This example demonstrates how to download a YouTube video as an MP4 file using the `pytube` library, then shows the final step of saving the file locally with a simple print confirmation. The script first targets a specific video URL and filters available streams for progressive MP4 formats, ordering them by resolution in descending order to select the highest-quality option. After downloading, the code would rely on `moviepy.editor` and `eyed3` for potential post-processing, though the visible portion only handles the download itself. The example uses the `urllib` and `csv` modules implicitly, but the core action centers on `pytube`'s stream API.