FDA reference preview: save join.py and all five CSV files in one folder.
Run: python join.py --reference . --input input.csv --output demo.csv
Compare demo.csv with expected.csv. Standard-library Python only; no network requests.
Inventory quantities are synthetic; reference records are real, deliberately selected edge cases.
These tiny reference tables are NOT the full reference; do not use them to estimate buyer coverage.
Source edition: 2026-10-09
Candidate: 1863f8bbcfbdc214927c0e9cddab7a1d2aa81e0cdab73a8e5b435b8215ecf123