从与另一个列表没有共同元素的总体生成随机样本列表

Question

我希望从一个列表中对元素进行采样，这样就不会有任何元素包含在另一个指定元素列表中。我希望继续生成新样本，直到生成一个不相交的样本。下面的代码就是我所想到的，但是当有一个相交的初始样本时，它就不起作用了，它进入一个无限循环，打印显示所有生成的样本都是相同的

import random 
unique_entities=['100','1001','10001','100001','11111']
pde_fin= ['2151', '2146', '2153', '2135', '2158', '2160', '2137', '2169', '2147', '2015', '2022', '2173', '2028', '2014', '2018', '2009', '1140', '1085', '1136', '1132', '1007', '1080', '1078', '1131', '1106', '1164', '1092', '1108', '1118', '1045', '1051', '1006','1001']
random_entities=random.sample(unique_entities,3) #choses 5 unique entities 
while(not(set(random_entities).isdisjoint(pde_fin))):
       random_entites=random.sample(unique_entities,5)
       print(random_entities,"random_entites")

print(unique_entities)

你能帮我了解出了什么问题吗

Answer 1

行random_entites=random.sample(unique_entities,5)有两个问题：

• 首先，有一个打字错误，你写了random_entites而不是random_entities
• 其次，您从unique_entities中获取了5个元素的样本，这恰好总共只包含5个元素。因此，示例始终包含元素'1001'，该元素也位于pde_fin中

---

以下是该程序的工作版本，其中包括一些其他调整：

import random

unique_entities = ['100', '1001', '10001', '100001', '11111']
pde_fin = ['2151', '2146', '2153', '2135', '2158', '2160', '2137', '2169', '2147', '2015', '2022', '2173', '2028',
           '2014', '2018', '2009', '1140', '1085', '1136', '1132', '1007', '1080', '1078', '1131', '1106', '1164',
           '1092', '1108', '1118', '1045', '1051', '1006', '1001']

sample_size = 3

random_entities = set(random.sample(unique_entities, sample_size))
print(f"{random_entities=}")
while not random_entities.isdisjoint(pde_fin):
    random_entities = set(random.sample(unique_entities, sample_size))
    print(f"{random_entities=}")

print(f"Result: {random_entities}")

Answer 2

在进行采样之前，可以过滤唯一的_实体。从数学上讲，之前或之后的过滤在随机性方面是相同的

unique_entities=['100','1001','10001','100001','11111']
pde_fin= ['2151', '2146', '2153', '2135', '2158', '2160', '2137', '2169', '2147', '2015', '2022', '2173', '2028', '2014', '2018', '2009', '1140', '1085', '1136', '1132', '1007', '1080', '1078', '1131', '1106', '1164', '1092', '1108', '1118', '1045', '1051', '1006','1001']
unique_entities_unique = [i for i in unique_entities if not i in pde_fin]
random_entities=random.sample(unique_entities_unique,3)
print(random_entities,"random_entites")