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Upendra and Eric: get_list_data() should first parse the string into a list of lines with .splitlines. At some point, I think the scrolled list should become a scrolled ttk.Treeview, which can have multiple columns. Then get_line_data should parse each line into name and version. Then a third column can be added to indicate that a newer version is available. I wish I had that right now. I have forgotten how to get the update-available info.
Alexander, the screenshot could not be more timely. I was thinking of only putting something in the third column when an update is available, but that is a minor detail.
In any case, the point is that the get_list_data should eventually prepare a package-list-specific list of triples that gets fed to show_list_data.