diff --git a/common/lib/xmodule/xmodule/modulestore/tests/test_libraries.py b/common/lib/xmodule/xmodule/modulestore/tests/test_libraries.py
index 03ee84ae35..7381692239 100644
--- a/common/lib/xmodule/xmodule/modulestore/tests/test_libraries.py
+++ b/common/lib/xmodule/xmodule/modulestore/tests/test_libraries.py
@@ -13,7 +13,6 @@ from xmodule.modulestore.tests.factories import LibraryFactory, ItemFactory, che
 from xmodule.modulestore.tests.utils import MixedSplitTestCase
 
 
-
 @ddt.ddt
 class TestLibraries(MixedSplitTestCase):
     """
diff --git a/common/lib/xmodule/xmodule/tests/test_library_content.py b/common/lib/xmodule/xmodule/tests/test_library_content.py
index 50046ba9e0..f8d45f640d 100644
--- a/common/lib/xmodule/xmodule/tests/test_library_content.py
+++ b/common/lib/xmodule/xmodule/tests/test_library_content.py
@@ -24,7 +24,7 @@ from xmodule.tests import get_test_system
 from xmodule.validation import StudioValidationMessage
 
 
-dummy_render = lambda block, _: Fragment(block.data)
+dummy_render = lambda block, _: Fragment(block.data)  # pylint: disable=invalid-name
 
 
 class BaseTestLibraryContainer(MixedSplitTestCase):
diff --git a/common/lib/xmodule/xmodule/tests/test_library_root.py b/common/lib/xmodule/xmodule/tests/test_library_root.py
index a3ea602496..8774e7bb32 100644
--- a/common/lib/xmodule/xmodule/tests/test_library_root.py
+++ b/common/lib/xmodule/xmodule/tests/test_library_root.py
@@ -11,7 +11,7 @@ from xmodule.x_module import AUTHOR_VIEW
 from xmodule.modulestore.tests.factories import LibraryFactory, ItemFactory
 from xmodule.modulestore.tests.utils import MixedSplitTestCase
 
-dummy_render = lambda block, _: Fragment(block.data)
+dummy_render = lambda block, _: Fragment(block.data)  # pylint: disable=invalid-name
 
 
 @patch('xmodule.modulestore.split_mongo.caching_descriptor_system.CachingDescriptorSystem.render', VanillaRuntime.render)
@@ -62,7 +62,7 @@ class TestLibraryRoot(MixedSplitTestCase):
                 user_id=self.user_id,
                 publish_item=False,
                 modulestore=self.store,
-                data="HtmlBlock"+str(i)
+                data="HtmlBlock" + str(i)
             )
             for i in range(5)
         ]