How to use the vpython.scene function in vpython

try:
                    if self.full or not self.label.visible:
                        return False
                    if self.last_clicked is not None:
                        return (time.time() - self.last_clicked) < 0.5
                    return False
                finally:
                    self.last_clicked = time.time()

            def action(self):
                self.label.visible ^= 1
                if self.full:
                    self.unfull()

        vpython.scene = vpython.canvas()
        vpython.scene.title = "<center><u><b>%s</b></u></center>" % self.listname  # noqa: E501
        vpython.scene.append_to_caption(
            re.sub(
                r'\%(.*)\%',
                r'<span style="color: red">\1</span>',
                re.sub(
                    r'\`(.*)\`',
                    r'<span style="color: #3399ff">\1</span>',
                    """<u><b>Commands:</b></u>
%Click% to toggle information about a node.
%Double click% to perform a quick web scan on this node.
<u><b>Camera usage:</b></u>
`Right button drag or Ctrl-drag` to rotate "camera" to view scene.
`Shift-drag` to move the object around.
`Middle button or Alt-drag` to drag up or down to zoom in or out.
  On a two-button mouse, `middle is wheel or left + right`.
Touch screen: pinch/extend to zoom, swipe or two-finger rotate."""

#
        # vpython.scene.bind('keydown', keyboard_press)

        # Mouse handling
        def mouse_click(ev):
            if ev.press == "left":
                o = vpython.scene.mouse.pick
                if o and isinstance(o, IPsphere):
                    if o.check_double_click():
                        if o.ip == "unk":
                            return
                        o.fullinfos()
                    else:
                        o.action()

        vpython.scene.bind('mousedown', mouse_click)

try:
                    if self.full or not self.label.visible:
                        return False
                    if self.last_clicked is not None:
                        return (time.time() - self.last_clicked) < 0.5
                    return False
                finally:
                    self.last_clicked = time.time()

            def action(self):
                self.label.visible ^= 1
                if self.full:
                    self.unfull()

        vpython.scene = vpython.canvas()
        vpython.scene.title = "<center><u><b>%s</b></u></center>" % self.listname  # noqa: E501
        vpython.scene.append_to_caption(
            re.sub(
                r'\%(.*)\%',
                r'<span style="color: red">\1</span>',
                re.sub(
                    r'\`(.*)\`',
                    r'<span style="color: #3399ff">\1</span>',
                    """<u><b>Commands:</b></u>
%Click% to toggle information about a node.
%Double click% to perform a quick web scan on this node.
<u><b>Camera usage:</b></u>
`Right button drag or Ctrl-drag` to rotate "camera" to view scene.
`Shift-drag` to move the object around.
`Middle button or Alt-drag` to drag up or down to zoom in or out.
  On a two-button mouse, `middle is wheel or left + right`.
Touch screen: pinch/extend to zoom, swipe or two-finger rotate."""

def mouse_click(ev):
            if ev.press == "left":
                o = vpython.scene.mouse.pick
                if o and isinstance(o, IPsphere):
                    if o.check_double_click():
                        if o.ip == "unk":
                            return
                        o.fullinfos()
                    else:
                        o.action()

def hook6(lattice):
    draw(lattice)
    # Toggle visibility
    visible = dict()
    for L in lattice.vpobjects:
        visible[L] = False
    visible['l'] = True
    while True:
        ev = vp.scene.waitfor("keydown")
        if ev.key in lattice.vpobjects:
            for L in lattice.vpobjects[ev.key]:
                L.visible = visible[ev.key]
            visible[ev.key] = not visible[ev.key]

def mouse_click(ev):
            if ev.press == "left":
                o = vpython.scene.mouse.pick
                if o and isinstance(o, IPsphere):
                    if o.check_double_click():
                        if o.ip == "unk":
                            return
                        o.fullinfos()
                    else:
                        o.action()

def check_double_click(self):
                try:
                    if self.full or not self.label.visible:
                        return False
                    if self.last_clicked is not None:
                        return (time.time() - self.last_clicked) < 0.5
                    return False
                finally:
                    self.last_clicked = time.time()

            def action(self):
                self.label.visible ^= 1
                if self.full:
                    self.unfull()

        vpython.scene = vpython.canvas()
        vpython.scene.title = "<center><u><b>%s</b></u></center>" % self.listname  # noqa: E501
        vpython.scene.append_to_caption(
            re.sub(
                r'\%(.*)\%',
                r'<span style="color: red">\1</span>',
                re.sub(
                    r'\`(.*)\`',
                    r'<span style="color: #3399ff">\1</span>',
                    """<u><b>Commands:</b></u>
%Click% to toggle information about a node.
%Double click% to perform a quick web scan on this node.
<u><b>Camera usage:</b></u>
`Right button drag or Ctrl-drag` to rotate "camera" to view scene.
`Shift-drag` to move the object around.
`Middle button or Alt-drag` to drag up or down to zoom in or out.
  On a two-button mouse, `middle is wheel or left + right`.

re.sub(
                    r'\`(.*)\`',
                    r'<span style="color: #3399ff">\1</span>',
                    """<u><b>Commands:</b></u>
%Click% to toggle information about a node.
%Double click% to perform a quick web scan on this node.
<u><b>Camera usage:</b></u>
`Right button drag or Ctrl-drag` to rotate "camera" to view scene.
`Shift-drag` to move the object around.
`Middle button or Alt-drag` to drag up or down to zoom in or out.
  On a two-button mouse, `middle is wheel or left + right`.
Touch screen: pinch/extend to zoom, swipe or two-finger rotate."""
                )
            )
        )
        vpython.scene.exit = True
        start = vpython.box()
        rings = {}
        tr3d = {}
        for i in trace:
            tr = trace[i]
            tr3d[i] = []
            for t in range(1, max(tr) + 1):
                if t not in rings:
                    rings[t] = []
                if t in tr:
                    if tr[t] not in rings[t]:
                        rings[t].append(tr[t])
                    tr3d[i].append(rings[t].index(tr[t]))
                else:
                    rings[t].append(("unk", -1))
                    tr3d[i].append(len(rings[t]) - 1)

if self.full or not self.label.visible:
                        return False
                    if self.last_clicked is not None:
                        return (time.time() - self.last_clicked) < 0.5
                    return False
                finally:
                    self.last_clicked = time.time()

            def action(self):
                self.label.visible ^= 1
                if self.full:
                    self.unfull()

        vpython.scene = vpython.canvas()
        vpython.scene.title = "<center><u><b>%s</b></u></center>" % self.listname  # noqa: E501
        vpython.scene.append_to_caption(
            re.sub(
                r'\%(.*)\%',
                r'<span style="color: red">\1</span>',
                re.sub(
                    r'\`(.*)\`',
                    r'<span style="color: #3399ff">\1</span>',
                    """<u><b>Commands:</b></u>
%Click% to toggle information about a node.
%Double click% to perform a quick web scan on this node.
<u><b>Camera usage:</b></u>
`Right button drag or Ctrl-drag` to rotate "camera" to view scene.
`Shift-drag` to move the object around.
`Middle button or Alt-drag` to drag up or down to zoom in or out.
  On a two-button mouse, `middle is wheel or left + right`.
Touch screen: pinch/extend to zoom, swipe or two-finger rotate."""
                )

def check_double_click(self):
                try:
                    if self.full or not self.label.visible:
                        return False
                    if self.last_clicked is not None:
                        return (time.time() - self.last_clicked) < 0.5
                    return False
                finally:
                    self.last_clicked = time.time()

            def action(self):
                self.label.visible ^= 1
                if self.full:
                    self.unfull()

        vpython.scene = vpython.canvas()
        vpython.scene.title = "<center><u><b>%s</b></u></center>" % self.listname  # noqa: E501
        vpython.scene.append_to_caption(
            re.sub(
                r'\%(.*)\%',
                r'<span style="color: red">\1</span>',
                re.sub(
                    r'\`(.*)\`',
                    r'<span style="color: #3399ff">\1</span>',
                    """<u><b>Commands:</b></u>
%Click% to toggle information about a node.
%Double click% to perform a quick web scan on this node.
<u><b>Camera usage:</b></u>
`Right button drag or Ctrl-drag` to rotate "camera" to view scene.
`Shift-drag` to move the object around.
`Middle button or Alt-drag` to drag up or down to zoom in or out.
  On a two-button mouse, `middle is wheel or left + right`.