Python 2.7 (no SNI support) is the new Windows XP. Not a browser problem, but if you're building an API, it will lock people out.
(sorry to beat a dead horse, but it's burned me recently and I think people are flipping the https only switch without awareness or consideration. doesn't mean "don't switch", but be aware.)
Note that many people don't use requests, which has a rather large dependency chain, and sometimes you don't have much choice. e.g., feedparser doesn't use requests, nor is it likely to because of the dependencies. PEP 466 https://www.python.org/dev/peps/pep-0466 has more information, too.
(sorry to beat a dead horse, but it's burned me recently and I think people are flipping the https only switch without awareness or consideration. doesn't mean "don't switch", but be aware.)