How to use the meshio.pymeshio.mmd.Vector3 function in meshio

def parseBone(self, name):
        bone=MotionData(name)
        self.pose.append(bone)
        bone.pos=Vector3(*[float(token) for token in self.readline().split(';')[0].split(',')])
        bone.q=Quaternion(*[float(token) for token in self.readline().split(';')[0].split(',')])
        return self.readline()=="}"

def __init__(self, x=0, y=0, z=0, nx=0, ny=0, nz=0, u=0, v=0,
            bone0=0, bone1=0, weight0=0, edge_flag=0):
        self.pos=Vector3(x, y, z)
        self.normal=Vector3(nx, ny, nz)
        self.uv=Vector2(u, v)
        self.bone0=bone0
        self.bone1=bone1
        self.weight0=weight0
        self.edge_flag=edge_flag

def _loadBone(self):
        size = struct.unpack("H", self.io.read(2))[0]
        for i in xrange(size):
            name=truncate_zero(struct.unpack("20s", self.io.read(20))[0])
            parent_index, tail_index = struct.unpack("HH", self.io.read(4))
            type = struct.unpack("B", self.io.read(1))[0]
            bone=createBone(name, type)
            bone.parent_index=parent_index
            bone.tail_index=tail_index
            bone.ik_index = struct.unpack("H", self.io.read(2))[0]
            bone.pos = Vector3(*struct.unpack("3f", self.io.read(12)))
            bone.english_name="bone%03d" % len(self.bones)
            self.bones.append(bone)
        return True

def __init__(self, name):
        self.name=name
        self.frame=-1
        self.pos=Vector3()
        self.q=Quaternion()

def __init__(self, name='bone', type=0):
        self.name=name
        self.index=0
        self.type=type
        self.parent_index=0xFFFF
        self.tail_index=0
        self.tail=Vector3(0, 0, 0)
        self.parent=None
        self.ik_index=0xFFFF
        self.pos=Vector3(0, 0, 0)
        self.children=[]
        self.english_name=''

def __init__(self, name='bone', type=0):
        self.name=name
        self.index=0
        self.type=type
        self.parent_index=0xFFFF
        self.tail_index=0
        self.tail=Vector3(0, 0, 0)
        self.parent=None
        self.ik_index=0xFFFF
        self.pos=Vector3(0, 0, 0)
        self.children=[]
        self.english_name=''

def _loadSkin(self):
        size = struct.unpack("H", self.io.read(2))[0]
        for i in xrange(size):
            skin=Skin(truncate_zero(struct.unpack("20s", self.io.read(20))[0]))
            skin_size = struct.unpack("I", self.io.read(4))[0]
            skin.type = struct.unpack("B", self.io.read(1))[0]
            for j in xrange(skin_size):
                skin.indices.append(struct.unpack("I", self.io.read(4))[0])
                skin.pos_list.append(
                        Vector3(*struct.unpack("3f", self.io.read(12))))
            skin.english_name="skin%03d" % len(self.morph_list)
            self.morph_list.append(skin)
        return True