同学的，抄来的（先保存，回去看思路，避免以后忘记了不知道怎么做）

原作者:KingJX

Import pygame
import random
from math import sqrt
from random import randint

def ball_color():
return randint(0,255),randint(0,255),randint(0,255)

all_balls = []
radius = 'radius'
center = 'pos'
color = 'color'
x_speed = 'x_speed'
y_speed = 'y_speed'

if name == 'main':
pygame.init()
screen = pygame.display.set_mode((800,600))
screen.fill((255,255,255))
pygame.display.flip()

while True:
    pygame.time.delay(5)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            exit()
        if event.type == pygame.MOUSEBUTTONDOWN:

            ball = {radius:randint(10,25), center:event.pos, color: ball_color(),x_speed:randint(-2,2),y_speed:randint(-2,2)}
            all_balls.append(ball)

    screen.fill((255,255,255))
    for ball_dict in all_balls:

        x, y = ball_dict[center]
        x_speed1 = ball_dict[x_speed]
        y_speed1 = ball_dict[y_speed]
        x += x_speed1
        y += y_speed1
        if x + ball_dict[radius] >= 800:
            x = 800 - ball_dict[radius]
            x_speed1 *= -1
        if x - ball_dict[radius]  <= 0:
            x = ball_dict[radius]
            x_speed1 *= -1
        if y + ball_dict[radius]  >= 600:
            y = 600 - ball_dict[radius]
            y_speed1 *= -1
        if y - ball_dict[radius]  <= 0:
            y = ball_dict[radius]
            y_speed1 *= -1
        a = all_balls[:]
        for index1 in all_balls:
            for index2 in all_balls:
                if index1 == index2:
                    continue
                else:
                    x1,y1 = index1[center]
                    x2,y2 = index2[center]
                    if sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)) < index1[radius]+index2[radius]:
                        if index1[radius] < index2[radius]:
                            index2[radius] += index1[radius]
                            all_balls.remove(index1)
                        else:
                            index1[radius] += index2[radius]
                            all_balls.remove(index2)




        pygame.draw.circle(screen, ball_dict[color], (x, y), ball_dict[radius])
        ball_dict[center] = x, y
        ball_dict[x_speed] = x_speed1
        ball_dict[y_speed] = y_speed1
    pygame.display.update()