SimPy

When to Use This Skill

Use the SimPy skill when:

1. Modeling discrete-event systems - Systems where events occur at irregular intervals
2. Resource contention - Entities compete for limited resources (servers, machines, staff)
3. Queue analysis - Studying waiting lines, service times, and throughput
4. Process optimization - Analyzing manufacturing, logistics, or service processes
5. Network simulation - Packet routing, bandwidth allocation, latency analysis
6. Capacity planning - Determining optimal resource levels for desired performance
7. System validation - Testing system behavior before implementation

Not suitable for:

• Continuous simulations with fixed time steps (consider SciPy ODE solvers)
• Independent processes without resource sharing
• Pure mathematical optimization (consider SciPy optimize)

Basic Simulation Structure

import simpy

def process(env, name):
    """A simple process that waits and prints."""
    print(f'{name} starting at {env.now}')
    yield env.timeout(5)
    print(f'{name} finishing at {env.now}')

## Start processes

env.process(process(env, 'Process 1'))
env.process(process(env, 'Process 2'))