ExcelPy: From Tkinter Prototype to AI-Assisted Workbook Review

This is a submission for the GitHub Finish-Up-A-Thon Challenge What I Built I rebuilt ExcelPy from an unfinished desktop stock-comparison prototype into a working spreadsheet QA workspace for teams that need to compare an older, trusted workbook against a newer one before publishing pricing, catalog, or inventory changes. The original was a Tkinter script with file pickers. It could select two .xlsx files, but the actual comparison logic, validation, mismatch handling, and reporting...