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I don't think there is a method that allows you to do this. This is one step away:
sage: list(WeightedIntegerVectors(3, [1,1]))
[[0, 3], [1, 2], [2, 1], [3, 0]]
(This gives all lists of integers [a,b]
so that 1*a + 1*b = 3
.) So:
sage: R.<x,y> = PolynomialRing(QQ, 2)
sage: degs = WeightedIntegerVectors(3, [1,1])
sage: [x^d[0] * y^d[1] for d in degs]
[y^3, x*y^2, x^2*y, x^3]