diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index ed15c0fd1f8afc..ba04be8f9058e1 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -738,7 +738,7 @@ def readlines(self, *args):
return self._file.readlines(*args)
def seek(self, *args):
- self._file.seek(*args)
+ return self._file.seek(*args)
def tell(self):
return self._file.tell()
diff --git a/Lib/test/test_tempfile.py b/Lib/test/test_tempfile.py
index f4cba0fa8dcf19..69d5de2e1b95f4 100644
--- a/Lib/test/test_tempfile.py
+++ b/Lib/test/test_tempfile.py
@@ -1018,7 +1018,8 @@ def test_writelines(self):
# Verify writelines with a SpooledTemporaryFile
f = self.do_create()
f.writelines((b'x', b'y', b'z'))
- f.seek(0)
+ pos = f.seek(0)
+ self.assertEqual(pos, 0)
buf = f.read()
self.assertEqual(buf, b'xyz')
@@ -1036,7 +1037,8 @@ def test_sparse(self):
# when that occurs
f = self.do_create(max_size=30)
self.assertFalse(f._rolled)
- f.seek(100, 0)
+ pos = f.seek(100, 0)
+ self.assertEqual(pos, 100)
self.assertFalse(f._rolled)
f.write(b'x')
self.assertTrue(f._rolled)
diff --git a/Misc/NEWS.d/next/Library/2020-04-15-17-21-48.bpo-40287.-mkEJH.rst b/Misc/NEWS.d/next/Library/2020-04-15-17-21-48.bpo-40287.-mkEJH.rst
new file mode 100644
index 00000000000000..d4db192b710768
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-04-15-17-21-48.bpo-40287.-mkEJH.rst
@@ -0,0 +1 @@
+Fixed ``SpooledTemporaryFile.seek()`` to return the position.
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