[mmerickel]

My project, hupper [1], isn't hot reloading but it's worth mentioning in this thread alongside other code reloaders. It is a general purpose tool to monitor python code and reload the process when code changes. You can use it with any script that you're working on via `hupper -m foo` and your `foo.py` is then reloaded/re-executed everytime you change it. It's used under the hood in other tools to implement things like `pserve --reload` in Pyramid and is used in Warehouse (the codebase for PyPI) to ease development workflows.

It's an improvement on some previous attempts at the solution that would crash when reloading invalid code. Hupper does not have this problem due to its multi process design.

[1] https://docs.pylonsproject.org/projects/hupper/en/latest/