Optimize random.choice when there is just one item about cpython

[iritkatriel]

Adding the check will slow down the case where len > 1, which is the most common case.

[Zheaoli]

I would like to PR for this

[Alex-Izquierdo]

I would like to PR for this

Hi @Zheaoli I have the plan to create a PR, just I wanted to make sure if the people agree with it. It seemed to me a very obvious thing and maybe there is a reason to not do it that I'm missing.

[Alex-Izquierdo]

Adding the check will slow down the case where len > 1, which is the most common case.

That seems a very fair point. I think it is better to let the implementation decide how often it is the case and if it is worth it.