CSV and JSONL — the two formats AI moves data in (step 6/9) · files and i/o

promptdojo_›phase 02 · real python›ch 10 · files and i/o

lesson 3 of 3 · csv and jsonl — the two formats ai moves data instep 6 / 9

AI wrote a CSV reader that "works on my machine" and breaks on Windows: every other row comes back blank because of how Windows line endings interact with csv.DictReader.

The fix is one keyword argument on the open call. Add newline="" to line 11 so the reader handles line endings correctly across platforms. The expected output is two rows printed.

The break is on line 11 — but read the whole snippet first.

⌘↵ runs the editor.read, then continue.

AI wrote a CSV reader that "works on my machine" and breaks on Windows: every other row comes back blank because of how Windows line endings interact with csv.DictReader.

The fix is one keyword argument on the open call. Add newline="" to line 11 so the reader handles line endings correctly across platforms. The expected output is two rows printed.

The break is on line 11 — but read the whole snippet first.

this step needs the editor

on desktop today; in the app (coming soon). save your spot and we'll bring you back here when you're ready.

save my spot follow @TFisPython for the app launch

open this same url on a laptop to keep going today.

CSV and JSONL — the two formats AI moves data in — step 6 of 9

this step needs the editor