from humanfriendly import parse_size


rows_from_sqlite = [
    ("sister_nancy.mp3", "2 Mo"),
    ("sister_nancy.mp4", "600 Mo"),
    ("titles.txt", "7Ko"),
    ("backup.tar.bz2", "4GB"),
]

for row in sorted(rows_from_sqlite, key=lambda row: parse_size(row[1])):
    print(row)