How to implement an efficient infinite generator of prime numbers in Python?

This is not a homework, I am just curious.

INFINITE is the key word here.

I wish to use it as for p in primes(). I believe that this is a built-in function in Haskell.

So, the answer cannot be as naive as "Just do a Sieve".

First of all, you do not know how many consecutive primes will be consumed. Well, suppose you could concoct 100 of them at a time. Would you use the same Sieve approach as well as the frequency of prime numbers formula?

I prefer non-concurrent approach.

Thank you for reading (and writing ;) )!