直到'requests”库支持指数退避的自动重试

您可以使用自定义适配器，并对所有 HTTP/HTTPS 请求强制以指数退避因子进行多次重试。请参阅下面的示例：

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")

这将返回以下错误：

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，似乎没有办法知道上述机制尝试了多少次重试，只有当所有尝试都已用尽时

参考

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

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