Fix flake8 problems

theano/tensor/tests/test_blas.py

@@ -443,6 +443,7 @@ This test suite ensures that Gemm is inserted where it belongs, and
 that the resulting functions compute the same things as the originals.
 """
 
+
 def XYZab():
     return T.matrix(), T.matrix(), T.matrix(), T.scalar(), T.scalar()
 

theano/tensor/tests/test_opt.py

@@ -4685,7 +4685,7 @@ class T_local_switch_sink(unittest.TestCase):
         """
         Wrapper around theano.function for this test.
 
-        It disables checking for NaN removed by optimizations in DebugMode 
+        It disables checking for NaN removed by optimizations in DebugMode
         (it has false positives in that case).
         """
         f = theano.function(*args, **kwargs)

theano/tests/test_rop.py

@@ -29,6 +29,7 @@ Special Op created to test what happens when you have one op that is not
 differentiable in the computational graph
 '''
 
+
 class BreakRop(Op):
     """
     @note: Non-differentiable.