commit 9796fe88da7415925b3e8f7e0a5e55301548734f
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Fri Apr 17 00:14:55 2020 -0700
committer GitHub <noreply@github.com> Fri Apr 17 00:14:55 2020 -0700
tree a3a99fe4340b50a4ce692c263e6bcb717ab24d31
parent 6b0ca0aeab04d7b7b54086248ca9d5e70f770f2f

bpo-40287: Fix SpooledTemporaryFile.seek() return value (GH-19540)


It has not returned the file position after the seek.
(cherry picked from commit 485e715cb1ff92bc9882cd51ec32589f9cb30503)

Co-authored-by: Inada Naoki <songofacandy@gmail.com>

Lib/tempfile.py

diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index 6287554..5b990e0 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -735,7 +735,7 @@
         return self._file.readlines(*args)
 
     def seek(self, *args):
-        self._file.seek(*args)
+        return self._file.seek(*args)
 
     @property
     def softspace(self):

Lib/test/test_tempfile.py

diff --git a/Lib/test/test_tempfile.py b/Lib/test/test_tempfile.py
index 232c5da..f129454 100644
--- a/Lib/test/test_tempfile.py
+++ b/Lib/test/test_tempfile.py
@@ -1025,7 +1025,8 @@
         # 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')
 
@@ -1043,7 +1044,8 @@
         # 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)