I second more_itertools. It has many useful functions such as chunked()/ichunked(), spy(), one(), only(), unique_everseen(), and unique_justseen(). Python 3.12

I second more_itertools. It has many useful functions such as chunked()/ichunked(), spy(), one(), only(), unique_everseen(), and unique_justseen(). Python 3.12 is only now getting an equivalent to chunked() as itertools.batched().