This is my first Python program. I tried to follow some best practices, but the code WILL show some of my beginner habits. I'll tweak things to correct that if I have time.

Each run accepts one puzzle, then either auto-fills obvious answers or uses the process of elimination to narrow down the remaining answers to a small number of candidates. We do NOT do recursion yet, but that might be the only way to solve stubborn puzzles. You may input a puzzle (symbols and spaces) as a single paste, or line by line. Easier puzzles will be solved, but I found harder ones that it cannot solve. In that case, make a reasonable guess and it may be able to finish it off... or not.

Current status: Correctly solves some puzzles, with prodding by the user.

Possible improvements: -don't print(), use logging -allow 'solver' to be called recursively -be more pythonic -some places can use sets instead of lists -this is a learning project. It may change for no good reason.