How to use the svgpathtools.polytools.polyroots01 function in svgpathtools

def bezier_radialrange(seg, origin, return_all_global_extrema=False):
    """returns the tuples (d_min, t_min) and (d_max, t_max) which minimize and
    maximize, respectively, the distance d = |self.point(t)-origin|.
    return_all_global_extrema:  Multiple such t_min or t_max values can exist.
    By default, this will only return one. Set return_all_global_extrema=True
    to return all such global extrema."""

    def _radius(tau):
        return abs(seg.point(tau) - origin)

    shifted_seg_poly = seg.poly() - origin
    r_squared = real(shifted_seg_poly) ** 2 + \
                imag(shifted_seg_poly) ** 2
    extremizers = [0, 1] + polyroots01(r_squared.deriv())
    extrema = [(_radius(t), t) for t in extremizers]

    if return_all_global_extrema:
        raise NotImplementedError
    else:
        seg_global_min = min(extrema, key=itemgetter(0))
        seg_global_max = max(extrema, key=itemgetter(0))
        return seg_global_min, seg_global_max

for x in x_values:
                for y in y_values:
                    p = complex(x, y) + self.center
                    my_t = self.point_to_t(p)
                    if my_t == None:
                        continue
                    other_t = other_seg.point_to_t(p)
                    if other_t == None:
                        continue
                    intersections.append([my_t, other_t])
            return intersections

        elif is_bezier_segment(other_seg):
            u1poly = self.u1transform(other_seg.poly())
            u1poly_mag2 = real(u1poly)**2 + imag(u1poly)**2
            t2s = polyroots01(u1poly_mag2 - 1)
            t1s = [self.phase2t(phase(u1poly(t2))) for t2 in t2s]
            return list(zip(t1s, t2s))
        elif isinstance(other_seg, Arc):
            assert other_seg != self
            # This could be made explicit to increase efficiency
            longer_length = max(self.length(), other_seg.length())
            inters = bezier_intersections(self, other_seg,
                                          longer_length=longer_length,
                                          tol=tol, tol_deC=tol)

            # ad hoc fix for redundant solutions
            if len(inters) > 2:
                def keyfcn(tpair):
                    t1, t2 = tpair
                    return abs(self.point(t1) - other_seg.point(t2))
                inters.sort(key=keyfcn)