diff --git a/funlib/persistence/__init__.py b/funlib/persistence/__init__.py
index 5060c32..9c534da 100644
--- a/funlib/persistence/__init__.py
+++ b/funlib/persistence/__init__.py
@@ -1,4 +1,4 @@
 from .arrays import Array, open_ds, prepare_ds  # noqa
 
 __version__ = "0.1.0"
-__version_info__ = tuple(int(i) for i in __version__.split("."))
\ No newline at end of file
+__version_info__ = tuple(int(i) for i in __version__.split("."))
diff --git a/funlib/persistence/graphs/__init__.py b/funlib/persistence/graphs/__init__.py
index cad8f5e..c30d7c0 100644
--- a/funlib/persistence/graphs/__init__.py
+++ b/funlib/persistence/graphs/__init__.py
@@ -1,2 +1,2 @@
 from .file_graph_provider import FileGraphProvider  # noqa
-from .mongodb_graph_provider import MongoDbGraphProvider  # noqa
\ No newline at end of file
+from .mongodb_graph_provider import MongoDbGraphProvider  # noqa
diff --git a/funlib/persistence/graphs/file_graph_provider.py b/funlib/persistence/graphs/file_graph_provider.py
index 9087427..fcde59f 100644
--- a/funlib/persistence/graphs/file_graph_provider.py
+++ b/funlib/persistence/graphs/file_graph_provider.py
@@ -424,7 +424,9 @@ def write_edges(
         if fail_if_exists:
             raise NotImplementedError("Fail if exists not implemented for file backend")
         if fail_if_not_exists:
-            raise NotImplementedError("Fail if not exists not implemented for file backend")
+            raise NotImplementedError(
+                "Fail if not exists not implemented for file backend"
+            )
         if attributes is not None:
             raise NotImplementedError("Attributes not implemented for file backend")
         if self.graph_provider.mode == "r":
@@ -477,9 +479,13 @@ def write_nodes(
         if delete:
             raise NotImplementedError("Delete not implemented for file backend")
         if fail_if_exists:
-            raise NotImplementedError("Fail if exists not implemented for " "file backend")
+            raise NotImplementedError(
+                "Fail if exists not implemented for " "file backend"
+            )
         if fail_if_not_exists:
-            raise NotImplementedError("Fail if not exists not implemented for " "file backend")
+            raise NotImplementedError(
+                "Fail if not exists not implemented for " "file backend"
+            )
         if attributes is not None:
             raise NotImplementedError("Attributes not implemented for file backend")
         if self.graph_provider.mode == "r":
diff --git a/funlib/persistence/graphs/shared_graph_provider.py b/funlib/persistence/graphs/shared_graph_provider.py
index 83ed7ac..22e7d79 100644
--- a/funlib/persistence/graphs/shared_graph_provider.py
+++ b/funlib/persistence/graphs/shared_graph_provider.py
@@ -103,4 +103,3 @@ def get_connected_components(self):
 
     def name(self):
         return type(self).__name__
-
diff --git a/tests/conftest.py b/tests/conftest.py
index c4d1393..342b1d0 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -50,4 +50,3 @@ def file_provider_factory(mode, directed=None, total_roi=None):
         mongo_client.drop_database("test_mongo_graph")
     else:
         yield file_provider_factory
-
diff --git a/tests/test_graph.py b/tests/test_graph.py
index 1cff02e..136faf1 100644
--- a/tests/test_graph.py
+++ b/tests/test_graph.py
@@ -31,7 +31,7 @@ def test_graph_filtering(provider_factory):
     filtered_edge_endpoints = [(edge["u"], edge["v"]) for edge in filtered_edges]
     expected_edge_endpoints = [(57, 23), (2, 42)]
     for u, v in expected_edge_endpoints:
-        assert (u,v) in filtered_edge_endpoints or (v,u) in filtered_edge_endpoints
+        assert (u, v) in filtered_edge_endpoints or (v, u) in filtered_edge_endpoints
 
     filtered_subgraph = graph_reader.get_graph(
         roi, nodes_filter={"selected": True}, edges_filter={"selected": True}
@@ -42,7 +42,10 @@ def test_graph_filtering(provider_factory):
     assert expected_node_ids == nodes_with_position
     assert len(filtered_subgraph.edges()) == len(expected_edge_endpoints)
     for u, v in expected_edge_endpoints:
-        assert (u,v) in filtered_subgraph.edges() or (v,u) in filtered_subgraph.edges()
+        assert (u, v) in filtered_subgraph.edges() or (
+            v,
+            u,
+        ) in filtered_subgraph.edges()
 
 
 def test_graph_filtering_complex(provider_factory):
@@ -77,7 +80,7 @@ def test_graph_filtering_complex(provider_factory):
     filtered_edge_endpoints = [(edge["u"], edge["v"]) for edge in filtered_edges]
     expected_edge_endpoints = [(57, 23)]
     for u, v in expected_edge_endpoints:
-        assert (u,v) in filtered_edge_endpoints or (v,u) in filtered_edge_endpoints
+        assert (u, v) in filtered_edge_endpoints or (v, u) in filtered_edge_endpoints
 
     filtered_subgraph = graph_provider.get_graph(
         roi,
@@ -90,7 +93,10 @@ def test_graph_filtering_complex(provider_factory):
     assert expected_node_ids == nodes_with_position
     assert len(filtered_subgraph.edges()) == len(expected_edge_endpoints)
     for u, v in expected_edge_endpoints:
-        assert (u,v) in filtered_subgraph.edges() or (v,u) in filtered_subgraph.edges()
+        assert (u, v) in filtered_subgraph.edges() or (
+            v,
+            u,
+        ) in filtered_subgraph.edges()
 
 
 def test_graph_read_and_update_specific_attrs(provider_factory):