问题描述
我用Google搜索了很多,但是找不到.我想知道random.sample()
方法的用途,它有什么作用?什么时候应该使用它以及一些示例用法.
I Googled it a lot but could not found it. I want to know the use of random.sample()
method and what does it give? When should it be used and some example usage.
推荐答案
根据文档:
返回长度为k的唯一元素列表 从总体序列中选择.用于随机抽样而无需 替换.
Return a k length list of unique elements chosen from the population sequence. Used for random sampling without replacement.
基本上,它从序列中选取k个唯一的随机元素(样本):
Basically, it picks k unique random elements, a sample, from a sequence:
>>> import random
>>> c = list(range(0, 15))
>>> c
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
>>> random.sample(c, 5)
[9, 2, 3, 14, 11]
random.sample
也可以直接在范围内工作:
random.sample
works also directly from a range:
>>> c = range(0, 15)
>>> c
range(0, 15)
>>> random.sample(c, 5)
[12, 3, 6, 14, 10]
除序列外,random.sample
也可用于集合:
In addition to sequences, random.sample
works with sets too:
>>> c = {1, 2, 4}
>>> random.sample(c, 2)
[4, 1]
但是,random.sample
不适用于任意迭代器:
However, random.sample
doesn't work with arbitrary iterators:
>>> c = [1, 3]
>>> random.sample(iter(c), 5)
TypeError: Population must be a sequence or set. For dicts, use list(d).
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