在 Python 中随机化所有可能的组合答案

【问题标题】：Randomizing in all possible combinations in Python在 Python 中随机化所有可能的组合
【发布时间】：2015-03-04 19:52:31
【问题描述】：

这是我的代码：

if condition == '1':
    a = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist1/*")
    c = glob.glob("DDtest/targetimagelist2/*")
    d = glob.glob("DDtest/distractorimagelist3/*")
    e = glob.glob("DDtest/targetimagelist4/*")
elif condition == '2':
    a = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist1/*")
    c = glob.glob("DDtest/targetimagelist2/*")
    e = glob.glob("DDtest/distractorimagelist3/*")
    d = glob.glob("DDtest/targetimagelist4/*")
elif condition == '3':
    a = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist1/*")
    e = glob.glob("DDtest/targetimagelist2/*")
    d = glob.glob("DDtest/distractorimagelist3/*")
    c = glob.glob("DDtest/targetimagelist4/*")
elif condition == '4':
    a = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist1/*")
    e = glob.glob("DDtest/targetimagelist2/*")
    c = glob.glob("DDtest/distractorimagelist3/*")
    d = glob.glob("DDtest/targetimagelist4/*")
elif condition == '5':
    a = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist1/*")
    d = glob.glob("DDtest/targetimagelist2/*")
    c = glob.glob("DDtest/distractorimagelist3/*")
    e = glob.glob("DDtest/targetimagelist4/*")
elif condition == '6':
    a = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist1/*")
    d = glob.glob("DDtest/targetimagelist2/*")
    e = glob.glob("DDtest/distractorimagelist3/*")
    c = glob.glob("DDtest/targetimagelist4/*")
elif condition == '7':
    d = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist2/*")
    a = glob.glob("DDtest/targetimagelist2/*")
    c = glob.glob("DDtest/distractorimagelist3/*")
    e = glob.glob("DDtest/targetimagelist4/*")
elif condition == '8':
    d = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist2/*")
    a = glob.glob("DDtest/targetimagelist2/*")
    e = glob.glob("DDtest/distractorimagelist3/*")
    c = glob.glob("DDtest/targetimagelist4/*")
elif condition == '9':
    d = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist3/*")
    e = glob.glob("DDtest/targetimagelist2/*")
    a = glob.glob("DDtest/distractorimagelist3/*")
    c = glob.glob("DDtest/targetimagelist4/*")
elif condition == '10':
    d = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist4/*")
    e = glob.glob("DDtest/targetimagelist2/*")
    c = glob.glob("DDtest/distractorimagelist3/*")
    a = glob.glob("DDtest/targetimagelist4/*")
elif condition == '11':
    d = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist4/*")
    c = glob.glob("DDtest/targetimagelist2/*")
    e = glob.glob("DDtest/distractorimagelist3/*")
    a = glob.glob("DDtest/targetimagelist4/*")
elif condition == '12':
    d = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist3/*")
    c = glob.glob("DDtest/targetimagelist2/*")
    a = glob.glob("DDtest/distractorimagelist3/*")
    e = glob.glob("DDtest/targetimagelist4/*")
elif condition == '13':
    c = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist2/*")
    a = glob.glob("DDtest/targetimagelist2/*")
    d = glob.glob("DDtest/distractorimagelist3/*")
    e = glob.glob("DDtest/targetimagelist4/*")
elif condition == '14':
    c = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist2/*")
    a = glob.glob("DDtest/targetimagelist2/*")
    e = glob.glob("DDtest/distractorimagelist3/*")
    d = glob.glob("DDtest/targetimagelist4/*")
elif condition == '15':
    c = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist3/*")
    e = glob.glob("DDtest/targetimagelist2/*")
    a = glob.glob("DDtest/distractorimagelist3/*")
    d = glob.glob("DDtest/targetimagelist4/*")
elif condition == '16':
    c = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist4/*")
    e = glob.glob("DDtest/targetimagelist2/*")
    d = glob.glob("DDtest/distractorimagelist3/*")
    a = glob.glob("DDtest/targetimagelist4/*")
elif condition == '17':
    c = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist4/*")
    d = glob.glob("DDtest/targetimagelist2/*")
    e = glob.glob("DDtest/distractorimagelist3/*")
    a = glob.glob("DDtest/targetimagelist4/*")
elif condition == '18':
    c = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist3/*")
    d = glob.glob("DDtest/targetimagelist2/*")
    a = glob.glob("DDtest/distractorimagelist3/*")
    e = glob.glob("DDtest/targetimagelist4/*")
elif condition == '19':
    e = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist2/*")
    a = glob.glob("DDtest/targetimagelist2/*")
    c = glob.glob("DDtest/distractorimagelist3/*")
    d = glob.glob("DDtest/targetimagelist4/*")
elif condition == '20':
    e = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist2/*")
    a = glob.glob("DDtest/targetimagelist2/*")
    d = glob.glob("DDtest/distractorimagelist3/*")
    c = glob.glob("DDtest/targetimagelist4/*")
elif condition == '21':
    e = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist3/*")
    c = glob.glob("DDtest/targetimagelist2/*")
    a = glob.glob("DDtest/distractorimagelist3/*")
    d = glob.glob("DDtest/targetimagelist4/*")
elif condition == '22':
    e = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist4/*")
    c = glob.glob("DDtest/targetimagelist2/*")
    d = glob.glob("DDtest/distractorimagelist3/*")
    a = glob.glob("DDtest/targetimagelist4/*")
elif condition == '23':
    e = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist4/*")
    d = glob.glob("DDtest/targetimagelist2/*")
    c = glob.glob("DDtest/distractorimagelist3/*")
    a = glob.glob("DDtest/targetimagelist4/*")
elif condition == '24':
    e = glob.glob("DDtest/targetimagelist1/*")
    b = glob.glob("DDtest/distractorimagelist3/*")
    d = glob.glob("DDtest/targetimagelist2/*")
    a = glob.glob("DDtest/distractorimagelist3/*")
    c = glob.glob("DDtest/targetimagelist4/*")

基本上，它的作用是从基于 a、c、d、e 的所有组合的不同列表中提取，并使 a 和 b 对应。这段代码工作正常，但不是很漂亮。我想知道是否有人对我用更少的代码行做同样的事情有任何建议。最重要的是，我只是想扩展我编写代码的知识，所以如果你知道有一种更雄辩的方式来写这个，请告诉我。 :)

【问题讨论】：

这可能更适合codereview.stackexchange.com
嗯...根据我的计数，应该有 5 个项目的 120 个排列（一次取 5 个）...您似乎只有 24 个。我在这里遗漏了什么吗？
我很想在这方面提供帮助，但模式太不清楚了。您正在交换变量及其数据的顺序。更好地组织数据，更容易看到模式。
在某些情况下，a 和 b 的值相同，而不仅仅是相关（例如 9、12 和 15）-为什么？
听说过列表吗？

标签： python list random psychopy

【解决方案1】：

不确定您所说的“使 a 和 b 对应”是什么意思，但也许这会起作用：

from itertools import permutations
from random import choice

globs = [glob.glob("DDtest/targetimagelist1/*"),
         glob.glob("DDtest/distractorimagelist1/*"),
         glob.glob("DDtest/targetimagelist2/*"),
         glob.glob("DDtest/distractorimagelist3/*"),
         glob.glob("DDtest/targetimagelist4/*")]

glob_permutations = list(permutations(globs))

a, b, c, d, e = choice(glob_permutations)

【讨论】：

【解决方案2】：

内置的itertools库有一个函数permutations不重复：

#!/usr/bin/env python2
import itertools
import glob

p = [
    glob.glob("DDtest/targetimagelist1/*"),
    glob.glob("DDtest/distractorimagelist4/*"),
    glob.glob("DDtest/targetimagelist2/*"),
    glob.glob("DDtest/distractorimagelist3/*"),
    glob.glob("DDtest/targetimagelist4/*"),
]

perm = itertools.permutations(p)

print(len(perm))

=> 120 个排列

【讨论】：

【解决方案3】：

也许是这样？

setup = {'1': ('1','1','2','3','4'),
         '2': ('1','1','2','3','4'),
        #...
        }
a = glob.glob("DDtest/targetimagelist" + setup[condition][0] + "/*")
b = glob.glob("DDtest/distractorimagelist" + setup[condition][1] + "/*")
c = glob.glob("DDtest/targetimagelist" + setup[condition][2] + "/*")
d = glob.glob("DDtest/distractorimagelist" + setup[condition][3] + "/*")
e = glob.glob("DDtest/targetimagelist" + setup[condition][4] + "/*")

【讨论】：

好像你只是将问题从一个地方转移到另一个地方。
是吗？它使代码更短，而且我看不出您如何避免将其全部列出。要么，要么我没有看到条件和组合之间的联系。
是的，我认为存在我们没有看到的联系，因为问题并不完全清楚。