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I think this patch should be reverted. It breaks backwards compatibility:
 import socket
 sock0 = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
 sock = socket.socket(
 socket.AF_INET, socket.SOCK_STREAM, 0, sock0.fileno())
 sock0.close()
 sock.close()
This code behaves differently on 3.5 vs 3.6.
In uvloop (https://github.com/magicstack/uvloop) I create Python sockets for libuv socket handles. Sometimes, those handles are closed by libuv, and I have no control over that. So right now, a lot of uvloop tests fail because socket.close() now can raise an error.
It also doesn't make any sense to raise it anyways. socket.close() *must* be safe to call even when the socket is already closed.