\u4f8b\u4e2d\u6d89\u53ca\u5230\u67e5\u627e\u5c5e\u6027\u7684\u95ee\u9898\uff0c\u6bd4\u5982self.__new__\uff0c\u8bf7\u770b\u4e0b\u4e00\u5c0f\u8282<\/p>\n
<\/div><\/p>\n\u4e94 \u518d\u770b\u5c5e\u6027\u67e5\u627e<\/h1>\n
<\/p>
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