stream – Lazily-evaluated, parallelizable pipeline - interesting small library for Python where streams are used as lazy evaluation lists for better parallelizability of code. And since Python is somewhat limited by the GIL when it comes to threads, models for using multiprocessing are also offered here (independent processes allow multiple cores to be used efficiently in Python, but at the cost of communication overhead between the processes). Certainly to be used with caution for various reasons - massive parallelism should rather be avoided with it, because since system threads and system processes are used, there is no way to have thousands of parallel processes (as would be possible with microthreads, for example). But still certainly useful for some problems.