On Thu, 31 Dec 2015 10:30 pm, Charles T. Smith wrote:
> On Thu, 31 Dec 2015 11:21:59 +1100, Ben Finney wrote:
>
>> Steven D'Aprano writes:
>>
>>> On Thu, 31 Dec 2015 10:13 am, Ben Finney wrote:
>>>
>>> > You may be familiar with other languages where the distinction
>>> > between “attribute of
Hmmm, you seem to be pasting in text from multiple messages, and jumping
around in time ("Ian had said, to which I answered") which may get a bit
confusing. Hopefully I can answer without getting lost :-)
On Thu, 31 Dec 2015 10:17 pm, Charles T. Smith wrote:
> On Thu, 31 Dec 2015 10:50:53 +1100,
On Thu, 31 Dec 2015 12:12:43 +, Oscar Benjamin wrote:
> When you write x.attr the name 'attr' is looked up on the object x. This
> calls x.__getattribute__('attr'). In turn this checks the dict
> associated with the object x i.e. x.__dict__['attr']. This in turn calls
> x.__dict__.__getitem__
On Wed, 30 Dec 2015 17:31:11 -0700, Ian Kelly wrote:
>> In any case, I thought that class attributes were, in fact, items of
>> __dict__?
>
> That's correct, but as I said in my previous message, self.attrs and
> self.attrs.__dict__ are two different dicts, and you're confusing one
> for the othe
On 31 December 2015 at 11:30, Charles T. Smith
wrote:
>>> Obviously there is a syntax difference between x.attr and x['key']
>>
>> Not merely syntax; the attributes of an object are not generally
>> available as items of the container.
>
>
> What are the set of ways that an attribute is accessible
"Charles T. Smith" writes:
> On Thu, 31 Dec 2015 11:21:59 +1100, Ben Finney wrote:
>
> > Tersely: the relationship between an object and its attributes, is
> > not the same as the relationship between a dictionary and its items.
>
> I understand this to mean that the relationship between a dictio
On Thu, 31 Dec 2015 11:21:59 +1100, Ben Finney wrote:
> Steven D'Aprano writes:
>
>> On Thu, 31 Dec 2015 10:13 am, Ben Finney wrote:
>>
>> > You may be familiar with other languages where the distinction
>> > between “attribute of an object” is not distinct from “item in a
>> > dictionary”. Pyth
On Thu, 31 Dec 2015 10:50:53 +1100, Steven D'Aprano wrote:
> I'm not sure what distinction you're referring to, can you explain?
Ian Kelly had said:
>> How precisely are you trying to store these: as an attribute, or as a
>> dict item? If it's supposed to be in the dict, then why is your
>> __ge
On Wed, Dec 30, 2015 at 3:54 PM, Charles T. Smith
wrote:
> On Wed, 30 Dec 2015 13:40:44 -0700, Ian Kelly wrote:
>
>> On Wed, Dec 30, 2015 at 9:58 AM, Charles T. Smith
>>> The problem is that then triggers the __getitem__() method and I don't
>>> know how to get to the attributes without triggering
Steven D'Aprano writes:
> On Thu, 31 Dec 2015 10:13 am, Ben Finney wrote:
>
> > You may be familiar with other languages where the distinction
> > between “attribute of an object” is not distinct from “item in a
> > dictionary”. Python is not one of those languages; the distinction
> > is real an
On Thu, 31 Dec 2015 10:13 am, Ben Finney wrote:
> You may be familiar with other languages where the distinction between
> “attribute of an object” is not distinct from “item in a dictionary”.
> Python is not one of those languages; the distinction is real and
> important.
I'm not sure what dist
On Thu, 31 Dec 2015 10:13:53 +1100, Ben Finney wrote:
> "Charles T. Smith" writes:
>
>> I don't understand this distinction between an "attribute" and a "dict
>> item".
>
> When did you most recently work through the Python tutorial
> https://docs.python.org/3/tutorial/>> You may want to work t
"Charles T. Smith" writes:
> I don't understand this distinction between an "attribute" and a "dict
> item".
When did you most recently work through the Python tutorial
https://docs.python.org/3/tutorial/>> You may want to work through
it again, from start to finish and exercising each example,
On Wed, 30 Dec 2015 22:54:44 +, Charles T. Smith wrote:
> But I concede I must be doing something fundamentally wrong because this
> assert is triggering:
> def __getattr__ (self, name):
> print "attrdict:av:__getattr__: entered for ", name
> assert name not in self.keys(),
On Wed, 30 Dec 2015 13:40:44 -0700, Ian Kelly wrote:
> On Wed, Dec 30, 2015 at 9:58 AM, Charles T. Smith
>> The problem is that then triggers the __getitem__() method and I don't
>> know how to get to the attributes without triggering __getattr__().
>>
>> It's the interplay of the two that's killi
On Wed, Dec 30, 2015 at 9:58 AM, Charles T. Smith
wrote:
> On Wed, 30 Dec 2015 08:35:57 -0700, Ian Kelly wrote:
>
>> On Dec 30, 2015 7:46 AM, "Charles T. Smith"
>> wrote:
>>> As is so often the case, in composing my answer to your question, I
>>> discovered a number of problems in my class (e.g.
On Wed, 30 Dec 2015 08:35:57 -0700, Ian Kelly wrote:
> On Dec 30, 2015 7:46 AM, "Charles T. Smith"
> wrote:
>> As is so often the case, in composing my answer to your question, I
>> discovered a number of problems in my class (e.g. I was calling
>> __getitem__() myself!), but I'm puzzled now how
On Dec 30, 2015 7:46 AM, "Charles T. Smith" wrote:
> As is so often the case, in composing my answer to your question, I discovered
> a number of problems in my class (e.g. I was calling __getitem__() myself!),
> but
> I'm puzzled now how to proceed. I thought the way you avoid triggering
> __g
On Thu, 31 Dec 2015 00:11:24 +1100, Chris Angelico wrote:
> On Wed, Dec 30, 2015 at 11:57 PM, Charles T. Smith
> wrote:
>> Hello,
>>
>> I thought __getitem__() was invoked when an object is postfixed with an
>> expression in brackets:
>>
>> - abc[n]
>>
>> and __getattr__() was invoked when an o
On Wed, Dec 30, 2015 at 11:57 PM, Charles T. Smith
wrote:
> Hello,
>
> I thought __getitem__() was invoked when an object is postfixed with an
> expression in brackets:
>
> - abc[n]
>
> and __getattr__() was invoked when an object is postfixed with an dot:
>
> - abc.member
That would be norma
Hello,
I thought __getitem__() was invoked when an object is postfixed with an
expression in brackets:
- abc[n]
and __getattr__() was invoked when an object is postfixed with an dot:
- abc.member
but my __getitem__ is being invoked at this time, where there's no
subscript (going into a s
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