Trio is an asynchronous I/O runtime and concurrency library for Python. It provides a system for executing non-blocking network and disk operations through a centralized event loop and task scheduler.
The library is built on a structured concurrency model, which ensures that asynchronous tasks are bound to a specific lifetime and cannot outlive the scope that started them. It utilizes a nursery-based task manager to track task lifecycles in a parent-child tree, preventing orphaned concurrent operations by requiring child tasks to be joined before their parent scope exits.
The framework covers asynchronous I/O programming and high concurrency networking, allowing for the management of multiple parallel operations and network connections. It also includes capabilities for concurrent task coordination and async resource management to ensure clean shutdowns of tasks and system resources.