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Date: Sun, 24 Aug 2014 11:23:28 +0800
From: luofeiyu <elearn2014@gmail.com>
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To: Ian Kelly <ian.g.kelly@gmail.com>, python-list@python.org
Subject: Re: the output in reference of descriptor.
References: <53F69BEE.5000000@gmail.com> <CALwzidmGMn2oPm91PbL-P2_=v2G+ijrWaisZRY-k_KnwS91VoQ@mail.gmail.com>
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let me paste it again to make my question more clear:

     >>>c2.d
     __get__() is called <__main__.C2 object at 0x000000000297BE10> 
<class '__main__.C2'>
     <__main__.C object at 0x000000000297BBA8>

     >>> c2.d.a
     __get__() is called <__main__.C2 object at 0x000000000297BE10> 
<class '__main__.C2'>
     __getattribute__() is called
     'abc'

Why the result of c2.d.a  is not :

     __get__() is called <__main__.C2 object at 0x000000000297BE10> 
<class __main__.C2'>
     <__main__.C object at 0x000000000297BBA8>
     __getattribute__() is called
     'abc'

Why the` return self` in the __get__ method in class C  does not work? 
Why there is no <__main__.C object at 0x000000000297BBA8>  in the output?


and the source code are:


|class C(object):
     a = 'abc'
     def __getattribute__(self, *args, **kwargs):
         print("__getattribute__() is called")
         return object.__getattribute__(self, *args, **kwargs)
     def __getattr__(self, name):
         print("__getattr__() is called ")
         return name + " from getattr"
     def __get__(self, instance, owner):
         print("__get__() is called", instance, owner)
         return self
     def foo(self, x):
         print(x)


class C2(object):
     d = C()


|


On 8/23/2014 12:10 PM, Ian Kelly wrote:
> On Thu, Aug 21, 2014 at 7:25 PM, luofeiyu <elearn2014@gmail.com 
> <mailto:elearn2014@gmail.com>> wrote:
> > >>> c2.d.a
> > __get__() is called <__main__.C2 object at 0x000000000297BE10> 
> <class '__main__.
> > C2'>
> > __getattribute__() is called
> > 'abc'
> >
> > Why the result of c2.d.a  is not :
> >
> > __get__() is called <__main__.C2 object at 0x000000000297BE10> 
> <class '__main__.
> > C2'>
> > __getattribute__() is called
> > 'abc'
>
> As far as I can tell you pasted the same output twice, so I don't 
> understand what it is that you're asking.
>
>
>
>


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      http-equiv="Content-Type">
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    let me paste it again to make my question more clear:<br>
    <br>
        &gt;&gt;&gt;c2.d  <br>
        __get__() is called &lt;__main__.C2 object at
    0x000000000297BE10&gt; &lt;class '__main__.C2'&gt;  <br>
        &lt;__main__.C object at 0x000000000297BBA8&gt;  <br>
    <br>
        &gt;&gt;&gt; c2.d.a  <br>
        __get__() is called &lt;__main__.C2 object at
    0x000000000297BE10&gt; &lt;class '__main__.C2'&gt;  <br>
        __getattribute__() is called    <br>
        'abc'  <br>
      <br>
    Why the result of c2.d.a  is not :   <br>
      <br>
        __get__() is called &lt;__main__.C2 object at
    0x000000000297BE10&gt; &lt;class __main__.C2'&gt;    <br>
        &lt;__main__.C object at 0x000000000297BBA8&gt;      <br>
        __getattribute__() is called      <br>
        'abc'      <br>
      <br>
    Why the` return self` in the __get__ method in class C  does not
    work? Why there is no &lt;__main__.C object at
    0x000000000297BBA8&gt;  in the output? <br>
    <br>
    <br>
    and the source code are:<br>
    <br>
    <br>
    <pre><code>class C(object):  
    a = 'abc'  
    def __getattribute__(self, *args, **kwargs):  
        print("__getattribute__() is called")  
        return object.__getattribute__(self, *args, **kwargs)  
    def __getattr__(self, name):  
        print("__getattr__() is called ")  
        return name + " from getattr"  
    def __get__(self, instance, owner):  
        print("__get__() is called", instance, owner)  
        return self  
    def foo(self, x):  
        print(x)  


class C2(object):  
    d = C() 


</code></pre>
    <br>
    <div class="moz-cite-prefix">On 8/23/2014 12:10 PM, Ian Kelly wrote:<br>
    </div>
    <blockquote
cite="mid:CALwzidmGMn2oPm91PbL-P2_=v2G+ijrWaisZRY-k_KnwS91VoQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">On Thu, Aug 21, 2014 at 7:25 PM, luofeiyu &lt;<a
          moz-do-not-send="true" href="mailto:elearn2014@gmail.com">elearn2014@gmail.com</a>&gt;
        wrote:<br>
        &gt; &gt;&gt;&gt; c2.d.a<br>
        &gt; __get__() is called &lt;__main__.C2 object at
        0x000000000297BE10&gt; &lt;class '__main__.<br>
        &gt; C2'&gt;<br>
        &gt; __getattribute__() is called<br>
        &gt; 'abc'<br>
        &gt;<br>
        &gt; Why the result of c2.d.a  is not :<br>
        &gt;<br>
        &gt; __get__() is called &lt;__main__.C2 object at
        0x000000000297BE10&gt; &lt;class '__main__.<br>
        &gt; C2'&gt;<br>
        &gt; __getattribute__() is called<br>
        &gt; 'abc'<br>
        <br>
        <div>As far as I can tell you pasted the same output twice, so I
          don't understand what it is that you're asking.</div>
        <div><br>
        </div>
        <br>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
    </blockquote>
    <br>
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