[Python] How can I set a single proxy for a requests session object?

I'm using the Python requests package to send http requests. I want to add a single proxy to the requests session object. eg.

session = requests.Session()
session.proxies = {...} # Here I want to add a single proxy


Currently I am looping through a bunch of proxies, and at each iteration a new session is made. I only want to set a single proxy for each iteration.

The only example I see in the documentation is:

proxies = {
"http": "http://10.10.1.10:3128",
"https": "http://10.10.1.10:1080",
}

requests.get("http://example.org", proxies=proxies)


I've tried to follow this, but to no avail. Here is my code from the script:

# eg. line = 59.43.102.33:80
r = s.get('http://icanhazip.com', proxies={'http': 'http://' + line})


But I get an error:

requests.packages.urllib3.exceptions.LocationParseError: Failed to parse 59.43.102.33:80


How is it possible to set a single proxy on a session object?

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