remove variable that aren't used.

theano/sandbox/cuda/opt.py

@@ -106,7 +106,7 @@ class InputToGpuOptimizer(Optimizer):
                 if new_input.type == input.type:
                     fgraph.replace_validate(input, new_input,
                                          "InputToGpuOptimizer")
-            except TypeError, e:
+            except TypeError:
                 #as we currently only support float32, this can fail.
                 #Using try except make that we won't need
                 pass