This project implements Python based Engine.IO client and server that can run standalone or integrated with a variety of Python web frameworks and applications. Engine.IO is a lightweight transport protocol that enables real-time bidirectional event-based communication between clients (typically, though not always, web browsers) and a server. The official implementations of the client and server components are written in JavaScript. This package provides Python implementations of both, each with standard and asyncio variants. The Engine.IO protocol is extremely simple. Once a connection between a client and a server is established, either side can send "messages" to the other side. Event handlers provided by the applications on both ends are invoked when a message is received, or when a connection is established or dropped.