deltacycle 0.8.0

Delta Cycle

Delta Cycle

DeltaCycle is a Python library for discrete event simulation (DES). Processes are described by async def coroutine functions, and concurrency is implemented using async / await statements.

In DES, the simulation is subdivided into sequential slots. Each slot is assigned a monotonically increasing integer value, called "time". Multiple events may happen during each time slot. Those events will trigger tasks that execute in zero time, which may schedule additional events for present or future time slots. The term "delta cycle" refers to a zero-delay subdivision of a time slot.

DeltaCycle implements a fixed-priority task scheduling algorithm. This allows fine-grain control over the task execution order from simultaneous events.

Read the docs! (WIP)

Features

Example

The following code simulates two clocks running concurrently. The fast clock prints the current time every time step. The slow clock prints the current time every two time steps.

>>> from deltacycle import create_task, now, run, sleep

>>> async def clock(name: str, period: int):
...     while True:
...         print(f"{now()}: {name}")
...         await sleep(period)

>>> async def main():
...     create_task(clock("fast", 1))
...     create_task(clock("slow", 2))

>>> run(main(), until=7)
0: fast
0: slow
1: fast
2: slow
2: fast
3: fast
4: slow
4: fast
5: fast
6: slow
6: fast

Installing

DeltaCycle is available on PyPI:

$ pip install deltacycle

It supports Python 3.12+

Developing

DeltaCycle's repository is on GitHub:

$ git clone https://github.com/cjdrake/deltacycle.git

It is 100% Python, and has no runtime dependencies. Development dependencies are listed in requirements-dev.txt.