requests_retries.py

import requests
from requests.packages.urllib3.util.retry import Retry
from requests.adapters import HTTPAdapter

s = requests.Session()

# https://urllib3.readthedocs.io/en/latest/reference/urllib3.util.html
# backoff_factor (float) –
# A backoff factor to apply between attempts after the second try (most errors are resolved immediately 
# by a second try without a delay). urllib3 will sleep for:
#
# {backoff factor} * (2 ** ({number of total retries} - 1))
# seconds. If the backoff_factor is 0.1, then sleep() will sleep for [0.0s, 0.2s, 0.4s, …] between retries. 
# It will never be longer than Retry.BACKOFF_MAX.
#
# By default, backoff is disabled (set to 0).
#
# See https://findwork.dev/blog/advanced-usage-python-requests-timeouts-retries-hooks/
# for a good writeup of Python requests retries and timeouts
#

retries = Retry(total=5, backoff_factor=0.1, status_forcelist=[500, 502, 503, 504])
s.mount('https://', HTTPAdapter(max_retries=retries))

r = s.get('https://www.example.com')
if r.status_code == 200:
    print("Success: Downloaded data")
else:
    print("Error: failed to download data")