<div align="center">
# HMR for Python
<sup> on-demand · fine-grained · push-pull reactivity </sup>
[](https://pypi.org/project/hmr/)
[](https://github.com/promplate/pyth-on-line/blob/reactivity/packages/hmr/pyproject.toml)
[](https://pepy.tech/projects/hmr)
</div>
HMR means Hot Module Reload / [Hot Module Replacement](https://webpack.js.org/concepts/hot-module-replacement/). It is a feature that allows part of your app to be updated at runtime without a full rerun.
- The module whose source file **you changed** will rerun
- The module / function that **depends on** the changed module will rerun
- Other modules that are unaffected (like third-party libraries) will not rerun
Thus, in contrast to the traditional way of **cold-reloading** Python applications (like [watchfiles CLI](https://watchfiles.helpmanual.io/cli/)), HMR is just more efficient.
Unlike static-analysis tools like [Tach](https://github.com/gauge-sh/tach), HMR works by tracking the dependencies between names and modules **during runtime** through a [reactive system](https://wikipedia.org/wiki/Reactive_programming).
## Usage
If you are running your entry file with `python foo.py bar baz ...`, you can just replace it with `hmr foo.py bar baz ...`.
You can also try it with `uvx` or `pipx`. If you are using a virtual environment, it is recommended to install `hmr` in the virtual environment instead of globally.
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"description": "<div align=\"center\">\n\n# HMR for Python\n\n<sup> on-demand \u00b7 fine-grained \u00b7 push-pull reactivity </sup>\n\n[](https://pypi.org/project/hmr/)\n[](https://github.com/promplate/pyth-on-line/blob/reactivity/packages/hmr/pyproject.toml)\n[](https://pepy.tech/projects/hmr)\n\n</div>\n\nHMR means Hot Module Reload / [Hot Module Replacement](https://webpack.js.org/concepts/hot-module-replacement/). It is a feature that allows part of your app to be updated at runtime without a full rerun.\n\n- The module whose source file **you changed** will rerun\n- The module / function that **depends on** the changed module will rerun\n- Other modules that are unaffected (like third-party libraries) will not rerun\n\nThus, in contrast to the traditional way of **cold-reloading** Python applications (like [watchfiles CLI](https://watchfiles.helpmanual.io/cli/)), HMR is just more efficient.\n\nUnlike static-analysis tools like [Tach](https://github.com/gauge-sh/tach), HMR works by tracking the dependencies between names and modules **during runtime** through a [reactive system](https://wikipedia.org/wiki/Reactive_programming).\n\n## Usage\n\nIf you are running your entry file with `python foo.py bar baz ...`, you can just replace it with `hmr foo.py bar baz ...`.\n\nYou can also try it with `uvx` or `pipx`. If you are using a virtual environment, it is recommended to install `hmr` in the virtual environment instead of globally.\n",
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