Parse Nginx "access.log" file to python object or json

main.py

def main():
    ng = nginx.Nginx()
    logs_parsed = ng.get_obj_parsed_logs('input.log')
    for log in logs_parsed:
        print(f'{log.date} {log.ip} {log.url} {log.bytes_sent} {log.referrer} {log.user_agent} {log.status} {log.method}')

    ng.save_json_parsed_logs('input.log', 'output.josn')


if __name__ == "__main__":
    main()

nginx.py

# Ref: https://gist.github.com/hreeder/f1ffe1408d296ce0591d
import re
from datetime import datetime

class Nginx:
    def __init__(self):
        self.__log_format = re.compile(r"""(?P<ipaddress>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}) - - \[(?P<dateandtime>\d{2}\/[a-z]{3}\/\d{4}:\d{2}:\d{2}:\d{2} (\+|\-)\d{4})\] ((\"(GET|POST) )(?P<url>.+)(http\/1\.1")) (?P<statuscode>\d{3}) (?P<bytessent>\d+) (["](?P<refferer>(\-)|(.+))["]) (["](?P<useragent>.+)["])""",re.IGNORECASE)
        self.__input_file_name = ''
        self.__output_file_name = ''
        self.parsed_logs = list()

    def __parser(self):
        self.parsed_logs.clear()
        try:
            with open(self.__input_file_name, 'r') as f:
                for log in f.readlines():
                    data = re.search(self.__log_format, log)
                    if data:
                        data_dict = data.groupdict()
                        date = datetime.strptime(data_dict["dateandtime"], "%d/%b/%Y:%H:%M:%S %z").strftime("%Y-%m-%d %H:%M:%S")
                        self.parsed_logs.append(NginxLogs(data_dict["ipaddress"], date, data_dict["url"], data_dict["bytessent"], data_dict["refferer"], data_dict["useragent"], data_dict["statuscode"], data.group(6)))
        except:
            raise Exception(f'Cannot open Nginx log file: {self.__input_file_name}')

    def __write_file(self):
        try:
            with open(self.__output_file_name, 'a+') as f:
                for log in self.parsed_logs:
                    f.write(f'{vars(log)}\n')
        except:
            raise Exception(f'Cannot create Nginx output log file: {self.__output_file_name}')

    def get_obj_parsed_logs(self, input_file_name):
        self.__input_file_name = input_file_name
        self.__parser()
        return self.parsed_logs

    def save_json_parsed_logs(self, input_file_name, output_file_name):
        self.__input_file_name = input_file_name
        self.__output_file_name = output_file_name
        self.__parser()
        self.__write_file()


class NginxLogs:
    def __init__(self, ip, date, url, bytes_sent, referrer, user_agent, status, method):
        self.ip = ip
        self.date = date
        self.url = url
        self.bytes_sent = bytes_sent
        self.referrer = referrer
        self.user_agent = user_agent
        self.status = status
        self.method = method