Python learning:
# Source Code
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('Snakes Master')
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 posiiton
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

# inital 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 wil 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(white)

for pos in snake_body:
pygame.draw.rect(game_window, black,