From b44af2ebb274bfa50f544c76b7b0e383989a5c11 Mon Sep 17 00:00:00 2001
From: Kenny Do <kedo@patreon.com>
Date: Wed, 28 Feb 2018 18:36:27 -0800
Subject: [PATCH] tzinfo.tzname is optional

---
 stdlib/2and3/datetime.pyi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdlib/2and3/datetime.pyi b/stdlib/2and3/datetime.pyi
index 367b2a0d0014..786922773665 100644
--- a/stdlib/2and3/datetime.pyi
+++ b/stdlib/2and3/datetime.pyi
@@ -14,7 +14,7 @@ MINYEAR: int
 MAXYEAR: int
 
 class tzinfo:
-    def tzname(self, dt: Optional[datetime]) -> str: ...
+    def tzname(self, dt: Optional[datetime]) -> Optional[str]: ...
     def utcoffset(self, dt: Optional[datetime]) -> Optional[timedelta]: ...
     def dst(self, dt: Optional[datetime]) -> Optional[timedelta]: ...
     def fromutc(self, dt: datetime) -> datetime: ...