Python urllib with proxy not working while C# works - c#

I am trying to get data from an API using python 'urllib.request'. My requests sometime need to post json data.
My network is behind a proxy
When i try to get the data using C# code, everything works great:
WebClient wc = new WebClient();
WebProxy wp = new WebProxy("{IP}", 8080);
wc.Proxy = wp;
var request = "https://{API address and params}";
Uri serviceUri = new Uri(request);
string download = wc.DownloadString(serviceUri);
My python code is:
import urllib
address = "https://{API address and params}"
req = urllib.request.Request(address)
req.set_proxy("{IP}:8080", "http")
response = urllib.request.urlopen(req)
My python code throws a 400 error code exception - 'bad request'
What am i doing wrong?

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