multiplexer: Fix code style.

avocado/core/tree.py

@@ -242,6 +242,7 @@ def create_from_yaml(input_yaml):
     data = read_ordered_yaml(input_yaml)
     return create_from_ordered_data(data)
 
+
 def path_parent(path):
     """
     From a given path, return its parent path.
@@ -254,6 +255,7 @@ def path_parent(path):
         return ''
     return parent
 
+
 def apply_filters(tree, filter_only=[], filter_out=[]):
     """
     Apply a set of filters to the tree.

selftests/all/unit/avocado/multiplexer_unittest.py

@@ -195,12 +195,12 @@ class TestMultiplex(unittest.TestCase):
 
     def test_multiplex_filter_out_0(self):
         f_out = ['']
-        leaves= apply_filters(self.tree3, filter_out=f_out).get_leaves()
+        leaves = apply_filters(self.tree3, filter_out=f_out).get_leaves()
         self.assertEqual(len(list(multiplex(leaves))), 8)
 
     def test_multiplex_filter_out_1(self):
         f_out = ['/arch']
-        leaves= apply_filters(self.tree3, filter_out=f_out).get_leaves()
+        leaves = apply_filters(self.tree3, filter_out=f_out).get_leaves()
         self.assertEqual(len(list(multiplex(leaves))), 4)
 
     def test_multiplex_filter_out_2(self):