Request thro proxy in python-spdylay clien

[velopokatun]

Good afternoon. It is necessary to write on Python 3.6 client which through SPDY connect to URL through a proxy and will receive result.The launched the server and the client in the test, this is works. But how to add a proxy I do not understand.
In the terminal client - spdycat, this is makes a simple:
spdycat -P <proxy-port> -p <proxy-host> http://Required.URL
And i can run this comand under the subprocess, but how to achieve this in the python implementation I do not understand.
I would really appreciate any help