Just to expand on that answer: Plain python prints the empty dictionary as
{} so it has the potential to be confusing to people that know Python:
>>> set()
set([])
>>> set([1])
set([1])
>>> dict()
{}
>>> dict(a=1)
{'a': 1}
On Friday, April 1, 2016 at 11:07:48 AM UTC+2, Viviane Pons wrote:
>
> I would say it's a python thing, and it's probably because {} is actually
> a dictionarry and not a set.
>
> 2016-04-01 11:04 GMT+02:00 Sébastien Labbé <sla...@gmail.com <javascript:>
> >:
>
>> sage: set([1])
>> {1}
>> sage: set()
>> set()
>>
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