simpy

Builds, tests, and analyzes bounded process-based discrete-event simulations in Python with SimPy 4.1.2: Environment, Timeout, Process, AnyOf/AllOf conditions, interrupts, Resource, PriorityResource, PreemptiveResource, Container, Store, time-weighted monitoring, and replication-based output analysis, plus bundled safe CLIs. Use when modeling queues, production lines, logistics, or service operations with generator processes; when contending entities need shared resources or preemption; when instrumenting queue length or utilization correctly; when running independent replications with seeds and confidence intervals; when debugging event ordering or run(until=) boundaries. Not for continuous-time ODE or agent-based modeling frameworks.

Version

1.4

License

MIT

Compatibility

Upstream SimPy 4.1.2 supports Python 3.8+; bundled CLIs require Python 3.10+, uv, and SimPy 4.1.2. They use only SimPy and the standard library, operate on local bounded inputs, and make no network calls.