Question

我有一个具有特定范围的列表列表：

l = [["this", "is", "a"], ["list", "of"], ["lists", "that", "i", "want"], ["to", "copy"]]

一个单词列表：

words = ["lorem", "ipsum", "dolor", "sit", "amet", "id", "sint", "risus", "per", "ut", "enim", "velit", "nunc", "ultricies"]

我需要创建列表列表的精确副本，但是从其他列表中选择随机词。

这是我想到的第一件事，但没有骰子。

for random.choice in words:
  for x in list:
    for y in x:
      y = random.choice

有什么想法吗？提前谢谢！

Answer 1

您可以使用列表推导：

import random
my_list = [[1, 2, 3], [5, 6]]
words = ['hello', 'Python']

new_list = [[random.choice(words) for y in x] for x in my_list]
print(new_list)

输出：

[['Python', 'Python', 'hello'], ['Python', 'hello']]

这相当于：

new_list = []
for x in my_list:
    subl = []
    for y in x:
        subl.append(random.choice(words))
    new_list.append(subl)

使用您的示例数据：

my_list = [['this', 'is', 'a'], ['list', 'of'], 
           ['lists', 'that', 'i', 'want'], ['to', 'copy']]

words = ['lorem', 'ipsum', 'dolor', 'sit', 'amet', 'id', 'sint', 'risus',
         'per', 'ut', 'enim', 'velit', 'nunc', 'ultricies']
new_list = [[random.choice(words) for y in x] for x in my_list]
print(new_list)

输出：

[['enim', 'risus', 'sint'], ['dolor', 'lorem'], ['sint', 'nunc', 'ut', 'lorem'], ['ipsum', 'amet']]

Answer 2

您未将值存储回列表中。尝试：

import multiprocessing as mp
    query_points = query_points.tolist()
    parallel = mp.Pool()
    fv = parallel.map(par_gmm, query_points)
    parallel.close()
    parallel.join()

Answer 3

您应该展平列表列表，然后随机播放，然后重建。例如：

import random

def super_shuffle(lol):
  sublist_lengths = [len(sublist) for sublist in lol]
  flat = [item for sublist in lol for item in sublist]
  random.shuffle(flat)
  pos = 0
  shuffled_lol = []
  for length in sublist_lengths:
    shuffled_lol.append(flat[pos:pos+length])
    pos += length
  return shuffled_lol

print super_shuffle([[1,2,3,4],[5,6,7],[8,9]])

打印：

[[7, 8, 5, 6], [9, 1, 3], [2, 4]]

这会在所有列表中随机化，而不仅仅在单个子列表中，并保证不会重复。

使用随机项填充列表列表

3 个答案: