Python GUI Programming with Tkinter

Making our Spinbox a Ttk widget

If you're using Python 3.6 or earlier, the Spinbox widget is only available in tkinter, and not ttk.  We'll need to fix this so that our error-styling can be consistent.

At the time of writing this book, the author has submitted a patch to Python 3.7 to include the Ttk Spinbox. If you're using Python 3.7 or later, you can just use ttk::spinbox and skip this section.

Since Spinbox is already in the Tcl/Tk Ttk library, creating a Python class for it is surprisingly easy.

Add this code near the top of widgets.py:

class TtkSpinbox(ttk.Entry):

    def __init__(self, parent=None, **kwargs):
        super().__init__(parent, 'ttk::spinbox', **kwargs)

This is all that's needed to create a Ttk Spinbox for this application. We're ...