Ian Kelly <ian.g.ke...@gmail.com>:
> On Fri, Nov 20, 2015 at 5:28 AM, Marko Rauhamaa <ma...@pacujo.net> wrote:
>> One could argue that you should always use a sentinel object for
>> default values. That also allows you to distinguish between omitted
>> values and default values:
>>
>> def asklist(caption, data, n=omitted, rows=omitted, width=omitted,
>> flags=omitted, buttons=omitted, tablist=omitted,
>> heading=omitted):
>>
>> but that would be rather pedantic in most circumstances.
>
> I think that would be bad design; in general, you shouldn't *need* to
> distinguish whether the value was omitted, because it should always be
> possible to explicitly pass the default value.
Consider the mutator pattern:
def name(self, value=omitted):
if value is omitted:
return self._name
self._name = value
<URL: https://en.wikipedia.org/wiki/Mutator_method#C.2B.2B_example>
Marko
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