From 9990e8c264226f2b6b4883c28ced6437ce4d2b49 Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Sat, 18 Apr 2009 14:47:50 +0000
Subject: add annotations to open()

---
 Lib/_pyio.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 3fd1afe..0ef6822 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -35,8 +35,9 @@ class BlockingIOError(IOError):
         self.characters_written = characters_written
 
 
-def open(file, mode="r", buffering=None, encoding=None, errors=None,
-         newline=None, closefd=True):
+def open(file: (str, bytes), mode: str = "r", buffering: int = None,
+         encoding: str = None, errors: str = None,
+         newline: str = None, closefd: bool = True) -> "IOBase":
 
     r"""Open file and return a stream.  Raise IOError upon failure.
 
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