#GtkCellRendererSpin renders text in a cell like #GtkCellRendererText from which it is derived. But while #GtkCellRendererText offers a simple entry to edit the text, #GtkCellRendererSpin offers a #GtkSpinButton widget. Of course, that means that the text has to be parseable as a floating point number.
Fluent builder for gtk.cell_renderer_spin.CellRendererSpin
Fluent builder implementation template for gtk.cell_renderer_spin.CellRendererSpin
Module for CellRendererSpin class