With this code (follow up of
https://groups.google.com/forum/#!topic/sage-devel/4uxI1XVtoDs):
from sage.matrix.matrix_mod2_dense import Matrix_mod2_dense
from sage.matrix.matrix_gf2e_dense import Matrix_gf2e_dense
class LinearLayerGeneric:
def _repr_(self):
return "LinearLayer of dimension %d x %d represented by\n%s" \
% (self.dimensions() + (self.parent(self),))
def LinearLayer(L):
parent = L.parent()
return type("LinearLayerGF2", (LinearLayerGeneric, Matrix_mod2_dense),
{})(parent, L)
ll = LinearLayer(matrix(GF(2), 2, 2, [1, 0, 0, 1]))
I would expect to see
sage: ll
LinearLayer of dimension 2 x 2 represented by
[1 0]
[0 1]
But what I instead get, is this
sage: ascii_art(ll, " vs ", ll._repr_())
LinearLayer of dimension 2 x 2 represented by
[1 0] [1 0]
[0 1] vs [0 1]
So why is the _repr_() method from the matrix class called and not from
LinearLayerGeneric?
The LinearLayer class is also listed first in the __mro__:
sage: ll.__class__.__mro__
(<class '__main__.LinearLayerGF2'>,
<class __main__.LinearLayerGeneric at 0x7f4ab67e46d0>,
<type 'sage.matrix.matrix_mod2_dense.Matrix_mod2_dense'>,
<type 'sage.matrix.matrix_dense.Matrix_dense'>,
<type 'sage.matrix.matrix2.Matrix'>,
<type 'sage.matrix.matrix1.Matrix'>,
<type 'sage.matrix.matrix0.Matrix'>,
<type 'sage.structure.element.Matrix'>,
<type 'sage.structure.element.ModuleElement'>,
<type 'sage.structure.element.Element'>,
<type 'sage.structure.sage_object.SageObject'>,
<type 'object'>)
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