{"id":4255,"date":"2022-03-19T22:23:08","date_gmt":"2022-03-19T14:23:08","guid":{"rendered":"https:\/\/egonlin.com\/?p=4255"},"modified":"2022-04-26T13:45:54","modified_gmt":"2022-04-26T05:45:54","slug":"%e7%ac%ac%e5%85%ad%e7%af%87%ef%bc%9a%e5%8f%8d%e5%b0%84%e3%80%81%e5%86%85%e7%bd%ae%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=4255","title":{"rendered":"\u7b2c\u516d\u7bc7\uff1a\u53cd\u5c04\u3001\u5185\u7f6e\u65b9\u6cd5"},"content":{"rendered":"

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\u4e00 \u53cd\u5c04<\/h1>\n

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\u5728Python\u4e2d\uff0c\u53cd\u5c04\u6307\u7684\u662f\u901a\u8fc7\u5b57\u7b26\u4e32\u6765\u64cd\u4f5c\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u6d89\u53ca\u5230\u56db\u4e2a\u5185\u7f6e\u51fd\u6570\u7684\u4f7f\u7528\uff08Python\u4e2d\u4e00\u5207\u7686\u5bf9\u8c61\uff0c\u7c7b\u548c\u5bf9\u8c61\u90fd\u53ef\u4ee5\u7528\u4e0b\u8ff0\u56db\u4e2a\u65b9\u6cd5\uff09<\/p>\n

class Teacher:\n    def __init__(self,full_name):\n        self.full_name =full_name\n\nt=Teacher('Egon Lin')\n\n# hasattr(object,'name')\nhasattr(t,'full_name') # \u6309\u5b57\u7b26\u4e32'full_name'\u5224\u65ad\u6709\u65e0\u5c5e\u6027t.full_name\n\n# getattr(object, 'name', default=None)\ngetattr(t,'full_name',None) # \u7b49\u540c\u4e8et.full_name,\u4e0d\u5b58\u5728\u8be5\u5c5e\u6027\u5219\u8fd4\u56de\u9ed8\u8ba4\u503cNone\n\n# setattr(x, 'y', v)\nsetattr(t,'age',18) # \u7b49\u540c\u4e8et.age=18\n\n# delattr(x, 'y')\ndelattr(t,'age') # \u7b49\u540c\u4e8edel t.age<\/code><\/pre>\n
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\u57fa\u4e8e\u53cd\u5c04\u53ef\u4ee5\u5341\u5206\u7075\u6d3b\u5730\u64cd\u4f5c\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u6bd4\u5982\u5c06\u7528\u6237\u4ea4\u4e92\u7684\u7ed3\u679c\u53cd\u5c04\u5230\u5177\u4f53\u7684\u529f\u80fd\u6267\u884c<\/p>\n
>>> class FtpServer:\n...     def serve_forever(self):\n...         while True:\n...             inp=input('input your cmd>>: ').strip()\n...             cmd,file=inp.split()\n...             if hasattr(self,cmd): # \u6839\u636e\u7528\u6237\u8f93\u5165\u7684cmd\uff0c\u5224\u65ad\u5bf9\u8c61self\u6709\u65e0\u5bf9\u5e94\u7684\u65b9\u6cd5\u5c5e\u6027\n...                 func=getattr(self,cmd) # \u6839\u636e\u5b57\u7b26\u4e32cmd\uff0c\u83b7\u53d6\u5bf9\u8c61self\u5bf9\u5e94\u7684\u65b9\u6cd5\u5c5e\u6027\n...                 func(file)\n...     def get(self,file):\n...         print('Downloading %s...' %file)\n...     def put(self,file):\n...         print('Uploading %s...' %file)\n... \n>>> server=FtpServer()\n>>> server.serve_forever()\ninput your cmd>>: get a.txt\nDownloading a.txt...\ninput your cmd>>: put a.txt\nUploading a.txt...<\/code><\/pre>\n
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\u4e8c \u5185\u7f6e\u65b9\u6cd5<\/h1>\n
MARKDOWN_HASHd01685de4679355f62d70da65d2fa45fMARKDOWNHASH\uff1a
\nPython\u7684Class\u673a\u5236\u5185\u7f6e\u4e86\u5f88\u591a\u7279\u6b8a\u7684\u65b9\u6cd5\u6765\u5e2e\u52a9\u4f7f\u7528\u8005\u9ad8\u5ea6\u5b9a\u5236\u81ea\u5df1\u7684\u7c7b\uff0c\u8fd9\u4e9b\u5185\u7f6e\u65b9\u6cd5\u90fd\u662f\u4ee5\u53cc\u4e0b\u5212\u7ebf\u5f00\u5934\u548c\u7ed3\u5c3e\u7684\uff0c\u4f1a\u5728\u6ee1\u8db3\u67d0\u79cd\u6761\u4ef6\u65f6\u81ea\u52a8\u89e6\u53d1\uff0c\u6211\u4eec\u4ee5\u5e38\u7528\u7684__str__\u548c__del\\<\/em>_\u4e3a\u4f8b\u6765\u7b80\u5355\u4ecb\u7ecd\u5b83\u4eec\u7684\u4f7f\u7528\u3002<\/p>\n
\"\"<\/div><\/p>\n
__str__\u65b9\u6cd5\u4f1a\u5728\u5bf9\u8c61\u88ab\u6253\u5370\u65f6\u81ea\u52a8\u89e6\u53d1\uff0cprint\u529f\u80fd\u6253\u5370\u7684\u5c31\u662f\u5b83\u7684\u8fd4\u56de\u503c\uff0c\u6211\u4eec\u901a\u5e38\u57fa\u4e8e\u65b9\u6cd5\u6765\u5b9a\u5236\u5bf9\u8c61\u7684\u6253\u5370\u4fe1\u606f\uff0c\u8be5\u65b9\u6cd5\u5fc5\u987b\u8fd4\u56de\u5b57\u7b26\u4e32\u7c7b\u578b<\/p>\n
>>> class People:\n...     def __init__(self,name,age):\n...         self.name=name\n...         self.age=age\n...     def __str__(self):\n...         return '<Name:%s Age:%s>' %(self.name,self.age) #\u8fd4\u56de\u7c7b\u578b\u5fc5\u987b\u662f\u5b57\u7b26\u4e32\n... \n>>> p=People('lili',18)\n>>> print(p) #\u89e6\u53d1p.__str__()\uff0c\u62ff\u5230\u8fd4\u56de\u503c\u540e\u8fdb\u884c\u6253\u5370\n<Name:lili Age:18><\/code><\/pre>\n
__del__\u4f1a\u5728\u5bf9\u8c61\u88ab\u5220\u9664\u65f6\u81ea\u52a8\u89e6\u53d1\u3002\u7531\u4e8ePython\u81ea\u5e26\u7684\u5783\u573e\u56de\u6536\u673a\u5236\u4f1a\u81ea\u52a8\u6e05\u7406Python\u7a0b\u5e8f\u7684\u8d44\u6e90\uff0c\u6240\u4ee5\u5f53\u4e00\u4e2a\u5bf9\u8c61\u53ea\u5360\u7528\u5e94\u7528\u7a0b\u5e8f\u7ea7\u8d44\u6e90\u65f6\uff0c\u5b8c\u5168\u6ca1\u5fc5\u8981\u4e3a\u5bf9\u8c61\u5b9a\u5236__del__\u65b9\u6cd5\uff0c\u4f46\u5728\u4ea7\u751f\u4e00\u4e2a\u5bf9\u8c61\u7684\u540c\u65f6\u6d89\u53ca\u5230\u7533\u8bf7\u7cfb\u7edf\u8d44\u6e90\uff08\u6bd4\u5982\u7cfb\u7edf\u6253\u5f00\u7684\u6587\u4ef6\u3001\u7f51\u7edc\u8fde\u63a5\u7b49\uff09\u7684\u60c5\u51b5\u4e0b\uff0c\u5173\u4e8e\u7cfb\u7edf\u8d44\u6e90\u7684\u56de\u6536\uff0cPython\u7684\u5783\u573e\u56de\u6536\u673a\u5236\u4fbf\u6d3e\u4e0d\u4e0a\u7528\u573a\u4e86\uff0c\u9700\u8981\u6211\u4eec\u4e3a\u5bf9\u8c61\u5b9a\u5236\u8be5\u65b9\u6cd5\uff0c\u7528\u6765\u5728\u5bf9\u8c61\u88ab\u5220\u9664\u65f6\u81ea\u52a8\u89e6\u53d1\u56de\u6536\u7cfb\u7edf\u8d44\u6e90\u7684\u64cd\u4f5c<\/p>\n
class MySQL:\n    def __init__(self,ip,port):\n        self.conn=connect(ip,port) # \u4f2a\u4ee3\u7801\uff0c\u53d1\u8d77\u7f51\u7edc\u8fde\u63a5\uff0c\u9700\u8981\u5360\u7528\u7cfb\u7edf\u8d44\u6e90\n    def __del__(self):\n        self.conn.close() # \u5173\u95ed\u7f51\u7edc\u8fde\u63a5\uff0c\u56de\u6536\u7cfb\u7edf\u8d44\u6e90\n\nobj=MySQL('127.0.0.1',3306) # \u5728\u5bf9\u8c61obj\u88ab\u5220\u9664\u65f6\uff0c\u81ea\u52a8\u89e6\u53d1obj.__del__()<\/code><\/pre>\n
\"\"<\/div><\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e00 \u53cd\u5c04 \u5728Python\u4e2d\uff0c\u53cd\u5c04\u6307\u7684\u662f\u901a\u8fc7\u5b57\u7b26\u4e32\u6765\u64cd\u4f5c\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u6d89\u53ca\u5230\u56db\u4e2a\u5185\u7f6e\u51fd\u6570\u7684\u4f7f\u7528\uff08Python\u4e2d\u4e00\u5207 […]<\/p>\n","protected":false},"author":3,"featured_media":6719,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,281,328],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/4255"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4255"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/4255\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/6719"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4255"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4255"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4255"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}