[PyGame] Snake controls not working

[jakegold98]

I have been following a class on udemy for pygame and were starting with this snake game. I get no errors but there has to be something I am missing in the code because the snake doesn't move with the controls I made, WASD, or the arrow keys. Hopefully someone can help me figure out why!

import pygame, sys, random, time

pygame.init()

# Play surface
playSurface = pygame.display.set_mode((720, 460))
pygame.display.set_caption('Snake')

# Colors
red   = pygame.Color(255, 0, 0) #gameover
green = pygame.Color(0, 255, 0) #snake
black = pygame.Color(0, 0, 0) #score 
white = pygame.Color(255, 255, 255) #background
gold  = pygame.Color(255, 215, 0) #food

#FPS Controller
fpsController = pygame.time.Clock()

#Important variables
snakePos  = [100, 50]
snakeBody = [[100, 50], [90, 50], [80, 50]]

foodPos   = [random.randrange(1,72)*10, random.randrange(1,46)*10]
foodSpawn = True

direction = 'RIGHT'
changeTo  = direction

#Game Over Function
def gameOver():
	myFont = pygame.font.SysFont('monaco', 72)
	GOsurf = myFont.render('You Suck', True, red)
	GOrect = GOsurf.get_rect()
	GOrect.midtop = ((360, 15))
	playSurface.blit(GOsurf, GOrect)
	pygame.display.update()
	time.sleep(5)
	pygame.QUIT() #pygame exit
	sys.exit() #console exit

#Main Logic
while True:
	for event in pygame.event.get():
		if event.type == pygame.QUIT:
			pygame.quit()
			sys.exit()
		elif event.type == pygame.KEYDOWN:
			if event.key == pygame.K_RIGHT or event.key == ord('d'):
				changeto = 'RIGHT'
			if event.key == pygame.K_LEFT or event.key == ord('a'):
				changeto = 'LEFT'
			if event.key == pygame.K_UP or event.key == ord('w'):
				changeto = 'UP'
			if event.key == pygame.K_DOWN or event.key == ord('s'):
				changeto = 'DOWN'
			if event.key == pygame.K_ESCAPE:
				pygame.event.post(pygame.event.event(QUIT))

	# validation of direction
	if changeTo == 'RIGHT' and not direction == 'LEFT':
		direction = 'RIGHT'  
	if changeTo == 'LEFT' and not direction == 'RIGHT':
		direction == 'LEFT'
	if changeTo == 'UP' and not direction == 'DOWN':
		direction == 'UP'        
	if changeTo == 'DOWN' and not direction == 'UP':
		direction == 'DOWN'    

	if direction == 'RIGHT':
		snakePos[0] += 10
	if direction == 'LEFT':
		snakePos[0] -= 10
	if direction == 'UP':
		snakePos[1] -= 10
	if direction == 'DOWN':
		snakePos[1] += 10

	# Snake body mechanics
	snakeBody.insert(0, list(snakePos))
	if snakePos[0] == foodPos[0] and snakePos[1] == foodPos[1]:
		foodSpawn = False
	else:
		snakeBody.pop()
	
	# Food spawn
	if foodSpawn == False:
		foodPos = [random.randrange(1,72)*10, random.randrange(1,46)*10]
	foodSpawn = True

	playSurface.fill(white)
	for pos in snakeBody:
		pygame.draw.rect(playSurface, green, pygame.Rect(pos[0], pos[1], 10, 10))



	pygame.display.update()
	fpsController.tick(25)