How to use the manimlib.mobject.types.vectorized_mobject.VGroup function in manimlib

result += self.use_to_mobjects(element)
        elif element.tagName == 'rect':
            result.append(self.rect_to_mobject(element))
        elif element.tagName == 'circle':
            result.append(self.circle_to_mobject(element))
        elif element.tagName == 'ellipse':
            result.append(self.ellipse_to_mobject(element))
        elif element.tagName in ['polygon', 'polyline']:
            result.append(self.polygon_to_mobject(element))
        else:
            pass  # TODO
            # warnings.warn("Unknown element type: " + element.tagName)
        result = [m for m in result if m is not None]
        self.handle_transforms(element, VGroup(*result))
        if len(result) > 1 and not self.unpack_groups:
            result = [VGroup(*result)]

        return result

def __init__(self, bubble, **kwargs):
        digest_config(self, kwargs)
        create_bubble = self.bubble_animation_class(
            bubble, *self.bubble_animation_args, **self.bubble_animation_kwargs
        )
        create_content = self.content_animation_class(
            VGroup(*bubble.content), *self.content_animation_args, **self.content_animation_kwargs
        )
        AnimationGroup.__init__(
            self, create_bubble, create_content, **kwargs
        )

def get_highlight_rectangles(self, n):
        return VGroup(*[
            self.get_highlight_rectangle(term_tex, k)
            for term_tex, k in zip(self.prod_tex[:-1], self.k_list[n])
        ])

def __init__(self, pi_creature=None, **kwargs):
        digest_config(self, kwargs)
        SVGMobject.__init__(self, file_name=self.file_name, **kwargs)
        self.stretch(self.y_stretch_factor, 1)
        self.set_height(self.height)
        self.set_stroke(width=0)
        self.set_fill(color=self.color)
        if pi_creature is not None:
            eyes = pi_creature.eyes
            self.set_height(3 * eyes.get_height())
            self.move_to(eyes, DOWN)
            self.shift(DOWN * eyes.get_height() / 4)


class Clock(VGroup):
    CONFIG = {}

    def __init__(self, **kwargs):
        circle = Circle(color=WHITE)
        ticks = []
        for x in range(12):
            alpha = x / 12.
            point = complex_to_R3(
                np.exp(2 * np.pi * alpha * complex(0, 1))
            )
            length = 0.2 if x % 3 == 0 else 0.1
            ticks.append(
                Line(point, (1 - length) * point)
            )
        self.hour_hand = Line(ORIGIN, 0.3 * UP)
        self.minute_hand = Line(ORIGIN, 0.6 * UP)

def g_to_mobjects(self, g_element):
        mob = VGroup(*self.get_mobjects_from(g_element))
        self.handle_transforms(g_element, mob)
        return mob.submobjects

-TAU / n_spikes / 2,
                    about_point=ORIGIN
                )
                layer.brown_index = index
            else:
                half_spikes = [
                    right_half_triangle.copy(),
                    left_half_triangle.copy().rotate(
                        90 * DEGREES, about_point=ORIGIN,
                    ),
                    right_half_triangle.copy().rotate(
                        90 * DEGREES, about_point=ORIGIN,
                    ),
                    left_half_triangle.copy()
                ]
                layer = VGroup(*it.chain(
                    half_spikes[:1],
                    full_spikes[1:index],
                    half_spikes[1:3],
                    full_spikes[index + 1:],
                    half_spikes[3:],
                ))
                layer.brown_index = index + 1

            layers.add(layer)

        # Color spikes
        blues = self.blue_spike_colors
        browns = self.brown_spike_colors
        for layer, blue, brown in zip(layers, blues, browns):
            index = layer.brown_index
            layer[:index].set_color(blue)

def vgroup_expansion(mobs):
    """Flatten a nested VGroup object ``mobs``."""
    while any(map(lambda x: isinstance(x, VGroup), mobs)):
        expanded_mobs = []
        for mob in mobs.submobjects:
            expanded_mobs.extend(mob)
        mobs = VGroup(expanded_mobs)
    return mobs

def get_times_symbols(self):
        return VGroup(*[term_tex[-1] for term_tex in self.prod_tex[:-1]])

def cut_pupil(self):
        pupil = self.pupil
        center = pupil.get_center()
        new_pupil = VGroup(*[
            pupil.copy().pointwise_become_partial(pupil, a, b)
            for (a, b) in [(0.25, 1), (0, 0.25)]
        ])
        for sector in new_pupil:
            sector.add_cubic_bezier_curve_to([
                sector.points[-1],
                *[center] * 3,
                *[sector.points[0]] * 2
            ])
        self.remove(pupil)
        self.add(new_pupil)
        self.pupil = new_pupil

def __init__(self, values, **kwargs):
        VGroup.__init__(self, **kwargs)
        if self.max_value is None:
            self.max_value = max(values)

        self.add_axes()
        self.add_bars(values)
        self.center()