Fix lint warnings

IPython/core/interactiveshell.py

@@ -2078,7 +2078,7 b' class InteractiveShell(SingletonConfigurable):'
         try:
             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

@@ -452,6 +452,7 b' class InteractiveShellTestCase(unittest.TestCase):'
     @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):
             values.append(value)
             if value == chr(0xD8FF):