Tetris

import pygame, sys, random, time
from pygame.locals import *

pygame.init()

size = width, height = 400,600

screen = pygame.display.set_mode(size)

picked_letter = []

class Tetris_Maker(pygame.sprite.Sprite):
    def __init__(self, x, y, width, height, colour):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.Surface([width, height])
        self.image.fill(colour)

        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y
        self.colour = colour

def letters(x):
    if x == 0:
        picked_letter.append([["X","X"],
                              ["X","X"],
                              ["X","X"],
                              ["X","X"]])
    elif x == 1:
        picked_letter.append([["X","O"],
                              ["X","O"],
                              ["X","O"],
                              ["X","X"]])

width_divide = width / 40
height_divide = height / 50

Tetris_blocks = pygame.sprite.Group()


red = 255,0,0
blue = 0,0,255
black = 0,0,0
count = 0

YBegin = []
XBegin = []
adder = 0

recent = pygame.sprite.Group()
i = 0

while True:

    Tetris_blocks.empty()
    del picked_letter[:]
    
    x = random.randint(0,1)
    letters(x)
    
    time.sleep(2)
    
    if len(Tetris_blocks) == 0:
        for box in picked_letter:
            for x, row in enumerate(box):
                for y, cell in enumerate(row):
                    print cell
                    if cell == "X":
                        
                        new_block = Tetris_Maker(width_divide*y, height_divide*x, width_divide, height_divide, blue)
                        Tetris_blocks.add(new_block)
                        XBegin.append(x)
                     
                    elif cell == "O":
                        
                        new_block = Tetris_Maker(width_divide*y, height_divide*x, width_divide, height_divide, black)
                        Tetris_blocks.add(new_block)
                        XBegin.append(x)

                    recent.add(new_block)
    while True:
        for box in picked_letter:
            for x, row in enumerate(box):
                for y, cell in enumerate(row):
                    screen.fill(black)
                    if cell == "X":
                        x += 1
                        new_block = Tetris_Maker(width_divide*y, height_divide*x, width_divide, height_divide, blue)
                        Tetris_blocks.add(new_block)
                        
                    elif cell == "O":
                        x += 1
                        new_block = Tetris_Maker(width_divide*y, height_divide*x, width_divide, height_divide, black)
                        Tetris_blocks.add(new_block)
                       
                    i += 1
                    Tetris_blocks.draw(screen)
                    pygame.display.update()
                    time.sleep(1)
                    if x == 8:
                        break
    recent.empty()

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
            
    
    Tetris_blocks.draw(screen)
    pygame.display.update()