importing libraries

import pygame import time import random

snake_speed = 15

Window size

window_x = 720 window_y = 480

defining colors

black = pygame.Color(0, 0, 0) white = pygame.Color(255, 255, 255) red = pygame.Color(255, 0, 0) green = pygame.Color(0, 255, 0) blue = pygame.Color(0, 0, 255)

Initialising pygame

pygame.init()

Initialise game window

pygame.display.set_caption('GeeksforGeeks Snakes') game_window = pygame.display.set_mode((window_x, window_y))

FPS (frames per second) controller

fps = pygame.time.Clock()

defining snake default position

snake_position = [100, 50]

defining first 4 blocks of snake body

snake_body = [[100, 50], [90, 50], [80, 50], [70, 50] ]

fruit position

fruit_position = [random.randrange(1, (window_x//10)) * 10, random.randrange(1, (window_y//10)) * 10]

fruit_spawn = True

setting default snake direction towards

right

direction = 'RIGHT' change_to = direction

initial score

score = 0

displaying Score function

def show_score(choice, color, font, size):

# creating font object score_font
score_font = pygame.font.SysFont(font, size)

# create the display surface object
# score_surface
score_surface = score_font.render('Score : ' + str(score), True, color)

# create a rectangular object for the text
# surface object
score_rect = score_surface.get_rect()

# displaying text
game_window.blit(score_surface, score_rect)

game over function

def game_over():

# creating font object my_font
my_font = pygame.font.SysFont('times new roman', 50)

# creating a text surface on which text
# will be drawn
game_over_surface = my_font.render(
    'Your Score is : ' + str(score), True, red)

# create a rectangular object for the text
# surface object
game_over_rect = game_over_surface.get_rect()

# setting position of the text
game_over_rect.midtop = (window_x/2, window_y/4)

# blit will draw the text on screen
game_window.blit(game_over_surface, game_over_rect)
pygame.display.flip()

# after 2 seconds we will quit the program
time.sleep(2)

# deactivating pygame library
pygame.quit()

# quit the program
quit()

Main Function

while True:

# handling key events
for event in pygame.event.get():
    if event.type == pygame.KEYDOWN:
        if event.key == pygame.K_UP:
            change_to = 'UP'
        if event.key == pygame.K_DOWN:
            change_to = 'DOWN'
        if event.key == pygame.K_LEFT:
            change_to = 'LEFT'
        if event.key == pygame.K_RIGHT:
            change_to = 'RIGHT'

# If two keys pressed simultaneously
# we don't want snake to move into two
# directions simultaneously
if change_to == 'UP' and direction != 'DOWN':
    direction = 'UP'
if change_to == 'DOWN' and direction != 'UP':
    direction = 'DOWN'
if change_to == 'LEFT' and direction != 'RIGHT':
    direction = 'LEFT'
if change_to == 'RIGHT' and direction != 'LEFT':
    direction = 'RIGHT'

# Moving the snake
if direction == 'UP':
    snake_position[1] -= 10
if direction == 'DOWN':
    snake_position[1] += 10
if direction == 'LEFT':
    snake_position[0] -= 10
if direction == 'RIGHT':
    snake_position[0] += 10

# Snake body growing mechanism
# if fruits and snakes collide then scores
# will be incremented by 10
snake_body.insert(0, list(snake_position))
if snake_position[0] == fruit_position[0] and snake_position[1] == fruit_position[1]:
    score += 10
    fruit_spawn = False
else:
    snake_body.pop()

if not fruit_spawn:
    fruit_position = [random.randrange(1, (window_x//10)) * 10,
                      random.randrange(1, (window_y//10)) * 10]

fruit_spawn = True
game_window.fill(black)

for pos in snake_body:
    pygame.draw.rect(game_window, green,
                     pygame.Rect(pos[0], pos[1], 10, 10))
pygame.draw.rect(game_window, white, pygame.Rect(
    fruit_position[0], fruit_position[1], 10, 10))

# Game Over conditions
if snake_position[0] < 0 or snake_position[0] > window_x-10:
    game_over()
if snake_position[1] < 0 or snake_position[1] > window_y-10:
    game_over()

# Touching the snake body
for block in snake_body[1:]:
    if snake_position[0] == block[0] and snake_position[1] == block[1]:
        game_over()

# displaying score countinuously
show_score(1, white, 'times new roman', 20)

# Refresh game screen
pygame.display.update()

# Frame Per Second /Refresh Rate
fps.tick(snake_speed)

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