如何从以下列表中随机检索项目?

foo = ['a', 'b', 'c', 'd', 'e']

当前回答

foo = ['a', 'b', 'c', 'd', 'e']
number_of_samples = 1

在Python 2中:

random_items = random.sample(population=foo, k=number_of_samples)

在Python 3中:

random_items = random.choices(population=foo, k=number_of_samples)

其他回答

随机项目选择:

import random

my_list = [1, 2, 3, 4, 5]
num_selections = 2

new_list = random.sample(my_list, num_selections)

要保持列表的顺序,可以执行以下操作:

randIndex = random.sample(range(len(my_list)), n_selections)
randIndex.sort()
new_list = [my_list[i] for i in randIndex]

的副本https://stackoverflow.com/a/49682832/4383027

如果还需要索引,请使用random.randrange

from random import randrange
random_index = randrange(len(foo))
print(foo[random_index])
foo = ['a', 'b', 'c', 'd', 'e']
number_of_samples = 1

在Python 2中:

random_items = random.sample(population=foo, k=number_of_samples)

在Python 3中:

random_items = random.choices(population=foo, k=number_of_samples)

如果需要索引,只需使用:

import random
foo = ['a', 'b', 'c', 'd', 'e']
print int(random.random() * len(foo))
print foo[int(random.random() * len(foo))]

random.choice也会这样做:)

使用random.choice():

import random

foo = ['a', 'b', 'c', 'd', 'e']
print(random.choice(foo))

对于加密安全的随机选择(例如,从单词列表生成密码),请使用secrets.choice():

import secrets

foo = ['battery', 'correct', 'horse', 'staple']
print(secrets.choice(foo))

Python 3.6中的新秘密。在旧版本的Python上,可以使用random.SystemRandom类:

import random

secure_random = random.SystemRandom()
print(secure_random.choice(foo))