game.py~

import pygame as pg
import random as rn

def overlap(x1,y1,x2,y2):
	return x1>=x2 and x1<=x2 + 0.9 and y1 >= y2 and y1<= y2+0.9 


pg.init()
screen = pg.display.set_mode((800,600), pg.HWSURFACE)
pg.font.init()
text = pg.font.SysFont('Liberation Mono',28,bold = True)
im = pg.image.load('game.png').convert_alpha()
bg = pg.image.load('bg.png').convert()
#apple
ax=5
ay=5
#ai = pg.image.load('apple.png').convert()

#worm
wx = [0,-1,-2]
wy = [0,0,0]
#wi = pg.image.load('snake.png').convert()
wl = 3
wd = (1,0)
for i in range(0,1000):
	wx.append(-1)
	wy.append(-1)
def setBit(i,j):
	if(wx[j]-wx[i]+25)%25==1:
		return 2
	if(wx[j]-wx[i]+25)%25==24:
		return 4
	if(wy[j]-wy[i]+19)%19==1:
		return 8
	if(wy[j]-wy[i]+19)%19==18:
		return 1
	return 0
Part = {10:0, 6:1, 12:2, 8:3, 4:4, 3:5, 9:7, 2:8, 1:9, 5: 12, 17:13, 18:14, 20:18, 24:19}
def part(n):
	if(n==0):
		code = setBit(n,n+1)
	elif(n==(wl-1)):
		code = setBit(n,n-1)+16
	else:
		code = setBit(n,n-1) + setBit(n,n+1)
	return (Part[code]%5*32, Part[code]//5*32, 32, 32)

#game controls
active = True
while active:
	for i in range(0,3):
		pg.event.pump()
		keys = pg.key.get_pressed()
		if(keys[pg.K_ESCAPE]):
			active=False
		elif keys[pg.K_RIGHT]:
			wd = (1,0)
		elif keys[pg.K_LEFT]:
			wd = (-1,0)
		elif keys[pg.K_UP]:
			wd = (0,-1)
		elif keys[pg.K_DOWN]:
			wd = (0,1)
		pg.time.Clock().tick(18)
	#update worm cell position
	for i in range(wl-1,0,-1):	
		wx[i]=wx[i-1]
		wy[i]=wy[i-1]
	wx[0]=(wx[0]+wd[0]+25)%25
	wy[0]=(wy[0]+wd[1]+19)%19
	
	#check overlap with apple
	for i in range(0,wl):
		if overlap(ax,ay,wx[i],wy[i]):
			ax = rn.randint(0,24)
			ay = rn.randint(0,17)
			wx[wl]=2*wx[wl-1]-wx[wl-2]
			wy[wl]=2*wy[wl-1]-wy[wl-2]
	
			wl = wl+1
	#check self overlap
	for i in range(2,wl):
		if(overlap(wx[0],wy[0],wx[i],wy[i])):
			print("GAME OVER")
			active = False

	#drawing and animation
	screen.blit(bg,(0,0))
	#screen.fill((0,0,0))
	scale=32
	for i in range(0, wl):
		screen.blit(im,(wx[i]*scale,wy[i]*scale),part(i))
	screen.blit(im,(ax*scale,ay*scale),(0,96,32,32))
	screen.blit(text.render('score: '+str(wl-3),False,(250,60,0)),(600,500))
	
	
	pg.display.flip()
print('score: ',wl-3)
pg.quit()