Best Web Servers for Python

Tornado is a web framework for Python that also serves as an asynchronous networking library, initially created at FriendFeed. Utilizing non-blocking network I/O, it has the capability to manage tens of thousands of simultaneous connections, making it particularly suited for applications requiring long-lived user connections, such as long polling and WebSockets. Unlike most Python web frameworks, Tornado does not follow the WSGI standard and is primarily operated with a single thread per process. Although the tornado.wsgi module offers some WSGI compatibility, it is not the main focus of development, and developers are encouraged to utilize Tornado’s own interfaces, like tornado.web, for building applications. It is important to note that Tornado code is generally not designed to be thread-safe. Since version 5.0, Tornado has been integrated with Python's standard library asyncio module, sharing the same default event loop. This integration allows for seamless mixing of libraries that are built for asyncio with Tornado, enhancing its versatility and functionality. As a result, developers can create highly efficient applications that leverage both Tornado's strengths and asyncio's capabilities.

Facilitates the functionality of both the client and server sides of the HTTP protocol, seamlessly integrates client and server web-sockets without additional setup, and effectively prevents callback hell by utilizing middlewares and customizable routing options. This approach enhances the development experience by providing a more streamlined and efficient workflow.

Gunicorn, also known as 'Green Unicorn,' functions as a Python WSGI HTTP Server tailored for UNIX systems. Utilizing a pre-fork worker model, it efficiently manages multiple requests. This server is highly adaptable, supporting a wide range of web frameworks, and is designed to be easy to implement, resource-efficient, and relatively fast, making it a preferred choice for many developers. Its performance and compatibility make it an excellent option for deploying web applications.