为什么蟒蛇随机生成相同的结果？

Question

我用Python写了一个相当简单的程序。代码如下：

import pygame

import time

from math import *

from random import *

from pygame.locals import *

def mutateBrain(brain):

    a = 0

    for element in brain:

        brain[a][0] = element[0] + (1 * (0.5 - random()))

        brain[a][1] = element[1] + (1 * (0.5 - random()))

        a = a + 1

    return brain;

def generateFirstBrain():

    genbrain = []

    h = 0;

    while randint(0,5) != 0:

        asd = [2 * random(), 2 * random()]

        genbrain.insert(h, asd)

        h = h + 1

    return genbrain

pygame.init()

width, height = 640, 480

screen=pygame.display.set_mode((width, height))

screen.fill(pygame.Color(255,255,255))

pygame.draw.rect(screen,(255,0,0),(310,0,30,30))

movesa = generateFirstBrain()

movesb = generateFirstBrain()

movesc = generateFirstBrain()

cola = (255,255,0)

colb = (255,0,255)

colc = (0,255,255)

while 1:

    movesa = mutateBrain(movesa)

    movesb = mutateBrain(movesb)

    movesc = mutateBrain(movesc)

    step = 0

    acurrentx = 320

    acurrenty = 240

    bcurrentx = 320

    bcurrenty = 240

    ccurrentx = 320

    ccurrenty = 240

    totalsn = 0

    if (len(movesa) >= len(movesb)) and (len(movesa) >= len(movesc)):

        totalsn = len(movesa)

    elif (len(movesb) >= len(movesa)) and (len(movesb) >= len(movesc)):

        totalsn = len(movesb)

    else:

        totalsn = len(movesc)

    for g in range(totalsn):

        screen.fill(pygame.Color(255,255,255))

        pygame.draw.rect(screen,(255,0,0),(305,0,30,30))

        try:

            acurrentx = acurrentx + 1 - movesa[step][0]

            acurrenty = acurrenty + 1 - movesa[step][1]

        except IndexError:

            acurrentx = acurrentx

在这里，在第一个 while 循环结束时，无论我运行突变大脑函数多少次，movel 总是得到相同的值。但它会发生变化，因此随机应该存在问题。有人可以帮我这个吗？谢谢。

Answer 1

使用这个工作：突变大脑 = λ x： [[y + 0.5 - 随机 （） 对于 y 在 a 中] 对于 x 中的 a]