parsing clippings from kindle into json

clippings.py

quotes = [q.split("\n") for q in txt.split("==========\n")]

import re
from datetime import datetime
import json

re_page = re.compile("- Your Highlight on page ([\d\-]+)")
re_loc = re.compile(".*Location ([\d\-]+)")
re_date = re.compile("Added on (.*[AM|PM])")

def parse_date(d_str):
    return datetime.strptime(d_str, "%A, %B %d, %Y %I:%M:%S %p")

ret = {}

for q in quotes:

    a_m = re.findall(r"\(([^\(\)]+)\)", q[0])
    author = a_m[-1] if a_m else None

    if author:
        book = q[0].replace(" ({})".format(author), "")
    else:
        book = q[0]

    page_m = re.search(re_page, q[1])
    page = page_m[1] if page_m else None

    loc_m = re.search(re_loc, q[1])
    loc = loc_m[1] if loc_m else None

    date_m = re.search(re_date, q[1])
    date = parse_date(date_m[1]).isoformat() if date_m else None

    data = {"date": date,
            "page": page,
            "loc": loc,
            "quote": "\n".join(q[2:]).strip()}

    if book not in ret:
        ret[book] = {"author": author,
                     "quotes": [data]}
    else:
        ret[book]["quotes"].append(data)


print(json.dumps(ret, indent=4, sort_keys = True))