python-greenlet/greenlet

Health v2 · maintenance only

Flags: no_releases no_license

Adoption not part of the score

1840 stars · 272 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Greenlet is a C extension for CPython providing lightweight in-process coroutines (micro-threads) with no implicit scheduling. It lets developers build custom control flow structures and is the foundation for libraries like Gevent and Eventlet.

Use cases

• run cooperative coroutines in-process without OS threads
• build custom schedulers or micro-thread frameworks
• implement generators that yield from nested function calls
• power concurrent networking libraries like gevent or eventlet
• switch execution contexts explicitly for advanced control flow

When to choose

• you need fine-grained, explicit control over coroutine switching
• you're building or using cooperative concurrency libraries like gevent
• you want lightweight concurrency without implicit scheduling overhead

When to avoid

• you only need simple async/await, which modern Python supports natively
• you need true parallelism across CPU cores
• you want implicit scheduling of tasks rather than manual switching

Facets

library · maturity stable

concurrency developer-tools backend python cross-platform coroutines micro-threads c-extension cooperative-scheduling

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