用Python中的限制改组列表 [英] shuffling a list with restrictions in Python
问题描述
我在使用Python(3)中的限制随机化列表时遇到问题.我还看到了与此有关的其他一些问题,但这些问题似乎都没有真正解决我的问题.我是一个初学者,因此非常感谢您的帮助!
I have a problem with randomizing a list with restrictions in Python (3). I have seen a few other questions relating to this, but none of them really seem to solve my problem. I'm a beginner, so any help is much appreciated!
我正在设计一种使用两种类型的刺激的实验:形状和颜色(每种四个).我需要生成所有16个组合的排列,这是通过random.shuffle-function完成的:
I'm designing an experiment using two types of stimuli: shapes and colors (four of each). I need to generate permutations of all 16 combinations, which I have done with random.shuffle-function:
import random
# letters are shapes, numbers are colors
x=["a1","a2","a3","a4","b1","b2","b3","b4","c1","c2","c3","c4","d1","d2","d3","d4"]
random.shuffle(x)
到目前为止,一切都很好.但是,我想避免形状(字母)或颜色(数字)在结果中连续出现两次(例如,"a2"后跟"a4",或"c2"后跟"a2").
So far so good. However, I want to avoid a shape (letter) or color (number) to appear two times in succession in my result (e.g. "a2" followed by "a4", or "c2" followed by "a2").
有没有办法做这样的限制?
预先感谢!
Is there a way to make such a restriction?
Thanks in advance!
推荐答案
这样的事情应该在合理的时间内给出合理的答案
Something like this should give a reasonable answer in a reasonable time
import random
while 1:
choices = ["a1", "a2","a3","b1","b2","b3","c1","c2","c3"]
shuffle = []
last = ""
while choices:
l = choices
if last:
l = [x for x in l if x[0] != last[0] and x[1] != last[1]]
if not l:
#no valid solution
break
newEl = random.choice(l)
last = newEl
shuffle.append(newEl)
choices.remove(newEl)
if not choices:
print(shuffle)
break
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