8.9: The main() Function

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def main():
    global FPSCLOCK, DISPLAYSURF, BASICFONT, BIGFONT
    pygame.init()
    FPSCLOCK = pygame.time.Clock()
    DISPLAYSURF = pygame.display.set_mode((WINDOWWIDTH, WINDOWHEIGHT))
    BASICFONT = pygame.font.Font('freesansbold.ttf', 18)
    BIGFONT = pygame.font.Font('freesansbold.ttf', 100)
    pygame.display.set_caption('Tetromino')

    showTextScreen('Tetromino')
    while True: # game loop
        if random.randint(0, 1) == 0:
            pygame.mixer.music.load('tetrisb.mid')
        else:
            pygame.mixer.music.load('tetrisc.mid')
        pygame.mixer.music.play(-1, 0.0)
        runGame()
        pygame.mixer.music.stop()
        showTextScreen('Game Over')

The main() function handles creating some more global constants and showing the start screen that appears when the program is run.

The code for the actual game is all in runGame(). The main() function here simply randomly decides what background music to start playing (either the tetrisb.mid or tetrisc.mid MIDI music file), then calls runGame() to begin the game. When the player loses, runGame() will return to main(), which then stops the background music and displays the game over screen.

When the player presses a key, the showTextScreen() function that displays the game over screen will return. The game loop will loop back to the beginning at line 12 [169] and start another game.