import re

    MIXED_CSV_RE = re.compile(r"(?P<Metadata>.*:.*)\n(?P<CSV>(?:(?:\d+,)*(?:\d+)\n?)*)")

    header = next(fstr).strip().split(",")
    csvs = []
    comments = []
    for match in MIXED_CSV_RE.finditer(fstr.read()):
        csvs.extend(match.group("CSV").strip().split("\n"))
        comments.append(match.group("Metadata"))

    df = pd.DataFrame(csv.reader(csvs), columns=header)

    print(comments, header, df)