python · xzy3 · Oct 19, 2020 · Nov 2, 2020
diff --git a/Lib/tempfile.py b/Lib/tempfile.py
@@ -499,6 +499,9 @@ def close(self):
        """
        self._closer.close()

+    def __next__(self):
+        return next(self.file)
+
    # iter() doesn't use __getattr__ to find the __iter__ method
    def __iter__(self):
        # Don't return iter(self.file), but yield from it to avoid closing

diff --git a/Lib/test/test_tempfile.py b/Lib/test/test_tempfile.py
@@ -886,6 +886,16 @@ def make_file():
            self.assertEqual(l, lines[i])
        self.assertEqual(i, len(lines) - 1)

+    def test_next(self):
+        lines = [b'spam\n', b'eggs\n', b'beans\n']
+        with tempfile.NamedTemporaryFile(mode='w+b') as fd:
+            fd.write(b''.join(lines))
+            fd.seek(0)
+
+            self.assertEqual(list(fd), lines)
+            with self.assertRaises(StopIteration):
+                next(fd)
+
    def test_creates_named(self):
        # NamedTemporaryFile creates files with names
        f = tempfile.NamedTemporaryFile()

diff --git a/Misc/ACKS b/Misc/ACKS
@@ -1599,6 +1599,7 @@ Kirill Simonov
 Nathan Paul Simons
 Guilherme Simões
 Adam Simpkins
+Seth Sims
 Karthikeyan Singaravelan
 Mandeep Singh
 Ravi Sinha

diff --git a/Misc/NEWS.d/next/Library/2020-07-10-14-33-52.bpo-41270.pjUqyd.rst b/Misc/NEWS.d/next/Library/2020-07-10-14-33-52.bpo-41270.pjUqyd.rst
@@ -0,0 +1 @@
+Added :func:`tempfile._TemporaryFileWrapper.__next__` so that the object returned by :func:`tempfile.NamedTemporaryFile` can be used to iterate over the contents of the file.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Added :func:`tempfile._TemporaryFileWrapper.__next__` so that the object returned by :func:`tempfile.NamedTemporaryFile` can be used to iterate over the contents of the file.