human
I wrote the below code

    def myfunc(alpha):
        return func((p + (alpha * xi)))
    (alpha_min, fret, iter, num) = brent(myfunc, full_output=1, tol=tol)
    xi = (alpha_min * xi)
    return (squeeze(fret), (p + xi), xi)

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

def _linesearch_powell(func, p, xi, tol=0.001):