main.py

# SNAKES GAME
# Use ARROW KEYS to play, SPACE BAR for pausing/resuming and Esc Key for exiting
import curses
from curses import KEY_RIGHT, KEY_LEFT, KEY_UP, KEY_DOWN
from random import randint

curses.initscr()
win = curses.newwin(20, 60, 0, 0)
win.keypad(1)
curses.noecho()
curses.curs_set(0)
win.border(0)
win.nodelay(1)
# Initializing values
key = KEY_RIGHT 
score = 0
# Initial snake co-ordinates
snake = [[4,10], [4,9], [4,8]] 
# First food co-ordinates     
food = [10,20]      
# Prints the food
win.addch(food[0], food[1], '*')        

# While Esc key is not pressed
while key != 27:     
  win.border(0)
  #Printing 'Score' and strings
  win.addstr(0, 2, 'Score : ' + str(score) + ' ')                
  win.addstr(0, 27, ' SNAKE ')
  # Increases the speed of Snake as its length increases
  win.timeout(150 - int((len(snake)/5) + int(len(snake)/10)%120))          
  # Previous key pressed
  prevKey = key                                                 
  event = win.getch()
  key = key if event == -1 else event 

  #If SPACE BAR is pressed, wait for another
  if key == ord(' '): 
      #Pause/Resume                                          
      key = -1                                                   
      while key != ord(' '):
        key = win.getch()
      key = prevKey
      continue
  # If an invalid key is pressed
  if key not in [KEY_LEFT, KEY_RIGHT, KEY_UP, KEY_DOWN, 27]:     
    key = prevKey

  # Calculates the new coordinates of the head of the snake. 
  snake.insert(0, [snake[0][0] + (key == KEY_DOWN and 1) + (key == KEY_UP and -1), snake[0][1] + (key == KEY_LEFT and -1) + (key == KEY_RIGHT and 1)])

  #If snake crosses the boundaries, make it enter from the other side
  if snake[0][0] == 0: 
    snake[0][0] = 18
  if snake[0][1] == 0: 
    snake[0][1] = 58
  if snake[0][0] == 19: 
    snake[0][0] = 1
  if snake[0][1] == 59: 
    snake[0][1] = 1
  #Exit if snake crosses the boundaries
  if snake[0][0] == 0 or snake[0][0] == 19 or snake[0][1] == 0 or snake[0][1] == 59: 
    break
  #If snake runs over itself
  if snake[0] in snake[1:]: 
    break 
  #When snake eats the food   
  if snake[0] == food:
    food = []
    score += 1
    while food == []:
      #Calculating next food's coordinates
      food = [randint(1, 18), randint(1, 58)]                
      if food in snake: food = []
    win.addch(food[0], food[1], '*')
  else:
    #If it does not eat the food, length decreases    
    last = snake.pop()                                          
    win.addch(last[0], last[1], ' ')
  win.addch(snake[0][0], snake[0][1], '#')   
curses.endwin()
print("\nScore - " + str(score))