data_prepare

import re
import json

regex_pattern = r"^logzero_default - (\d{4}-\d\d-\d\d).*INFO: ([a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+), \d*. (.*).zip$"
input_file = 'logfile.log'

def return_rows(input_file):
    with open(input_file, 'r') as inputf:
        return inputf.read().splitlines()

data_list = [re.split(regex_pattern, row) for row in return_rows(input_file)]

versions_set = list(set(version[3] for version in data_list))

data_dict = {ver: {date: list() for date in (set(date[1] for date in data_list))} for ver in versions_set}

for row in data_list:
    data_dict[row[3]][row[1]].append(row[2])

with open("data.json", "w") as json_file:
    json.dump(data_dict, json_file)