== None to is None

IPython/core/tests/test_formatters.py

@@ -352,7 +352,7 b' def test_print_method_weird():'
     with capture_output() as captured:
         result = f(call_hat)
 
-    assert result == None
+    assert result is None
 
     class BadReprArgs(object):
         def _repr_html_(self, extra, args):

IPython/lib/tests/test_latextools.py

@@ -25,7 +25,7 b' def test_check_latex_to_png_dvipng_fails_when_no_cmd(command):'
             raise FindCmdError
 
     with patch.object(latextools, "find_cmd", mock_find_cmd):
-        assert latextools.latex_to_png_dvipng("whatever", True) == None
+        assert latextools.latex_to_png_dvipng("whatever", True) is None
 
 
 @contextmanager