From b47213020124bb2e09c143b562205eaf4cde8fe2 Mon Sep 17 00:00:00 2001
From: "NODA, Kai" <nodakai@gmail.com>
Date: Mon, 9 Apr 2018 14:17:32 +0800
Subject: [PATCH] Improve asyncio APIs which take TCP port (#2006)

They have getaddrinfo(3) as their backend, and accept port='http' etc. You can even omit (pass None to) either of host or port for start_server() to effectively select 'localhost' and an arbitrary ephemeral port, respectively.
---
 stdlib/3.4/asyncio/streams.pyi | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/stdlib/3.4/asyncio/streams.pyi b/stdlib/3.4/asyncio/streams.pyi
index e46904e11..2892d95ab 100644
--- a/stdlib/3.4/asyncio/streams.pyi
+++ b/stdlib/3.4/asyncio/streams.pyi
@@ -1,5 +1,5 @@
 import sys
-from typing import Any, Awaitable, Callable, Generator, Iterable, List, Optional, Tuple
+from typing import Any, Awaitable, Callable, Generator, Iterable, List, Optional, Tuple, Union
 
 from . import coroutines
 from . import events
@@ -23,7 +23,7 @@ class LimitOverrunError(Exception):
 @coroutines.coroutine
 def open_connection(
     host: str = ...,
-    port: int = ...,
+    port: Union[int, str] = ...,
     *,
     loop: Optional[events.AbstractEventLoop] = ...,
     limit: int = ...,
@@ -33,8 +33,8 @@ def open_connection(
 @coroutines.coroutine
 def start_server(
     client_connected_cb: _ClientConnectedCallback,
-    host: str = ...,
-    port: int = ...,
+    host: Optional[str] = ...,
+    port: Optional[Union[int, str]] = ...,
     *,
     loop: Optional[events.AbstractEventLoop] = ...,
     limit: int = ...,