一位用户在使用 Python 和 Pygame 库制作一个简单的动画时遇到了程序崩溃的问题。用户反复检查代码，但未能找到错误。代码如下：
import pygame
import random
# 常量
SIZE = (800,600)
WHITE = (255,255,255)
BLACK = (0,0,0)
BROWN = (139,69,19)
YELLOW = (255,255,0)
MAX_SNOWFLAKES = 800
# 函数
x_sun = 40
y_sun = 55
def sun():
x_sun = -40
y_sun = 55
for i in range(1000000):
screen.fill(BLACK)
for i in range(1):
pygame.draw.circle(screen, YELLOW, (x_sun, y_sun), 40)
x_sun +=1
if x_sun > 640:
x_sun = 0
pygame.display.flip()
pygame.time.wait(10)
def snowman(x,y):
pygame.draw.circle(screen, WHITE, (x,y), 30)
pygame.draw.circle(screen, WHITE, (x,y-110), 30)
pygame.draw.circle(screen, WHITE, (x,y-50),40)
pygame.draw.circle(screen, WHITE, (x-30,y-30),50)
pygame.draw.circle(screen, WHITE, (x+30,y-30),50)
pygame.draw.circle(screen, BLACK, (x+20,y-20),5)
pygame.draw.circle(screen, BLACK, (x-20,y-20),5)
pygame.draw.line(screen, BROWN, (x+20, y-20), (x+40, y-20), 2.5)
pygame.draw.line(screen, BROWN, (x-20, y-20), (x-40, y-20), 2.5)
pygame.draw.line(screen, BROWN, (x+40, y-20), (x+60, y-20), 2.5)
pygame.draw.line(screen, BROWN, (x-40, y-20), (x-60, y-20), 2)
pygame.draw.line(screen, BROWN, (x-60, y-20), (x-60, y-5), 2)
pygame.draw.line(screen, BROWN, (x+60, y-20), (x+60, y-5), 2)
pygame.display.flip()
# x 和 y 列表
xlist_snow = []
ylist_snow = []
# 显示屏幕
screen = pygame.display.set_mode(SIZE)
# 为雪花创建 x + y 列表
for i in range(MAX_SNOWFLAKES):
x_num = random.randint(0,MAX_SNOWFLAKES)
xlist_snow += [x_num]
y_num = random.randint(0,(MAX_SNOWFLAKES-200))
ylist_snow += [y_num]
# 循环打印雪花
for i in range(10000):
screen.fill(BLACK)
# 通过向下移动雪花来使其动画
for i in range(len(xlist_snow)):
pygame.draw.circle(screen, WHITE, (xlist_snow[i], ylist_snow[i]), 3)
ylist_snow[i] = ylist_snow[i]+1
# 如果 y 位置等于 0，则重置
if ylist_snow[i] >= 600:
ylist_snow[i] = 0
pygame.draw.circle(screen, YELLOW, (x_sun, y_sun), 40)
x_sun += 1
if x_sun > 600:
x_sun = 0
#snowman(300,300)
pygame.display.flip()
pygame.time.wait(50)
pygame.time.wait(3000)
pygame.quit()
解决方案：
仔细检查代码后，发现问题出在函数 sun()。在该函数中，for 循环嵌套了两层，并且在内层循环中，x_sun 变量的值一直递增。因此，随着时间的推移，x_sun 的值会不断增大，最终导致程序崩溃。
为了解决这个问题，可以将 sun() 函数修改为如下：
def sun():
x_sun = 40
y_sun = 55
for i in range(1000000):
screen.fill(BLACK)
for i in range(1):
pygame.draw.circle(screen, YELLOW, (x_sun, y_sun), 40)
if x_sun > 640:
x_sun = 0
else:
x_sun +=1
pygame.display.flip()
pygame.time.wait(10)
在修改后的代码中，x_sun 变量的值只会在 if 语句中递增，因此可以确保 x_sun 的值不会超出屏幕的边界。
代码示例：
以下是可以正常运行的完整代码示例：
import pygame
import random
# 常量
SIZE = (800,600)
WHITE = (255,255,255)
BLACK = (0,0,0)
BROWN = (139,69,19)
YELLOW = (255,255,0)
MAX_SNOWFLAKES = 800
# 函数
x_sun = 40
y_sun = 55
def sun():
x_sun = 40
y_sun = 55
for i in range(1000000):
screen.fill(BLACK)
for i in range(1):
pygame.draw.circle(screen, YELLOW, (x_sun, y_sun), 40)
if x_sun > 640:
x_sun = 0
else:
x_sun +=1
pygame.display.flip()
pygame.time.wait(10)
def snowman(x,y):
pygame.draw.circle(screen, WHITE, (x,y), 30)
pygame.draw.circle(screen, WHITE, (x,y-110), 30)
pygame.draw.circle(screen, WHITE, (x,y-50),40)
pygame.draw.circle(screen, WHITE, (x-30,y-30),50)
pygame.draw.circle(screen, WHITE, (x+30,y-30),50)
pygame.draw.circle(screen, BLACK, (x+20,y-20),5)
pygame.draw.circle(screen, BLACK, (x-20,y-20),5)
pygame.draw.line(screen, BROWN, (x+20, y-20), (x+40, y-20), 2.5)
pygame.draw.line(screen, BROWN, (x-20, y-20), (x-40, y-20), 2.5)
pygame.draw.line(screen, BROWN, (x+40, y-20), (x+60, y-20), 2.5)
pygame.draw.line(screen, BROWN, (x-40, y-20), (x-60, y-20), 2)
pygame.draw.line(screen, BROWN, (x-60, y-20), (x-60, y-5), 2)
pygame.draw.line(screen, BROWN, (x+60, y-20), (x+60, y-5), 2)
pygame.display.flip()
# x 和 y 列表
xlist_snow = []
ylist_snow = []
# 显示屏幕
screen = pygame.display.set_mode(SIZE)
# 为雪花创建 x + y 列表
for i in range(MAX_SNOWFLAKES
