python - 如何从迭代器中随机选取一个元素？

Question

如何从迭代器中随机选取一个元素？

random.choice(generaotr) 会提示 TypeError: object of type 'generator' has no len()

Answer 1

Signature: random.choice(seq), the parameter should be a sequence, first convert the generator to a sequence.

<code>random.choice(list(generator))</code>

Answer 2

You can cache a certain number of iterator values ​​first and then grab them randomly.

<code>sets = list(zip(range(100),generator()))
choice = random.choice(sets)[1]</code>

Or directly randomize an integer, and then next() all the way to that position.

Answer 3

The question should be thought of like this: Since iterators are used, why do we need to randomly select numbers? What if the iterator is infinite? Of course, it can be converted into a list and will be discussed later