Python 3.4+ provides excellent Asyncio library for asynchronous tasks scheduling and asynchronous I/O operations.   It’s similar to gevent, but here tasks are implemented by generator based coroutines.  Asynchronous I/O is useful for higher I/O loads, where it usually achieves better performance and scalability then other approaches (threads, processes). About a year ago I played with OCaml, where light weight threads/ coroutines and asynchronous I/O  approaches  are also very popular (Ocaml has same limitation for threading as Python – a global lock) and there were two great libraries – lwt and core async.  Both libraries use monads as a programming style to work with asynchronous tasks. In this article we will try to implement something similar on basis of asyncio library. While our solution will  probably not provide “pure” monads it’ll still be fun and we’ll learn something about asyncio. Continue reading Functional Fun with Asyncio and Monads →