So while I agree with the definitions of incomplete and co-dominance that you posted earlier (and have been harping on their use in herps for a while), they only refer to the expression of alleles at a single locus not the expression of alleles at different loci (genes). So, while we would say that the anaconda allele is incompletely dominant with respect to the wild-type pattern and itself, we would not say that its co-dominant to albino because you can have albino anacondas. They are not co-dominant since different genes (loci) are responsible are each trait. Similarly, my brown hair is not co-dominant with my ability to taste bitter things because different genes are involved.

The best example of co-dominance I can think of are roan coat color in horses and cattle and blood types. Roan coats look pink or spotted, because there is dark hair and light hair in the same animal. Similarly you can have a blood type AB because you carry the gene for both type A and type B and both proteins are expressed on your blood cells.

Vinny
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“There is a grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that whilst this planet has gone on cycling according to the fixed laws of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.” -C. Darwin, 1859

Natural Selection Reptiles

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