Remove old /dev/null setup.

This probably existed for Python 2, but a shortcut as added in Python 3.

Author: QuLogic

jupyter_console/ptshell.py

@@ -975,24 +975,21 @@ def handle_image_stream(self, data, mime):
         imageformat = self._imagemime[mime]
         fmt = dict(format=imageformat)
         args = [s.format(**fmt) for s in self.stream_image_handler]
-        with open(os.devnull, 'w') as devnull:
-            proc = subprocess.Popen(
-                args, stdin=subprocess.PIPE,
-                stdout=devnull, stderr=devnull)
+        with subprocess.Popen(args, stdin=subprocess.PIPE,
+                              stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) as proc:
             proc.communicate(raw)
-        return (proc.returncode == 0)
+            return (proc.returncode == 0)
 
     def handle_image_tempfile(self, data, mime):
         raw = base64.decodebytes(data[mime].encode('ascii'))
         imageformat = self._imagemime[mime]
         filename = 'tmp.{0}'.format(imageformat)
-        with NamedFileInTemporaryDirectory(filename) as f, \
-                open(os.devnull, 'w') as devnull:
+        with NamedFileInTemporaryDirectory(filename) as f:
             f.write(raw)
             f.flush()
             fmt = dict(file=f.name, format=imageformat)
             args = [s.format(**fmt) for s in self.tempfile_image_handler]
-            rc = subprocess.call(args, stdout=devnull, stderr=devnull)
+            rc = subprocess.call(args, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
         return (rc == 0)
 
     def handle_image_callable(self, data, mime):