Demo project with a sample script and data, not a client project.
A Python sales report stopped with "KeyError: 'date'"; after a quick patch it ran, but the numbers were wrong.
3 real causes: a hidden character that Excel adds to CSV files, dates read as month/day, and a loop that skipped the first sale.
Each fix is a separate commit, with 3 tests on the real export: before 3 failed, after 3 passed. The client gets the fixed script and a short report.
0 likes · 0 views · Nov 12, 2026
A Python sales report that crashed, then gave wrong totals. 3 real causes fixed, 3 tests passed, a short report for the client. Demo.
