From CSV exports to a checked Excel report

I built this personal example around a small order file with duplicates, missing values and conflicting records. The Python tool checks each row, keeps the original file unchanged and creates an Excel report with a separate exception list.

Of 26 input rows, 16 are accepted, two exact duplicates are removed and eight rows are held for review. The accepted orders total $973.69. The sample shows the original rows, decisions and totals so you can follow the result.

The report contains finished values. Run the tool again when the input changes. The portable sample passed 14 processing tests and four export cases, including an empty result and text that looks like an Excel formula. This is fictional data, not a live customer system.