PyOpenGL 3D Snake Game' can't seem to find a way to increment the snake segments

Question

i have recently started working with the pyopengl library and to test my knowledge i have decided to make a game. I have been having some issues with finishing the last part of the game tho, adding segments to the snake/making them follow you, down below you can find the source code of the game, there is a multilined comment, that's what i've tried doing and it didn't work, would appreciate any help if possible.

import random

import pygame
from pygame.locals import *

from OpenGL.GL import *
from OpenGL.GLU import *


pygame.init()

edges = (
    (0, 1),
    (2, 1),
    (2, 3),
    (2, 7),
    (6, 3),
    (6, 4),
    (6, 7),
    (5, 1),
    (5, 4),
    (5, 7),
    (0, 3),
    (0, 4)
)

surfaces = (
    (0,1,2,3),
    (3,2,7,6),
    (6,7,5,4),
    (4,5,1,0),
    (1,5,7,2),
    (4,0,3,6)
)

colors = (
    (1,0,0),
    (0,1,0),
    (0,0,1),
    (0,0,0),
    (1,1,1),
    (0,1,1),
    (1,0,0),
    (0,1,0),
    (0,0,1),
    (0,0,0),
    (1,1,1),
    (0,1,1)
)

def Cube(InputX, InputY, InputZ, color):
    verticies = (
        (InputX + 1, InputY + -1, InputZ + -1),
        (InputX + 1, InputY + 1, InputZ + -1),
        (InputX + -1, InputY + 1, InputZ + -1),
        (InputX + -1, InputY + -1, InputZ + -1),
        (InputX + 1, InputY + -1, InputZ + 1),
        (InputX + 1, InputY + 1, InputZ + 1),
        (InputX + -1, InputY + -1, InputZ + 1),
        (InputX + -1, InputY + 1, InputZ + 1)
    )
    glBegin(GL_QUADS)
    for surface in surfaces:
        x = 0
        for vortex in surface:
            x += 1
            glColor3fv(colors[color])
            glVertex3fv(verticies[vortex])
    glEnd()


    glBegin(GL_LINES)
    for edge in edges:
        for vertex in edge:
            glColor3fv(colors[10])
            glVertex3fv(verticies[vertex])
    glEnd()


headx = 0
heady = 0
RandX = random.randint(0, 28/2)  * 2
RandY = random.randint(0, 28/2) * 2


grid = [[0] * 10 for x in range(9)]


display = (750, 800)
screen = pygame.display.set_mode(display, DOUBLEBUF|OPENGL)

gluPerspective(120, (display[0] / display[1]), 0.1, 50.0)

#First image to display
glTranslatef(-13, -13, -10)
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
Cubes = [[Cube(2*x,2*y, -5, 9) for x in range(15)] for y in range(15)]#Grid
Cube(headx, heady, -5, 1)
Cube(RandX, RandY, -5, 6)
pygame.display.flip()


dir = (0, 0)
MOVEEVENT, t = pygame.USEREVENT+1, 1
pygame.time.set_timer(MOVEEVENT, t)
Score = 0
Time = -1000

TailPos = [[3,3], [2,3]]


while True:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()

    keys = pygame.key.get_pressed()
    if keys[pygame.K_w]: dir = (0, -1)
    if keys[pygame.K_a]: dir = (-1, 0)
    if keys[pygame.K_s]: dir = (0, 1)
    if keys[pygame.K_d]: dir = (1, 0)

    for e in pygame.event.get():
        if e.type == MOVEEVENT:  # is called every 't' milliseconds
            if(dir == (0, -1)):
                heady += 2
            elif (dir == (-1, 0)):
                headx -= 2
            elif (dir == (0, 1)):
                heady -= 2
            elif (dir == (1, 0)):
                headx += 2



        if (headx >= 30): # checking if the snake is going out of bounds
            headx = 0
        elif (headx <= -1):
            headx = 28
        elif (heady >= 30):
            heady = 0
        elif (heady <= -1):
            heady = 28

        if((headx == RandX) and (heady == RandY)):
            RandX, RandY = random.randint(0, 28/2) * 2, random.randint(0, 28/2) * 2
            Score += 10
            #if(Time > 10):
            #    Time -= 10
            #    print(Time)
        '''for i in range(len(TailPos) - 1, 0, -1):
            TailPos[i][0] = TailPos[i - 1][0];
            TailPos[i][1] = TailPos[i - 1][1];
            for j in range(len(TailPos)-1):
                Cube(TailPos[i][j], TailPos[i][j], -5, 1)  # Snake
        for x in range(len(TailPos)):
            for segment in TailPos:
                for part in segment:
                    Cube(part,part, -5, 1)'''

        glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
        Cubes = [[Cube(2*x,2*y, -5, 9) for x in range(15)] for y in range(15)]#Grid



        Cube(RandX, RandY, -5, 6)#Fruit
        Cube(headx, heady, -5, 1)  # Snake

        pygame.time.wait(Time)
        pygame.display.flip()