This is a weird one. DDG has been my search engine of choice for a number of years, so I also used it as the search engine for this site (since it's statically generated). At some point over the last 3 (I think) months it stopped working - returning no results for any search criteria. Given Bing provides at least some percentage of DDG's content, I went digging in Bing's webmaster tools and found this...
(The inspected URL is known to Bing but has some issues which are preventing indexation)
There were a few errors reported but nothing that seems like a major issue (missing "description" meta, etc), and the indexation issue is even more confounding when you click on the Live Url and see...
(URL can be indexed by Bing)
I fixed some of the most egregious errors, tried getting it to re-index, but regardless, nothing is searchable in DDG...
https://duckduckgo.com/?q=tkinter+site%3Ajasonrbriggs.com&t=h_&ia=web
And nothing in Bing...
https://www.bing.com/search?q=tkinter+site%3Ajasonrbriggs.com
But it seems Google has no problem...
https://www.google.com/search?q=tkinter+site%3Ajasonrbriggs.com
As a consequence, I've re-pointed the site search at google search, until I can figure something else out (perhaps Lunr?), but for the moment it seems like I don't exist in my search engine of choice. Sigh.