Merge pull request #3626 from sieben/comparisons_with_None

theano/compile/tests/test_function_module.py

@@ -556,7 +556,7 @@ class T_function(unittest.TestCase):
 
         for key, val in iteritems(func.fn.storage_map):
             if not isinstance(key, theano.gof.Constant):
-                assert (val[0] == None)
+                assert (val[0] is None)
 
 
 class T_picklefunction(unittest.TestCase):

theano/scan_module/scan.py

@@ -919,7 +919,7 @@ def scan(fn,
     givens.update(OrderedDict(izip(other_scan_args, other_inner_args)))
 
     if strict:
-        non_seqs_set = set(non_sequences if non_sequences != None else [])
+        non_seqs_set = set(non_sequences if non_sequences is not None else [])
 
         other_shared_scan_args = [arg.variable for arg
                             in dummy_f.maker.expanded_inputs

theano/tensor/signal/tests/test_downsample.py

@@ -781,7 +781,7 @@ class TestDownsampleFactorMax(utt.InferShapeTester):
         for i, maxpoolshp in enumerate(maxpoolshps):
             for j, ignore_border in enumerate([True, False]):
                 for k, padding in enumerate([(0,0), (1,1), (1,2)]):
-                    if out_shapes[k][i][j] == None:
+                    if out_shapes[k][i][j] is None:
                         continue
                     # checking shapes generated by DownsampleFactorMax
                     self._compile_and_check([image],