From 8e89faa90ff04a3b7e7085d7ff2530cfe8735765 Mon Sep 17 00:00:00 2001
From: William Ayd <william.ayd@icloud.com>
Date: Wed, 17 Jul 2019 01:08:46 -0700
Subject: [PATCH] Added Optional (#3125)

Fixes #3124
---
 stdlib/3/io.pyi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdlib/3/io.pyi b/stdlib/3/io.pyi
index 903fab2f6..e64890281 100644
--- a/stdlib/3/io.pyi
+++ b/stdlib/3/io.pyi
@@ -159,7 +159,7 @@ class TextIOWrapper(TextIO):
     def __init__(
         self,
         buffer: IO[bytes],
-        encoding: str = ...,
+        encoding: Optional[str] = ...,
         errors: Optional[str] = ...,
         newline: Optional[str] = ...,
         line_buffering: bool = ...,