diff --git a/flatland/envs/rail_generators.py b/flatland/envs/rail_generators.py
index d915fdc772753320027ace408040594a66fe7daa..1b72b9788dcf67028fbf5deea7a3f2a7e1cfa1e6 100644
--- a/flatland/envs/rail_generators.py
+++ b/flatland/envs/rail_generators.py
@@ -581,7 +581,6 @@ def sparse_rail_generator(num_cities=5, num_intersections=4, num_trainstations=2
             to_close = True
             tries = 0
 
-
             if not realistic_mode:
                 while to_close:
                     x_tmp = node_radius + np.random.randint(height - node_radius)
diff --git a/flatland/envs/schedule_generators.py b/flatland/envs/schedule_generators.py
index 8d1a04d094e78903156d554b297703e7078941be..ee80320bc5eb03f8568e38fa876f5cf18818c999 100644
--- a/flatland/envs/schedule_generators.py
+++ b/flatland/envs/schedule_generators.py
@@ -194,7 +194,8 @@ def random_schedule_generator(speed_ratio_map: Mapping[float, float] = None) ->
 
                 if len(valid_starting_directions) == 0:
                     update_agents[i] = 1
-                    warnings.warn("reset position for agent[{}]: {} -> {}".format(i, agents_position[i], agents_target[i]))
+                    warnings.warn(
+                        "reset position for agent[{}]: {} -> {}".format(i, agents_position[i], agents_target[i]))
                     re_generate = True
                     break
                 else:
@@ -229,7 +230,6 @@ def schedule_from_file(filename) -> ScheduleGenerator:
         # agents are always reset as not moving
         agents_static = [EnvAgentStatic(d[0], d[1], d[2], d[3], d[4], d[5]) for d in data["agents_static"]]
 
-
         # setup with loaded data
         agents_position = [a.position for a in agents_static]
         agents_direction = [a.direction for a in agents_static]
@@ -239,4 +239,3 @@ def schedule_from_file(filename) -> ScheduleGenerator:
         return agents_position, agents_direction, agents_target, agents_speed, agents_malfunction
 
     return generator
-
diff --git a/flatland/evaluators/client.py b/flatland/evaluators/client.py
index f2dac1c8705a651e2a7be026b4bd82a961efbbdd..92f1a49d777552b2108aff3963aa5c1bc84fdbfc 100644
--- a/flatland/evaluators/client.py
+++ b/flatland/evaluators/client.py
@@ -254,14 +254,12 @@ class FlatlandRemoteClient(object):
 if __name__ == "__main__":
     remote_client = FlatlandRemoteClient()
 
-
     def my_controller(obs, _env):
         _action = {}
         for _idx, _ in enumerate(_env.agents):
             _action[_idx] = np.random.randint(0, 5)
         return _action
 
-
     my_observation_builder = TreeObsForRailEnv(max_depth=3,
                                                predictor=ShortestPathPredictorForRailEnv())
 
diff --git a/flatland/utils/simple_rail.py b/flatland/utils/simple_rail.py
index 67bd93dd35c8f53ef3cdef23dbae0f0d785b9a64..f9f1009d5ba796b628069a4de3f61ce983eba9b7 100644
--- a/flatland/utils/simple_rail.py
+++ b/flatland/utils/simple_rail.py
@@ -81,6 +81,7 @@ def make_simple_rail2() -> Tuple[GridTransitionMap, np.array]:
     rail.grid = rail_map
     return rail, rail_map
 
+
 def make_simple_rail_unconnected() -> Tuple[GridTransitionMap, np.array]:
     # We instantiate a very simple rail network on a 7x10 grid:
     # Note that that cells have invalid RailEnvTransitions!
@@ -107,9 +108,9 @@ def make_simple_rail_unconnected() -> Tuple[GridTransitionMap, np.array]:
     simple_switch_east_west_south = transitions.rotate_transition(simple_switch_north_left, 270)
     rail_map = np.array(
         [[empty] * 3 + [dead_end_from_south] + [empty] * 6] +
-        [[empty] * 3 + [vertical_straight] + [empty] * 6]  +
-        [[empty] * 3 + [dead_end_from_north] + [empty] * 6]  +
-        [[dead_end_from_east] + [horizontal_straight]  * 5 + [simple_switch_east_west_south] +
+        [[empty] * 3 + [vertical_straight] + [empty] * 6] +
+        [[empty] * 3 + [dead_end_from_north] + [empty] * 6] +
+        [[dead_end_from_east] + [horizontal_straight] * 5 + [simple_switch_east_west_south] +
          [horizontal_straight] * 2 + [dead_end_from_west]] +
         [[empty] * 6 + [vertical_straight] + [empty] * 3] * 2 +
         [[empty] * 6 + [dead_end_from_north] + [empty] * 3], dtype=np.uint16)
diff --git a/tests/test_flatland_core_transition_map.py b/tests/test_flatland_core_transition_map.py
index 8812c847e61d81f6614f37d26489b4c17ea7fd14..1137b8816973c12601029543c221810c9acd157c 100644
--- a/tests/test_flatland_core_transition_map.py
+++ b/tests/test_flatland_core_transition_map.py
@@ -116,18 +116,18 @@ def test_path_exists(rendering=False):
     check_path(
         env,
         rail,
-        (1,3),  # east dead-end
+        (1, 3),  # east dead-end
         2,  # south
-        (3,3),  # north dead-end
+        (3, 3),  # north dead-end
         True
     )
 
     check_path(
         env,
         rail,
-        (1,3),  # east dead-end
+        (1, 3),  # east dead-end
         0,  # north
-        (3,3),  # north dead-end
+        (3, 3),  # north dead-end
         True
     )