bpo-41425: Make tkinter doc example runnable (GH-21706)

Co-authored-by: Ankit Chandawala <achandaw@amazon.com>
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
(cherry picked from commit c36dbac588e1d99975f285a874bb20e9f5040af4)
2 files changed