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I would do it this way:

sage: z = var('x y')
sage: zvals = (1, 2)
sage: w(x,y)=x^2+y^2

Note that w explicitly lists the order of arguments...

sage: w(*zvals)
5

Python documentation of the *mylist syntax is here.

Here is another way:

sage: w(1,2)
5
sage: w(x=zvals[0], y=zvals[1])
5