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Hot reload

In this How-To we are going to show how to speed up the development of Pglet Python apps with hot reload tool.

Pglet app consists of one or more .py files in app directory. It normally runs as any other Python app with python When any of .py files change, the application must be restarted. While you do a lot of small changes working to perfect your Pglet UI, those constant restarts could become very annoying.

watchexec is a simple, standalone tool that watches a path and runs a command whenever it detects modifications.

To install on macOS:

brew install watchexec

To install on Windows:

choco install watchexec

Other installation options

Now use the following command to call/restart python when any Python file in the current directory (and all subdirectories) changes:

watchexec -r -e py -- python

Once the app is restarted just hit refresh in your browser to reload it.

You also need to modify your Pglet app and set an application name to run on a permanent URL and disable browser opening on the start:"my-app", target=main, no_window=True)