Skip to main content

Asyncio Time Travel Loop

Project description

Asyncio Time Travel Loop


Asyncio Time Travel Loop allows you to test asyncio code that waits or sleeps,
without actually waiting or sleeping.

At the same time, you don't have to bother thinking about how the time
advances. Your code should work exactly the same with TimeTravelLoop as it works
with a normal asyncio events loop.

Example: Assume that you have a code that waits 1000 seconds, and you want to
tests that code. Instead of actually waiting 1000 seconds, you could use

import asyncio
from asyncio_time_travel import TimeTravelLoop


tloop = TimeTravelLoop()

def inner_cor():
# Sleep for a long time:
yield from asyncio.sleep(SLEEP_TIME,loop=tloop)


This code completes immediately.

See some of the [tests]( for more advanced examples of what TimeTravelLoop can do.

pip install --pre asyncio-time-travel
You can also find the package at .


Run (Inside asyncio_time_travel dir):

If you haven't yet heard of [py.test](, it's your lucky day :)

How does this work?

TimeTravelLoop source is based on the source code of

For each _run_once iteration of the loop, the following is done:
- Loop events are executed.
- Time is advanced to the closest scheduled event.

Using this method your code never waits, and at the same time the events
execute in the correct order.


TimeTravelLoop is meant to be used with your tests, not for production code. In
particular, if your loop interacts with external events, bending time is not a
good idea (Time will advance differently outside of your loop).

Further work

- The code might have bugs. If you find any issues, don't hesitate to fork or
open an issue.

- It might be possible to integrate this code into asyncio.test_utils in some

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for asyncio-time-travel, version 0.1.3
Filename, size File type Python version Upload date Hashes
Filename, size asyncio_time_travel-0.1.3-py3-none-any.whl (9.3 kB) File type Wheel Python version py3 Upload date Hashes View

Supported by

Pingdom Pingdom Monitoring Google Google Object Storage and Download Analytics Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page