在这个简单的游戏中导致延迟的原因是什么？

Question

我有一个 pygame 程序的经典示例：

import pygame
import random

# Define some colors
BLACK = (  0,   0,   0)
WHITE = (255, 255, 255)
RED   = (255,   0,   0)

class Block(pygame.sprite.Sprite):
    """
    This class represents the ball.
    It derives from the "Sprite" class in Pygame.
    """

    def __init__(self, color, width, height):
        """ Constructor. Pass in the color of the block,
        and its x and y position. """

        # Call the parent class (Sprite) constructor
        pygame.sprite.Sprite.__init__(self)

        # Create an image of the block, and fill it with a color.
        # This could also be an image loaded from the disk.
        self.image = pygame.Surface([width, height])
        self.image.fill(color)

        # Fetch the rectangle object that has the dimensions of the image
        # image.
        # Update the position of this object by setting the values
        # of rect.x and rect.y
        self.rect = self.image.get_rect()

# Initialize Pygame
pygame.init()

# Set the height and width of the screen
screen_width = 700
screen_height = 400
screen = pygame.display.set_mode([screen_width, screen_height])

# This is a list of 'sprites.' Each block in the program is
# added to this list. The list is managed by a class called 'Group.'
block_list = pygame.sprite.Group()

# This is a list of every sprite. 
# All blocks and the player block as well.
all_sprites_list = pygame.sprite.Group()

for i in range(100):
    # This represents a block
    block = Block(BLACK, 20, 15)

    # Set a random location for the block
    block.rect.x = random.randrange(screen_width)
    block.rect.y = random.randrange(screen_height)

    # Add the block to the list of objects
    block_list.add(block)
    all_sprites_list.add(block)

# Create a RED player block
player = Block(RED, 20, 15)
all_sprites_list.add(player)

# Loop until the user clicks the close button.
done = False

# Used to manage how fast the screen updates
clock = pygame.time.Clock()

score = 0

# -------- Main Program Loop -----------
while not done:
    for event in pygame.event.get(): 
        if event.type == pygame.QUIT: 
            done = True

    # Clear the screen
    screen.fill(WHITE)

    # Get the current mouse position. This returns the position
    # as a list of two numbers.
    pos = pygame.mouse.get_pos()

    # Fetch the x and y out of the list,
       # just like we'd fetch letters out of a string.
    # Set the player object to the mouse location
    player.rect.x = pos[0]
    player.rect.y = pos[1]

    # See if the player block has collided with anything.
    blocks_hit_list = pygame.sprite.spritecollide(player, block_list, True)

    # Check the list of collisions.
    for block in blocks_hit_list:
        score += 1
        print(score)

    # Draw all the spites
    for block in all_sprites_list:
        if block.rect.y + 1 > screen_height:
            block.rect.y = 0
        block.rect.y = block.rect.y + 1
    all_sprites_list.draw(screen)

    # Go ahead and update the screen with what we've drawn.
    pygame.display.flip()

    # Limit to 60 frames per second
    clock.tick(120)

pygame.quit()

好吧，我注意到当我移动鼠标时，其余的块移动得更慢（比如冻结了几分之一秒），但是当它在一个地方时，一切都在顺利移动。玩家精灵在所有精灵的列表中，并且没有计算玩家的位置 - 只获取鼠标的坐标。在我看来，一直获取 (100,100) 和获取其他鼠标坐标之间应该没有区别。

有人能解释一下为什么鼠标（玩家的精灵）的运动会影响其余的精灵吗？ 谢谢！

Answer 1

问题可能是您已经运行 Python 太长时间而没有重新启动，并且在之前的运行期间有相当多的数据有 accumulated in memory without being deallocated。如 cmets 所述，重启通常会解决它。