From daa738f70e92766545b99eccbcdd47da2d67fa70 Mon Sep 17 00:00:00 2001
From: Jaromir Latal <latal.jaromir@gmail.com>
Date: Sat, 22 Feb 2020 04:50:02 +0000
Subject: [PATCH] stdlib: csv.DictReader.fieldnames should be
 Optional[Sequence[str]] (#3752)

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

diff --git a/stdlib/2and3/csv.pyi b/stdlib/2and3/csv.pyi
index 47d9f5b41..1181f231c 100644
--- a/stdlib/2and3/csv.pyi
+++ b/stdlib/2and3/csv.pyi
@@ -55,7 +55,7 @@ class DictReader(Iterator[_DRMapping]):
     reader: _reader
     dialect: _DialectLike
     line_num: int
-    fieldnames: Sequence[str]
+    fieldnames: Optional[Sequence[str]]
     def __init__(
         self,
         f: Iterable[Text],