Python’s requests library takes a proxies dictionary. Both http and https keys should point at the same proxy URL. The URL is scheme, user, password, host, port. Fill those from the vendor dashboard. Do not copy a blog’s expired port as if it were a standard.
The shape
Build the URL as http://USER:PASSWORD@HOST:PORT. Pass it as both http and https in the proxies dict. Then GET a public IP echo. Print the body. If it is still your office address, the tunnel did not attach. If it is an address you do not recognise, the proxy is in the path. Then, and only then, request a URL you are allowed to collect.
Timeouts and retries
A missing timeout will hang a worker. Set one. A retry still burns gigabytes. Count retries in the visit calculator, not as a free extra.
Legitimate use
Public pages you are allowed to collect, ad verification, SEO monitoring you are allowed to run, geo tests of properties you control. Not logins you do not own, not paywalls, not ticket queues.
Orange “Open” buttons can be affiliate. They do not change the editorial order. Confirm the live rate before you pay.