Developers can transform a Python package into a command-line tool by declaring a console_scripts entry point in their package metadata. After activating a virtual environment, running pip install -e . places an executable wrapper in the venv's bin directory. This approach is the modern standard over legacy script copying methods.

The technique requires a project layout with a source file containing a `main()` function. Build configuration is defined in either pyproject.toml (using setuptools) or setup.cfg, where the entry point maps a command name like `mycmd` to the target function. This metadata is parsed during installation to create the OS-appropriate wrapper script.

Always activate your virtual environment before installing to ensure the command lands locally, not in the system Python path. The -e (editable) flag is crucial for development, as it allows immediate code changes to reflect when running the command. This method integrates cleanly with dependency resolution and works across Unix, macOS, and Windows.

While this guide covers the core mechanism, libraries like Click or Typer simplify building richer CLI applications. The underlying entry point syntax remains identical, pointing to the function that invokes the full CLI framework. This foundational skill enables developers to distribute reusable tools within their Python ecosystem.