直到「requests」庫支援指數退避的自動重試

您可以使用自訂適配器，並對所有 HTTP/HTTPS 請求強制以指數退避因子進行多次重試。請參閱下面的範例：

import requests
from requests import adapters
from urllib3.util import Retry

# Create a transport adapter with a custom retry strategy.
retries = Retry(
    total=3,
    backoff_factor=3,
    status_forcelist=[500, 502, 503, 504]
)
adapter = adapters.HTTPAdapter(max_retries=retries)

# Ensure adapter is used for both HTTP and HTTPS requests.
session = requests.Session()
session.mount('https://', adapter)
session.mount('http://', adapter)

# Testing the retry mechanism
response = session.get("http://httpbin.org/status/500")

這將傳回以下錯誤：

RetryError: HTTPConnectionPool(host='httpbin.org', port=80): Max retries exceeded with url: /status/500 (Caused by ResponseError('too many 500 error responses'))

不幸的是，似乎沒有辦法知道上述機制嘗試了多少次重試，只有當所有嘗試都已用盡時

參考

https://stackoverflow.com/a/47475019/4477547

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