Expert Twisted starts with an introduction to event-driven programming, explaining it in the context of what makes Twisted unique. It shows how Twisted's design emphasizes testability as a solution to common challenges of reliability, debugging, and start-to-finish causality that are inherent in event-driven programming. It also explains asynchronous programming, and the importance of functions, deferreds, and coroutines. It then uses two popular applications, treq and klein, to demonstrate calling and writing Web APIs with Twisted.

The second part of the book dives into Twisted projects, in each case explaining how the project fits into the Twisted ecosystem and what it does, and offers several examples to bring readers up to speed, with pointers to additional resources for more depth. Examples include using Twisted with Docker, as a WSGI container, for file sharing, and more.

• Integrate Twisted and asyncio using adapters
  
• Automate software build, test, and release processes with Buildbot
  
• Create clients and servers with Autobahn
  
• Transfer files with Magic Wormhole
  
• Distribute cloud-based file storage with Tahoe LAFS
• Understand HTTP/2 with Python and Twisted
  
• Support for asynchronous tasks using Django Channels
  

Readers should have some Python experience and understand the essentials of containers and protocols, but need not be familiar with Twisted or the associated projects covered in the book.