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Simple offline task queues.

Project Description

Simple offline task queues. For Python.

“See you later, alligator.”

Latest documentation at


  • Python 2.6+ or Python 3.3+
  • (Optional) redis for the Redis backend
  • (Optional) beanstalkc for the Beanstalk backend
  • (Optional) PyYAML for the Beanstalk backend
  • (Optional) boto>=2.35.0 for the SQS backend


  • Because I have NIH-syndrome.
  • Or because I longed for something simple (~375 loc).
  • Or because I wanted something with tests (90%+ coverage) & docs.
  • Or because I wanted pluggable backends.
  • Or because testing some other queuing system was a pain.
  • Or because I’m an idiot.

Basic Usage

This example uses Django, but there’s nothing Django-specific about Alligator.

I repeat, You can use it with any Python code that would benefit from background processing.

from alligator import Gator

from django.contrib.auth.models import User
from django.shortcuts import send_email

# Make a Gator instance.
# Under most circumstances, you would configure this in one place &
# import that instance instead.
gator = Gator('redis://localhost:6379/0')

# The task itself.
# Nothing special, just a plain *undecorated* function.
def follow_email(followee_username, follower_username):
    followee = User.objects.get(username=followee_username)
    follower = User.objects.get(username=follower_username)

    subject = 'You got followed!'
    message = 'Hey {}, you just got followed by {}! Whoohoo!'.format(
    send_email(subject, message, '', [])

# An simple, previously expensive view.
def follow(request, username):
    # You'd import the task function above.
    if request.method == 'POST':
        # Schedule the task.
        # Use args & kwargs as normal.
        gator.task(follow_email, request.user.username, username)
        return redirect('...')

Running Tasks

Rather than trying to do autodiscovery, fanout, etc., you control how your workers are configured & what they consume.

If your needs are simple, run the included worker:

$ python redis://localhost:6379/0

If you have more complex needs, you can create a new executable file (bin script, management command, whatever) & drop in the following code.

from alligator import Gator, Worker

# Bonus points if you import that one pre-configured ``Gator`` instead.
gator = Gator('redis://localhost:6379/0')

# Consume & handle all tasks.
worker = Worker(gator)



Future Wishlist

These things aren’t present yet, but maybe someday they will be.

# Delayed tasks (run in an hour).
with gator.options(run_after=60 * 60) as task:

# Dependent tasks, will only run if the listed tasks succeed.
# Maybe.
with gator.options(depends_on=[feeds_job]) as task:

Running Tests

Alligator has 95%+ test coverage & aims to be passing/stable at all times.

If you’d like to run the tests, clone the repo, then run:

$ virtualenv env2
$ . env2/bin/activate
$ pip install -r requirements.txt
$ python develop
$ py.test -s -v --cov=alligator --cov-report=html tests


  • Scheduled tasks
  • Dependent tasks

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Filename, Size & Hash SHA256 Hash Help File Type Python Version Upload Date
(18.3 kB) Copy SHA256 Hash SHA256
Wheel 2.7 Jan 12, 2015
(330.8 kB) Copy SHA256 Hash SHA256
Source None Jan 12, 2015

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