bpo-27497: Add return value to csv.DictWriter.writeheader (GH-12306)

csv.DictWriter.writeheader() now returns the return value of the
underlying csv.Writer.writerow() method.

Patch contributed by Ashish Nitin Patil.

1 files changed, 1 insertions, 1 deletions

diff --git a/Lib/csv.py b/Lib/csv.py
index eeeedab..dc85077 100644
--- a/Lib/csv.py
+++ b/Lib/csv.py
@@ -140,7 +140,7 @@ class DictWriter:
 
     def writeheader(self):
         header = dict(zip(self.fieldnames, self.fieldnames))
-        self.writerow(header)
+        return self.writerow(header)
 
     def _dict_to_list(self, rowdict):
         if self.extrasaction == "raise":