Fixed flake8 errors.

theano/tensor/opt.py

@@ -3411,7 +3411,7 @@ def local_rebroadcast_lift(node):
             # and input (after elemwise operation) to new output, because an
             # error in the new graph could have been caused by either of the
             # two ops.
-            copy_stack_trace(node.outputs+node.inputs, rval)
+            copy_stack_trace(node.outputs + node.inputs, rval)
 
             return rval
     if inode and isinstance(inode.op, T.Rebroadcast):
@@ -3427,7 +3427,7 @@ def local_rebroadcast_lift(node):
         # and from previous input (after first rebroadcast op) because an error in
         # the new graph could have been caused by either of the two
         # rebroadcast ops.
-        copy_stack_trace(node.outputs+node.inputs, rval)
+        copy_stack_trace(node.outputs + node.inputs, rval)
         return rval
 
 
@@ -3633,7 +3633,7 @@ def local_useless_switch(node):
             ret = T.fill(cond, node.inputs[1])
 
             # Copy over stacktrace from switch output and correct branch
-            copy_stack_trace(node.outputs+node.inputs[1], ret)
+            copy_stack_trace(node.outputs + node.inputs[1], ret)
             return [ret]
 
         # This case happens with scan.
@@ -3709,7 +3709,7 @@ def local_mul_switch_sink(node):
                     #  elementwise multiplication op and previous switch op,
                     # because an error in this part can be caused by either
                     # of the two previous ops.
-                    copy_stack_trace(node.outputs+switch.outputs, fct)
+                    copy_stack_trace(node.outputs + switch.outputs, fct)
                     return fct
             except NotScalarConstantError:
                 pass
@@ -3733,7 +3733,7 @@ def local_mul_switch_sink(node):
                     # elementwise multiplication op and previous switch op,
                     # because an error in this part can be caused by either
                     # of the two previous ops.
-                    copy_stack_trace(node.outputs+switch.outputs, fct)
+                    copy_stack_trace(node.outputs + switch.outputs, fct)
                     return fct
             except NotScalarConstantError:
                 pass
@@ -3777,7 +3777,7 @@ def local_div_switch_sink(node):
                 # elementwise division op and previous switch op,
                 # because an error in this part can be caused by either
                 # of the two previous ops.
-                copy_stack_trace(node.outputs+switch.outputs, fct)
+                copy_stack_trace(node.outputs + switch.outputs, fct)
                 return fct
         except NotScalarConstantError:
             pass
@@ -3799,7 +3799,7 @@ def local_div_switch_sink(node):
                 # elementwise division op and previous switch op,
                 # because an error in this part can be caused by either
                 # of the two previous ops.
-                copy_stack_trace(node.outputs+switch.outputs, fct)                
+                copy_stack_trace(node.outputs + switch.outputs, fct)
                 return fct
         except NotScalarConstantError:
             pass
@@ -3843,7 +3843,7 @@ def local_useless_tile(node):
                         ret = node.inputs[0].dimshuffle(broad)
                         # Copy over stacktrace from previous output node,
                         # and from node before tiling operation.
-                        copy_stack_trace(node.outputs+node.inputs[0], ret)
+                        copy_stack_trace(node.outputs + node.inputs[0], ret)
                         return [ret]
                 except ValueError:
                     return