rows = list(islice(reader, 50)) exhausts the csv.reader, then remaining = sum(1 for _ in reader) iterates the same already-exhausted iterator, always yielding 0. The caption ...and N more rows will never appear, silently hiding truncated data with no user feedback.
rows = list(islice(reader, 50))exhausts the csv.reader, thenremaining = sum(1 for _ in reader)iterates the same already-exhausted iterator, always yielding 0. The caption...and N more rowswill never appear, silently hiding truncated data with no user feedback.