I’m trying to use fenics to solve the attached equation, however I cannot figure out how to represent this in the code?

I defined the variational problem as such:

(u, p) = TrialFunctions(W)

(v, q) = TestFunctions(W)

a = inner(grad(u), grad(v)) * dx - p * div(v) * dx + div(u) * q * dx

L = inner(f, v) * dx

But it gives me an attribute error on this line:

(u, p) = TrialFunctions(W)

Any ideas?