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Re: Java singletonMap in Python

Mark Lawrence
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On 24/09/2012 20:22, Devin Jeanpierre wrote:
> On Sun, Sep 23, 2012 at 7:14 PM, Mark Lawrence <(E-Mail Removed)> 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.


Mark Lawrence.

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