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Suppose you created a polynomial in Magma with the following command:
sage: magma.eval('R<x> := PolynomialRing(RationalField()); f := (x-17/2)^3;')
Then, you can get a Sage version of that object like this:
sage: magma('f').sage()
The magma('f') part creates an object (MagmaElement) in Sage which is basically a pointer to the variable f in the Magma session. (You can actually use this perform calls on this objects which will translate to Magma commands. For example, magma('f').Factorization() is basically same as doing magma.eval('result := Factorization(f);') and returning magma('result').) The sage() method will convert a MagmaElement to the corresponding Sage object if possible.
