human
Here's a good function header given the following:
I wrote the below code

    J = aslinearoperator(J)
    (m, n) = J.shape
    def matvec(x):
        return np.hstack((J.matvec(x), (diag * x)))
    def rmatvec(x):
        x1 = x[:m]
        x2 = x[m:]
        return (J.rmatvec(x1) + (diag * x2))
    return LinearOperator(((m + n), n), matvec=matvec, rmatvec=rmatvec)

What's a good function header?
assistant
#Here's a good function header.

def regularized_lsq_operator(J, diag):