The debate got more interesting than I expected. Without taking sides, I would
like to add that perhaps my "length" example was misleading: length is easy to
calculate. The information could be hard to extract from the data, either
because complex calculations are involved, or because it is not
On Sun, Aug 18, 2013 at 12:40 AM, Steven D'Aprano
wrote:
> The Law of Demeter is really about being careful about what interface
> your classes provide. Customers should provide a get_payment method; dogs
> should provide a walk method. You shouldn't have to send individual step
> messages to the
On Sun, 18 Aug 2013 00:52:06 +0200, Irmen de Jong wrote:
> On 17-8-2013 19:18, Steven D'Aprano wrote:
[...]
>> How is this:
>>
>> obj.data_length()
>>
>> easier for the user than this?
>>
>> len(obj.data)
>>
>>
> It's not easier for the user perse, but it might be preferable from a
> design p
On 17-8-2013 19:18, Steven D'Aprano wrote:
> On Sat, 17 Aug 2013 09:53:07 -0700, Fernando Saldanha wrote:
>
>> Suppose my class contains an attribute called "data" that can
>> potentially provide a lot of information that will be needed by class
>> users. I have two options:
>>
>> 1) For each piec
On 2013-08-17 17:18, Steven D'Aprano wrote:
> # Yes, this is good, consistent design
> len(myrecord.field)
> len(obj.data)
> len(data.value)
> len(collection[key])
I would also add that, if the primary goal of your class is to
encapsulate the data, you can do
class MyClass:
def __init__(sel
On Sat, 17 Aug 2013 09:53:07 -0700, Fernando Saldanha wrote:
> Suppose my class contains an attribute called "data" that can
> potentially provide a lot of information that will be needed by class
> users. I have two options:
>
> 1) For each piece of information within data (e.g., length) I write
On 17/08/2013 17:53, Fernando Saldanha wrote:
I am new to Python.
I understand that it is "unpythonic" to write getters and setters, and that
property() can be used if necessary.
This deals with the case of attributes, but there are other kinds of
information available within a class.
Suppos
