You can use a Tk::LabEntry widget instead of separate Label and Entry widgets. The result is identical, but it's a bit shorter to code.

This is not identical, because a LabEntry widget occupies only one cell, be it packed or gridded. This means that you can't easily align a number of vertically stacked LabEntries. (There are workarounds, but it's always easier to create Label and Entry seperately and use the grid geometry manager)