human
I wrote the below code

    A = _asarray_square(A)
    def rounded_sign(x):
        rx = np.real(x)
        if (rx.dtype.char == 'f'):
            c = ((1000.0 * feps) * amax(x))
        else:
            c = ((1000.0 * eps) * amax(x))
        return sign(((absolute(rx) > c) * rx))
    (result, errest) = funm(A, rounded_sign, disp=0)
    errtol = {0: (1000.0 * feps), 1: (1000.0 * eps)}[_array_precision[result.dtype.char]]
    if (errest < errtol):
        return result
    vals = svd(A, compute_uv=0)
    max_sv = np.amax(vals)
    c = (0.5 / max_sv)
    S0 = (A + (c * np.identity(A.shape[0])))
    prev_errest = errest
    for i in range(100):
        iS0 = inv(S0)
        S0 = (0.5 * (S0 + iS0))
        Pp = (0.5 * (dot(S0, S0) + S0))
        errest = norm((dot(Pp, Pp) - Pp), 1)
        if ((errest < errtol) or (prev_errest == errest)):
            break
        prev_errest = errest
    if disp:
        if ((not isfinite(errest)) or (errest >= errtol)):
            print('signm    result    may    be    inaccurate,    approximate    err    =', errest)
        return S0
    else:
        return (S0, errest)

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

def signm(A, disp=True):