snake_v1

import pygame

SIZE_BLOCK = []
WHITE = (255, 255, 255)
BLUE = (204, 255, 255)
FRAME_COLOR = (0, 255, 204)
COUNT_BLOCKS = 20

size = [400, 600]
MARGIN = 1
SIZE_BLOCK = 20
screen = pygame.display.set_mode(size)
pygame.display.set_caption('Змейка')

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            print('exit')
            pygame.quit()

    screen.fill(FRAME_COLOR)

    for row in range(COUNT_BLOCKS):
        for column in range(COUNT_BLOCKS):
            if (column + row) % 2 == 0:
                color = BLUE
            else:
                color = WHITE
            pygame.draw.rect(screen, color, [10 + column * SIZE_BLOCK + MARGIN * (column + 1),
                                             20 + row * SIZE_BLOCK + MARGIN * (row + 1), SIZE_BLOCK, SIZE_BLOCK])

    pygame.display.flip()