用python和物理计算Pi数字

Question

我正在关注来自youtube的这个用java编写的编码挑战。我想用python重新创建它。链接：https://www.youtube.com/watch?v=PoW8g67XNxA&t=586s 问题是我什么时候想把两个家伙都弹出来。由于它们在同一时间弹跳（它们在同一时刻改变速度），b1.s的变量（关于速度）改变了，当我试图用它来改变另一个速度（b2.speed）时，它已经被修改了。很难解释！请看一下我的代码

在Java中，它们使用常量变量。我不能在python中使用它们

import pygame, sys, math, time
import constant

pygame.init()
collitions = 0

pygame.mixer.music.load("C:\\Users\\Martín\\Desktop\\PYTHON\\abc.mp3")
clock = pygame.time.Clock()
screen = pygame.display.set_mode([800, 600])


class block:
    def __init__(self, x, v, m, w):
        self.x = x
        self.y = 300 - w
        self.w = w
        self.v = v
        self.m = m
    def update(self):
        self.x -= self.v
    def col_1(self):
        if self.x <= 50:
            global collitions
            collitions += 1
            self.v = -(self.v)
            return True
    def col_2(self, other):
        if self.x + self.w > other.x:
            return True
    def bounceb1(self, other):
        sumM = self.m + other.m
        newV = ((self.m - other.m) / sumM) * other.v 
        newV += ((2 * other.m) / sumM) * other.v
        return newV

b1 = block(300, 0, 50, 50)
b2 = block(500, 3, 50, 100)

def draw():
    b1.update()
    b2.update()
    b1.col_1()
    if b1.col_2(b2):
        b1.v = b1.bounceb1(b2)
        b2.v = 
    text_1 = "Colisiones: " + str(collitions)
    font = pygame.font.SysFont("ocraextended", 35)
    label = font.render(text_1, 1, (0, 0, 0))
    screen.blit(label, (400, 400))
    pygame.draw.rect(screen, (255, 0, 0), (b1.x, b1.y, b1.w, b1.w))
    pygame.draw.rect(screen, (255, 0, 0), (b2.x, b2.y, b2.w, b2.w))
    pygame.draw.line(screen, (0, 0, 0), (0, 300), (800, 300))
    pygame.draw.line(screen, (0, 0, 0), (50, 0), (50, 600))


def main():
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
        screen.fill((255, 255, 255))
        draw()
        pygame.display.update()
        clock.tick(60)

main()