如何从给定范围内统一得到n个唯一的数字？

Question

我有一个整数范围 [0, Z)。我需要获得 n （其中 n <= Z) random numbers from this range, but they have to be unique. So I know I can just code up rejection sampling to do this, but I'm wondering if there's a one line python function that can do this for me?

Answer 1

为什么不使用无放回随机抽样

import numpy as np

n = 25
a = range(26)
out = np.random.choice(a, size=n, replace=False)

len(np.unique(out))
>>>25