Consider the sets a={1} and b={2}. As output I want {1,{2}}. I tried
sage: a={1};b={2}
sage: a.add(b)and
sage: a.union({b})but both attempts result in an error:
TypeError: unhashable type: 'set'To circumvent this problem the frozenset (which can't be modified after creation) was invented:
sage: a.add(frozenset(b))
sage: a
{1, frozenset({2})}Another alternative is to use Sage's Set:
sage: a=Set([1])
sage: b=Set([2])
sage: a.union(Set([b]))
{1, {2}}How can I remove frozenset in the output?
You can't really, unless you make a custom type, or call a custom printing function. I offer SageMath's Set as an alternative.
SageMath's Set is the solution for me, thank you! I didn't know about these two different functions (set and Set) and thought there was only one.
Asked: 2 years ago
Seen: 260 times
Last updated: Apr 12 '22
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