Python: Resolving the error "make: No rule to make target 'run'"

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This error indicates that either a Makefile is missing in the root of your project or the existing Makefile does not define a run target.

To resolve this, you can create a Makefile in your project's root directory with the following example content:

run:
	ENV=production gunicorn app:app \
	--error-logfile - \
	-b 0.0.0.0:8080

This script starts a Gunicorn server, executes the app.py file with the Flask instance app, and listens on port 8080.

Consider using an enhanced Makefile to simplify running your development environment and deploying your application.