Fix handling of pathlib in save. Fixes #1460

PIL/Image.py

@@ -1620,13 +1620,17 @@ class Image(object):
         """
 
         filename = ""
+        open_fp = False
         if isPath(fp):
             filename = fp
+            open_fp=True
         elif sys.version_info >= (3, 4):
             from pathlib import Path
             if isinstance(fp, Path):
                 filename = str(fp.resolve())
+                open_fp=True
         elif hasattr(fp, "name") and isPath(fp.name):
+            # only set the name for metadata purposes
             filename = fp.name
 
         # may mutate self!
@@ -1655,17 +1659,14 @@ class Image(object):
         else:
             save_handler = SAVE[format.upper()]
 
-        if filename:
+        if open_fp:
             fp = builtins.open(filename, "wb")
-            close = 1
-        else:
-            close = 0
 
         try:
             save_handler(self, fp, filename)
         finally:
             # do what we can to clean up
-            if close:
+            if open_fp:
                 fp.close()
 
     def seek(self, frame):

Tests/test_image.py

@@ -57,6 +57,17 @@ class TestImage(PillowTestCase):
         self.assertEqual(im.mode, "RGB")
         self.assertEqual(im.size, (128, 128))
 
+    def test_tempfile(self):
+        # see #1460, pathlib support breaks tempfile.TemporaryFile on py27
+        # Will error out on save on 3.0.0
+        import tempfile
+        im = hopper()
+        fp = tempfile.TemporaryFile()
+        im.save(fp, 'JPEG')
+        fp.seek(0)
+        reloaded = Image.open(fp)
+        self.assert_image_similar(im, reloaded, 20)
+
     def test_internals(self):
 
         im = Image.new("L", (100, 100))