[Python-ideas] Extension of python/json syntax to support explicitly sets and ordered dict.
Steven D'Aprano
steve at pearwood.info
Thu Sep 7 07:54:15 EDT 2017
On Thu, Sep 07, 2017 at 01:36:31PM +0200, Matteo Nastasi wrote:
> A set could be defined as { item1, item2, item3[...] }
Guido's time machine strikes again. Python 3:
py> s = {1, 2, 3}
py> type(s)
<class 'set'>
> with {,} as an empty set
That looks like a typo. I don't think that having a literal for empty
sets is important enough that we need worry about the lack.
> An ordered dict could be defined as [ item1: value1, item2: value2 ... ]
> with [:] ase an empty odered dict
I think that's been proposed before.
I don't hate that suggestion, but I don't think its very useful either.
We already have a de facto "Ordered Mapping" literal that can be passed
to the OrderedDict constructor:
OrderedDict(
[(key1, value1), (key2, value2), (key3, value3), ...]
)
Its not quite as compact, but it isn't too awful. And if you really
don't like it, try:
OrderedDict(zip(keys, values))
--
Steven
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