Is there a good proxy checker for python3?

Question

Computers

Rummaged through the floor of the Internet and did not find a normal proxy checker.

Here is a screenshot of the proxy, I need it to take these proxies and check them directly in the code, and overwrite the proxies that work in the same file.
Please help, it's urgent.
Need code.

Answer 1

ftp://ftp.ts.fujitsu.com/pub/mainboard-oem-sales/p...

Answer 2

Proxy checker is done elementarily.
You go through the list of servers, using the requests library, make a request for a certain reference resource with the selected proxy, and compare the response with the response without a proxy. The answer coincided with the expected - add to the list of verified. Did not match or did not answer - in the list of unreliable.
In several threads, you simultaneously check several proxies.