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Who is Twisted?

Twisted is an open-source event-driven networking engine for Python used to build asynchronous networked applications and services.

  • Asynchronous event-driven networking framework for Python applications.
  • Support for multiple application protocols, including Hypertext Transfer Protocol (HTTP), Simple Mail Transfer Protocol (SMTP), IMAP, Secure Shell (SSH), and others (networking middleware).
  • Extensible architecture with pluggable event loops, transports, and protocol implementations.
  • Utilities for building servers, clients, and distributed systems with non-blocking I/O.
  • Integration capabilities with other Python components and WSGI/ASGI-facing web stacks.
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More About

Twisted is an open-source networking engine for Python that provides an event-driven framework for building asynchronous network applications, and it is positioned for use in environments where non-blocking I/O and concurrency across many network connections are required.

The framework centers on an event loop and a callback-based programming model, exposing core abstractions for protocols, transports, and reactors that allow developers to manage network connections, timers, and deferred results without blocking threads.

In enterprise and institutional environments, Twisted is used as a foundation for custom application servers, messaging gateways, and integration services that need to handle large numbers of simultaneous Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) connections, often integrating with existing Python-based business logic and data services.

Twisted includes protocol implementations for common application-layer protocols such as HTTP, SMTP, IMAP, POP3, SSH, and others (networking middleware), enabling organizations to implement custom servers or clients or extend these protocols with application-specific behavior.

The framework supports multiple transport and reactor backends, allowing it to operate across different operating systems and event notification mechanisms while presenting a uniform Application Programming Interface (API) for application code.

Compared with other asynchronous frameworks in the Python ecosystem, Twisted focuses on a comprehensive protocol and networking stack, with utilities for authentication, service management, and integration with existing system daemons and process supervisors.

From an architectural standpoint, Twisted encourages separation of protocol logic from transport details, so the same protocol implementation can run over different connection types, which is useful in modular enterprise architectures and service-oriented deployments.

For directory and taxonomy purposes, Twisted aligns with categories such as application infrastructure (networking middleware), application servers (Python-based), and asynchronous I/O frameworks, serving teams that design and operate custom networked services, message handling systems, or integration endpoints.

Our description of Twisted. Updated February 2026.

Market segments

  • Information Technology / Software & Services / IT Services / Internet Services & Infrastructure

Similar organizations

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