duckdns crontab with circular log

# create a folder with name .duckdns in the current user
# fill the domain and token fields in the code below
# then create a file with name duck.py and copy the lines starting with #!/usr/bin/python3
# chmod +x duck.py
# then create an entry in crontab with the line below
# */15 * * * * ~/.duckdns/duck.py >> ~/.duckdns/cron.log 2>&1



#!/usr/bin/python3

import time
import requests
from pathlib import Path

log_file = Path('~/.duckdns/duck.log').expanduser()
max_lines_of_log = 500
domain_name = ''
token = ''

payload = {'domains': domain_name, 'token': token, 'ip': ''}
response = requests.get('https://www.duckdns.org/update', params=payload)

with open(log_file, 'r+') as f:
        lines = f.readlines()

        if len(lines) >= max_lines_of_log:
                f.seek(0, 0)
                f.writelines(lines[1:])

        if response.status_code == 200 and response.text == 'OK':
                f.write(time.strftime('%Y-%m-%d %H:%M:%S') + ' INFO ' + str(response.status_code) + ' ' + response.text.replace('\r', '', 1000).replace('\n', ' ', 1000) + '\n')
        else:
                f.write(time.strftime('%Y-%m-%d %H:%M:%S') + ' ERROR ' + str(response.status_code) + ' ' + response.text.replace('\r', '', 1000).replace('\n', ' ', 1000) + '\n')

f.close()

I changed it to python from bash sed because it is soo compilacated to deal with response body when it includes special characters like < > carriage return and new line.