Close internal fp when closing and deleting

Tests/test_file_psd.py

@@ -17,6 +17,12 @@ def test_sanity(self):
         im2 = hopper()
         self.assert_image_similar(im, im2, 4.8)
 
+    def test_unclosed_file(self):
+        def open():
+            im = Image.open(test_file)
+            im.load()
+        self.assert_warning(None, open)
+
     def test_invalid_file(self):
         invalid_file = "Tests/images/flower.jpg"
 

src/PIL/PsdImagePlugin.py

@@ -127,7 +127,7 @@ def _open(self):
         self.tile = _maketile(self.fp, mode, (0, 0) + self.size, channels)
 
         # keep the file open
-        self._fp = self.fp
+        self.__fp = self.fp
         self.frame = 1
         self._min_frame = 1
 
@@ -149,7 +149,7 @@ def seek(self, layer):
             self.mode = mode
             self.tile = tile
             self.frame = layer
-            self.fp = self._fp
+            self.fp = self.__fp
             return name, bbox
         except IndexError:
             raise EOFError("no such layer")
@@ -167,6 +167,15 @@ def load_prepare(self):
         if self.mode == "P":
             Image.Image.load(self)
 
+    def _close__fp(self):
+        try:
+            if self.__fp != self.fp:
+                self.__fp.close()
+        except AttributeError:
+            pass
+        finally:
+            self.__fp = None
+
 
 def _layerinfo(file):
     # read layerinfo block