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-   -   Re: Java singletonMap in Python (http://www.velocityreviews.com/forums/t952619-re-java-singletonmap-in-python.html)

Mark Lawrence 09-24-2012 07:44 PM

Re: Java singletonMap in Python
 
On 24/09/2012 20:22, Devin Jeanpierre wrote:
> On Sun, Sep 23, 2012 at 7:14 PM, Mark Lawrence <breamoreboy@yahoo.co.uk> wrote:
>> Purely for fun I've been porting some code to Python and came across the
>> singletonMap[1]. I'm aware that there are loads of recipes on the web for
>> both singletons e.g.[2] and immutable dictionaries e.g.[3]. I was wondering
>> how to combine any of the recipes to produce the best implementation

>
> The word "singleton" usually means "thing with only one item". For
> example, {a} is a singleton set containing only a, and with matrices,
> any dimension of size one is called a singleton dimension, and so on.
> In this case, a singleton map is a map with only one key-value pair,
> such as {a:b}.
>
> The singleton design antipattern is not relevant here.
>
> -- Devin
>


Java thinks so otherwise there wouldn't also be the singleton which is
the spelling for singletonSet (don't ask me!!!) and a singletonList.
From the Python viewpoint I think YAGNI is perfect. I now understand
why the BDFL and others fight so hard to keep bloatware out of the
standard library.

--
Cheers.

Mark Lawrence.



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