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gevent is a coroutine-based Python networking library that uses greenlet to provide a high-level synchronous API on top of the libev event loop. Features include: Fast event loop based on libev (epoll on Linux, kqueue on FreeBSD). Lightweight execution units based on greenlet. API that re-uses concepts from the Python standard library (for example there are Events and Queues). Cooperative sockets with SSL support » DNS queries performed through threadpool or c-ares. Monkey patching utility to get 3rd party modules to become cooperative »

Stackless Python, or Stackless, is a Python programming language interpreter, so named because it avoids depending on the C call stack for its own stack. The most prominent feature of Stackless is microthreads, which avoid much of the overhead associated with usual operating system threads. In addition to Python features, Stackless also adds support for coroutines, communication channels and task serialization.

Twisted is an event-driven network programming framework written in Python

Tornado is a scalable, non-blocking web server and web application framework written in Python.

The subprocess module allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. This module intends to replace several other, older modules and functions, such as: os.system os.spawn* os.popen* popen2.* commands.*