Hi there!
I'm trying to understand inheritance. In formal_sum I find the following
code:
class FormalSums(UniqueRepresentation, Module):
Element = FormalSum
def _element_constructor_(self, x, check=True, reduce=True):
if isinstance(x, FormalSum):
P = x.parent()
if P is self:
return x
elif P == self:
return self.element_class(x._data, check=False,
reduce=False, parent=self)
else:
x = x._data
I do not understand
this:
http://doc.sagemath.org/html/en/reference/structure/sage/structure/unique_representation.html#sage.structure.unique_representation.UniqueRepresentation
gives me the impression that "P is self" and "P == self" should be the same
thing. Is my impression wrong or is the code above misleading?
Thanks,
Martin
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