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162 Stars 15 Forks MIT License 360 Commits 5 Opened issues


in-process file monitor / reloader for reloading your code automatically during development

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is an integrated process monitor that will track changes to any imported Python files in
as well as custom paths. When files are changed the process is restarted.

Command-line Usage

Hupper can load any Python code similar to

python -m 
by using the
hupper -m 

.. code-block:: console

$ hupper -m myapp Starting monitor for PID 23982.

API Usage

Start by defining an entry point for your process. This must be an importable path in string format. For example,


.. code-block:: python

# myapp/scripts/

import sys import hupper import waitress

def wsgi_app(environ, start_response): start_response('200 OK', [('Content-Type', 'text/plain')]) yield b'hello'

def main(args=sys.argv[1:]): if '--reload' in args: # start_reloader will only return in a monitored subprocess reloader = hupper.start_reloader('myapp.scripts.serve.main')

    # monitor an extra file



is inspired by initial work done by Carl J Meyer and David Glick during a Pycon sprint and is built to be a more robust and generic version of Ian Bicking's excellent PasteScript
paste serve --reload
and Pyramid's
pserve --reload

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