Fix lint warnings

IPython/core/interactiveshell.py

@@ -2076,9 +2076,9 b' class InteractiveShell(SingletonConfigurable):'
         """
         val = self.InteractiveTB.stb2text(stb)
         try:
-           print(val)
+            print(val)
         except UnicodeEncodeError:
-           print(val.encode('utf-8', 'backslashreplace').decode())
+            print(val.encode('utf-8', 'backslashreplace').decode())
 
     def showsyntaxerror(self, filename=None, running_compiled_code=False):
         """Display the syntax error that just occurred.

IPython/core/tests/test_interactiveshell.py

@@ -449,23 +449,23 b' class InteractiveShellTestCase(unittest.TestCase):'
             # Reset the custom exception hook
             ip.set_custom_exc((), None)
     
-    @mock.patch('builtins.print')
+    @mock.patch("builtins.print")
     def test_showtraceback_with_surrogates(self, mocked_print):
         values = []
-        def mock_print_func(value, sep=' ', end='\n', file=sys.stdout, flush=False):
+        def mock_print_func(value, sep=" ", end="\n", file=sys.stdout, flush=False):
             values.append(value)
-            if value == chr(0xd8ff):
-                raise UnicodeEncodeError("utf-8", chr(0xd8ff), 0, 1, "")
+            if value == chr(0xD8FF):
+                raise UnicodeEncodeError("utf-8", chr(0xD8FF), 0, 1, "")
 
         # mock builtins.print
         mocked_print.side_effect = mock_print_func
 
-        # ip._showtraceback() is replaced in globalipapp.py. 
+        # ip._showtraceback() is replaced in globalipapp.py.
         # Call original method to test.
-        interactiveshell.InteractiveShell._showtraceback(ip, None, None, chr(0xd8ff))
+        interactiveshell.InteractiveShell._showtraceback(ip, None, None, chr(0xD8FF))
         
         self.assertEqual(mocked_print.call_count, 2)
-        self.assertEqual(values, [chr(0xd8ff), '\\ud8ff'])
+        self.assertEqual(values, [chr(0xD8FF), "\\ud8ff"])
 
     def test_mktempfile(self):
         filename = ip.mktempfile()