Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!goblin3!goblin2!goblin.stu.neva.ru!newsfeed1.swip.net!uio.no!news.tele.dk!news.tele.dk!small.news.tele.dk!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.032 X-Spam-Evidence: '*H*': 0.94; '*S*': 0.00; 'attribute': 0.07; 'class,': 0.07; 'skip:p 60': 0.07; 'instance.': 0.09; 'subject:still': 0.09; 'def': 0.12; "'__doc__',": 0.16; 'attribute,': 0.16; 'lambda': 0.16; 'storing': 0.16; 'subject:)?': 0.16; '\xa0\xa0\xa0\xa0\xa0\xa0': 0.16; 'fix': 0.17; '>>>': 0.22; 'header:User-Agent:1': 0.23; '>>>': 0.24; '>': 0.26; 'header:In-Reply-To:1': 0.27; "skip:' 10": 0.31; '"",': 0.31; 'file': 0.32; 'class': 0.32; '(most': 0.33; 'skip:_ 10': 0.34; 'skip:d 20': 0.34; 'subject:the': 0.34; 'skip:s 30': 0.35; 'done.': 0.35; 'received:google.com': 0.35; "didn't": 0.36; 'received:10': 0.37; 'message-id:@gmail.com': 0.38; 'skip:& 10': 0.38; 'skip:[ 10': 0.38; 'to:addr:python-list': 0.38; 'recent': 0.39; '12,': 0.39; 'delete': 0.39; 'to:addr:python.org': 0.39; "you're": 0.61; 'name': 0.63; 'to:2**2': 0.65; 'to:addr:gmail.com': 0.65; 'charset:windows-1252': 0.65; '8bit%:100': 0.72; "'person'": 0.84; 'remark': 0.84; 'subject:man': 0.84; '8bit%:18': 0.93 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type; bh=KEO3TDXfV7vhXjQrLtL3et4Mu6LIdv90mLaWXX7o1ow=; b=JeI526xDZH6yurMH9E82HITLl37r8j5OZSpwMU0D1e9iAjsJndDF4RapbSHQSDBEXR n9BHfPXSXGGI/neRsVyQrBJOpZfqU8Kh0XA8wMbHFMPzbSGpe2TwTdJomfq2m3NhdzZZ 31SUfK1kD/S+7E7rwm3iRT2I6qWMeWOsx1VrvgtfsDfYNU6SQEldSgdI8BKpXs9tHw6B 4MY8OTtdnziMHkEoKqfboSGSD7R7N55ateuNGZOoRzQ079YgTIiB/G9MFfCAi5YXe1sW eF6Enl0PkGqOVx/g6IOPJ8/UG+GoLf9RYt/B8E+W0fVBDMA29y/DfCsIQOK6ORddmWhF YbHg== X-Received: by 10.68.106.194 with SMTP id gw2mr16555484pbb.85.1408837508344; Sat, 23 Aug 2014 16:45:08 -0700 (PDT) Date: Sun, 24 Aug 2014 07:44:47 +0800 From: luofeiyu User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.0 MIME-Version: 1.0 To: Ian Kelly , Chris Angelico , python-list@python.org Subject: Re: why the attribute be deleted still in dir(man)? References: <53F91A91.6080205@gmail.com> In-Reply-To: Content-Type: multipart/alternative; boundary="------------000808070902020404080103" X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 128 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1408837517 news.xs4all.nl 2913 [2001:888:2000:d::a6]:46658 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:76917 This is a multi-part message in MIME format. --------------000808070902020404080103 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Think for your remark " You didn't delete the name property, which is part of the class, not the instance." I fix my codes to get the target done. class Person(object): def addProperty(self, attribute): getter = lambda self: self._getProperty(attribute) setter = lambda self, value: self._setProperty(attribute, value) deletter = lambda self:self.delProperty(attribute) setattr(self.__class__, attribute, property(fget=getter,fset=setter,fdel=deletter,doc="Auto-generated method")) def _setProperty(self, attribute, value): setattr(self, '_' + attribute, value.title()) def _getProperty(self, attribute): return getattr(self, '_' + attribute) def delProperty(self,attribute): delattr(self,'_' + attribute) delattr(self.__class__, attribute) I am so happy . > > > >>> man.delProperty("name") > > >>> man.name > > Traceback (most recent call last): > > File "", line 1, in > > File "", line 4, in > > File "", line 12, in _getProperty > > AttributeError: 'Person' object has no attribute '_name' > > >>> dir(man) > > ['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', > '__eq__', '__form > > at__', '__ge__', '__getattribute__', '__gt__', '__hash__', > '__init__', '__le__', > > '__lt__', '__module__', '__ne__', '__new__', '__reduce__', > '__reduce_ex__', '__ > > repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', > '__weakref_ > > _', '_getProperty', '_setProperty', 'addProperty', 'delProperty', > 'name'] > > You deleted the _name attribute where you're storing the value of the > name property. You didn't delete the name property, which is part of > the class, not the instance. > > --------------000808070902020404080103 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit Think for your  remark " You didn't delete the name property, which is part of the class, not the instance."
I fix my codes to get the target done.

class Person(object):
       def addProperty(self, attribute):
              getter = lambda self: self._getProperty(attribute)
              setter = lambda self, value: self._setProperty(attribute, value)
              deletter = lambda self:self.delProperty(attribute)
              setattr(self.__class__, attribute, property(fget=getter,fset=setter,fdel=deletter,doc="Auto-generated method"))
        def _setProperty(self, attribute, value):
              setattr(self, '_' + attribute, value.title())   
        def _getProperty(self, attribute):
               return getattr(self, '_' + attribute)
        def delProperty(self,attribute):
               delattr(self,'_' + attribute)
               delattr(self.__class__, attribute)

I am so happy .


> >>> man.delProperty("name")
> >>> man.name
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<stdin>", line 4, in <lambda>
>   File "<stdin>", line 12, in _getProperty
> AttributeError: 'Person' object has no attribute '_name'
> >>> dir(man)
> ['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__form
> at__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__',
>  '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__
> repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref_
> _', '_getProperty', '_setProperty', 'addProperty', 'delProperty', 'name']

You deleted the _name attribute where you're storing the value of the name property. You didn't delete the name property, which is part of the class, not the instance.



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