Correct this code : 
import pygame
import random

# Initialize Pygame
pygame.init()

# Screen dimensions
SCREEN_WIDTH = 300
SCREEN_HEIGHT = 600
BLOCK_SIZE = 30  # Size of the grid block

# Playable grid dimensions
GRID_WIDTH = SCREEN_WIDTH // BLOCK_SIZE
GRID_HEIGHT = SCREEN_HEIGHT // BLOCK_SIZE

# Define shapes and their rotations
SHAPES = [
    [['.....',
      '..0..',
      '..0..',
      '..0..',
      '..0..'],
     ['.....',
      '0000.',
      '.....',
      '.....',
      '.....']],

    [['.....',
      '..00.',
      '..00.',
      '.....',
      '.....']],

    [['.....',
      '...0.',
      '.000.',
      '.....',
      '.....'],
     ['.....',
      '..0..',
      '..0..',
      '..00.',
      '.....'],
     ['.....',
      '.....',
      '.000.',
      '.0...',
      '.....'],
     ['.....',
      '.00..',
      '..0..',
      '..0..',
      '.....']],

    [['.....',
      '.0...',
      '.000.',
      '.....',
      '.....'],
     ['.....',
      '..00.',
      '..0..',
      '..0..',
      '.....'],
     ['.....',
      '.....',
      '.000.',
      '...0.',
      '.....'],
     ['.....',
      '..0..',
      '..0..',
      '.00..',
      '.....']],

    [['.....',
      '..0..',
      '.000.',
      '.....',
      '.....'],
     ['.....',
      '..0..',
      '..00.',
      '..0..',
      '.....'],
     ['.....',
      '.....',
      '.000.',
      '..0..',
      '.....'],
     ['.....',
      '..0..',
      '.00..',
      '..0..',
      '.....']],

    [['.....',
      '..0..',
      '..00.',
      '...0.',
      '.....'],
     ['.....',
      '...00',
      '..00.',
      '.....',
      '.....']],

    [['.....',
      '...0.',
      '..00.',
      '..0..',
      '.....'],
     ['.....',
      '..00.',
      '...00',
      '.....',
      '.....']]
]

# Define colors for each shape
SHAPE_COLORS = [
    (0, 255, 255),   # Cyan
    (255, 255, 0),   # Yellow
    (255, 165, 0),   # Orange
    (0, 0, 255),     # Blue
    (128, 0, 128),   # Purple
    (0, 255, 0),     # Green
    (255, 0, 0)      # Red
]

class Piece:
    def init(self, x, y, shape):
        self.x = x
        self.y = y
        self.shape = shape
        self.color = SHAPE_COLORS[SHAPES.index(shape)]
        self.rotation = 0

def create_grid(locked_positions={}):
    grid = [[(0, 0, 0) for _ in range(GRID_WIDTH)] for _ in range(GRID_HEIGHT)]

    for i in range(GRID_HEIGHT):
        for j in range(GRID_WIDTH):
            if (j, i) in locked_positions:
                c = locked_positions[(j, i)]
                grid[i][j] = c
    return grid

def convert_shape_format(piece):
    positions = []
    shape = piece.shape[piece.rotation % len(piece.shape)]

    for i, line in enumerate(shape):
        row = list(line)
        for j, column in enumerate(row):
            if column == '0':
                positions.append((piece.x + j - 2, piece.y + i - 4))

    return positions

def valid_space(piece, grid):
    accepted_positions = [[(j, i) for j in range(GRID_WIDTH) if grid[i][j] == (0, 0, 0)] for i in range(GRID_HEIGHT)]
    accepted_positions = [j for sub in accepted_positions for j in sub]

    formatted = convert_shape_format(piece)

    for pos in formatted:
        if pos not in accepted_positions:
            if pos[1] > -1:
                return False
    return True

def check_lost(positions):
    for pos in positions:
        x, y = pos
        if y < 1:
            return True
    return False

def get_shape():
    return Piece(GRID_WIDTH // 2, 0, random.choice(SHAPES))

def draw_text_middle(text, size, color, surface):
    font = pygame.font.SysFont('comicsans', size, bold=True)
    label = font.render(text, 1, color)

    surface.blit(label, (SCREEN_WIDTH / 2 - label.get_width() / 2, SCREEN_HEIGHT / 2 - label.get_height() / 2))

def draw_grid(surface, grid):
    for i in range(GRID_HEIGHT):
        pygame.draw.line(surface, (128, 128, 128), (0, i * BLOCK_SIZE), (SCREEN_WIDTH, i * BLOCK_SIZE))
        for j in range(GRID_WIDTH):
            pygame.draw.line(surface, (128, 128, 128), (j * BLOCK_SIZE, 0), (j * BLOCK_SIZE, SCREEN_HEIGHT))

def clear_rows(grid, locked):
    inc = 0
    for i in range(len(grid) - 1, -1, -1):
        row = grid[i]
        if (0, 0, 0) not in row:
            inc += 1
            ind = i
            for j in range(len(row)):
                try:
                    del locked[(j, i)]
                except:
                    continue
    if inc > 0:
        for key in sorted(list(locked), key=lambda x: x[1])[::-1]:
            x, y = key
            if y < ind:
                newKey = (x, y + inc)
                locked[newKey] = locked.pop(key)

def draw_next_shape(piece, surface):
    font = pygame.font.SysFont('comicsans', 30)
    label = font.render('Next Shape', 1, (255, 255, 255))

    sx = SCREEN_WIDTH + 10
    sy = SCREEN_HEIGHT / 2 - 100
    format = piece.shape[piece.rotation % len(piece.shape)]

    for i, line in enumerate(format):
        row = list(line)
        for j, column in enumerate(row):
            if column == '0':
                pygame.draw.rect(surface, piece.color, (sx + j * BLOCK_SIZE, sy + i * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE), 0)

    surface.blit(label, (sx + 10, sy - 30))

def draw_window(surface, grid):
    surface.fill((0, 0, 0))
    font = pygame.font.SysFont('comicsans', 60)
    label = font.render('Tetris', 1, (255, 255, 255))

    surface.blit(label, (SCREEN_WIDTH / 2 - label.get_width() / 2, 30))

    for i in range(len(grid)):
        for j in range(len(grid[i])):
            pygame.draw.rect(surface, grid[i][j], (j * BLOCK_SIZE, i * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE), 0)

    draw_grid(surface, grid)
    pygame.display.update()

def main():
    locked_positions = {}
    grid = create_grid(locked_positions)

    change_piece = False
    run = True
    current_piece = get_shape()
    next_piece = get_shape()
    clock = pygame.time.Clock()
    fall_time = 0

    fall_speed = 0.5  # Adjust to make pieces fall faster or slower

    while run:
        grid = create_grid(locked_positions)
        fall_time += clock.get_rawtime()
        clock.tick()

        if fall_time / 1000 >= fall_speed:
            fall_time = 0
            current_piece.y += 1
            if not valid_space(current_piece, grid) and current_piece.y > 0:
                current_piece.y -= 1
                change_piece = True

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False
                pygame.display.quit()
                quit()

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    current_piece.x -= 1
                    if not valid_space(current_piece, grid):
                        current_piece.x += 1
                elif event.key == pygame.K_RIGHT:
                    current_piece.x += 1
                    if not valid_space(current_piece, grid):
                        current_piece.x -= 1
                elif event.key == pygame.K_DOWN:
                    current_piece.y += 1
                    if not valid_space(current_piece, grid):
                        current_piece.y -= 1
                elif event.key == pygame.K_UP:
                    current_piece.rotation += 1
                    if not valid_space(current_piece, grid):
                        current_piece.rotation -= 1

        shape_pos = convert_shape_format(current_piece)

        for i in range(len(shape_pos)):
            x, y = shape_pos[i]
            if y > -1:
                grid[y][x] = current_piece.color

        if change_piece:
            for pos in shape_pos:
                p = (pos[0], pos[1])
                locked_positions[p] = current_piece.color
            current_piece = next_piece
            next_piece = get_shape()
            change_piece = False

            clear_rows(grid, locked_positions)

        draw_window(win, grid)
        draw_next_shape(next_piece, win)
        pygame.display.update()

        if check_lost(locked_positions):
            draw_text_middle("YOU LOST!", 80, (255, 255, 255), win)
            pygame.display.update()
            pygame.time.delay(2000)
            run = False

def main_menu():
    run = True
    while run:
        win.fill((0, 0, 0))
        draw_text_middle('Press Any Key To Play', 60, (255, 255, 255), win)
        pygame.display.update()
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False
            if event.type == pygame.KEYDOWN:
                main()
    pygame.quit()

win = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption('Tetris')

if name == 'main':
    main_menu()


Error : 
C:\Users\Chris\source\repos\Tetris>python tetris.py
pygame 2.6.0 (SDL 2.28.4, Python 3.11.3)
Hello from the pygame community. https://www.pygame.org/contribute.html
Traceback (most recent call last):
  File "C:\Users\Christian\source\repos\Tetris\tetris.py", line 337, in <module>
    if name == 'main':
       ^^^^
NameError: name 'name' is not defined